{
  "editionDate": "2026-10-05",
  "introduction": "Electricity makes a useful UES case study because it connects science, everyday bills, industrial history and decisions about public space. The central question is simple: how do we provide useful energy, at the right place and time, without making reliability, cost or environmental burdens somebody else’s problem? The answer is a system. Generators, transmission lines, neighborhood equipment, storage, building design and human habits all matter. El Segundo offers a particularly tangible starting point: a coastal power station, homes and apartments with different roof rights, commercial buildings and a community that can learn by measuring before committing to construction.",
  "sections": [
    {
      "id": "story-1",
      "title": "Start with two units",
      "lens": "FOUNDATIONS",
      "paragraphs": [
        {
          "text": "Power is the rate at which energy moves. A kilowatt, or kW, measures power; a kilowatt-hour, or kWh, measures energy. A hypothetical 1 kW appliance operating continuously for three hours uses 3 kWh. A 10-watt lamp used for 100 hours also uses 1 kWh. Actual appliances cycle and change settings, so their labels alone do not establish annual consumption.",
          "sources": []
        },
        {
          "text": "The same distinction applies to batteries. A hypothetical 5 kW / 10 kWh battery has an output limit and an energy capacity. Ignoring losses and reserve settings, 10 kWh could supply a steady 1 kW load for ten hours, but it could not supply a 7 kW load through a 5 kW inverter. A solar array’s nameplate kW describes a test-condition rating, not continuous production.",
          "sources": [
            "S05",
            "S04"
          ]
        }
      ]
    },
    {
      "id": "story-2",
      "title": "How a discovery became infrastructure",
      "lens": "FOUNDATIONS",
      "paragraphs": [
        {
          "text": "Electricity existed long before people could control it. The story of electrification is a chain of discoveries and practical systems, rather than the work of one inventor. Volta’s 1800 battery supplied sustained current. Faraday’s 1831 induction experiments showed how changing magnetism could produce electricity. Generators and motors turned that relationship into useful machines.",
          "sources": []
        },
        {
          "text": "In 1882, Edison’s Pearl Street station demonstrated central electricity service using direct current. Alternating-current systems and transformers later made voltage conversion and long-distance networks practical. Electricity gradually became an interconnected service rather than a collection of isolated machines.",
          "sources": [
            "S01",
            "S03"
          ]
        },
        {
          "text": "A second route arrived through semiconductors. Bell Telephone researchers developed a practical photovoltaic cell in 1954. Solar cells convert light directly into electricity, with no turbine. Today’s rooftop panel shares that basic principle with early solar devices, although manufacturing, materials and electronics have changed enormously.",
          "sources": [
            "S31"
          ]
        },
        {
          "text": "For a learning exhibit, use safe objects: a small battery, a hand-crank generator, an old utility bill, a photograph of an early lamp and a miniature solar module. Ask what each solved and what infrastructure it still needed. These are teaching ideas, not instructions to recreate historic high-voltage experiments.",
          "sources": []
        }
      ]
    },
    {
      "id": "story-3",
      "title": "The family of generation methods",
      "lens": "FOUNDATIONS",
      "paragraphs": [
        {
          "text": "Most large generators use motion and magnetism. Steam, falling water, wind or combustion gases turn equipment connected to a generator. A combined-cycle gas plant uses a gas turbine and recovers exhaust heat to run a steam cycle. Nuclear fission and geothermal heat can also provide the heat needed for power production. Solar photovoltaics use a different route: light interacting with a semiconductor.",
          "sources": [
            "S02",
            "S31"
          ]
        },
        {
          "text": "Each technology brings a different set of strengths and constraints:",
          "sources": []
        },
        {
          "text": "- Natural gas can provide controllable output, but requires fuel and produces carbon dioxide and air pollutants.\n- Coal can provide sustained output, with substantial combustion emissions and ash-management burdens.\n- Nuclear delivers substantial steady output with low operating greenhouse-gas emissions; projects must address capital cost, safety, spent fuel and long development schedules.\n- Wind and solar have no purchased fuel, but their production follows weather and time, requiring complementary resources and networks.\n- Hydropower can offer flexibility where reservoirs allow it; water availability and river impacts constrain operation.\n- Geothermal can supply relatively steady power, but suitable resources, drilling and project risk matter.\n- Biomass and waste-to-energy consume physical feedstocks and produce emissions; “renewable” does not mean impact-free.",
          "sources": [
            "S02",
            "S34",
            "S13",
            "S17"
          ]
        },
        {
          "text": "Choosing a mix requires comparing services as well as annual energy. A resource available during an evening shortage can have a different value from one producing during a sunny surplus.",
          "sources": []
        }
      ]
    },
    {
      "id": "story-4",
      "title": "What supplies electricity today",
      "lens": "FOUNDATIONS",
      "paragraphs": [
        {
          "text": "EIA’s preliminary 2025 figures put U.S. utility-scale net generation at about 4,429 TWh. Rounded shares were natural gas 41%, coal 17%, nuclear 18% and renewables 24%; small categories and rounding limit precision. Small-scale solar added an estimated 93.15 TWh outside that utility-scale total. These are energy shares, not shares of installed capacity.",
          "sources": [
            "S05"
          ]
        },
        {
          "text": "California’s accounting needs a different label. The California Energy Commission’s 2024 total-system dataset includes utility-scale in-state generation plus net imports. It reports 278,338 GWh: natural gas 34.01%, solar 21.30%, wind 11.89%, large hydro 11.06%, nuclear 9.92%, geothermal 4.60%, with other resources completing the mix. Its 62.23% “non-GHG and renewable” grouping follows the agency’s classification. Behind-the-meter rooftop solar is outside this table’s principal accounting boundary.",
          "sources": [
            "S06"
          ]
        },
        {
          "text": "Neither dataset describes the exact electrons arriving at one outlet. Annual state generation, a utility’s procurement portfolio and the grid’s hourly supply mix answer different questions. A responsible chart labels all three boundaries: geography, time and what is counted.",
          "sources": []
        }
      ]
    },
    {
      "id": "story-5",
      "title": "The grid’s daily balancing act",
      "lens": "THE SYSTEM TODAY",
      "paragraphs": [
        {
          "text": "High-voltage transmission carries bulk electricity; substations and distribution equipment deliver it locally at usable voltages. Operators must balance supply and demand while managing equipment limits and disturbances. A plant can exist but be unable to deliver all its output across a congested line. A region can have adequate generation while a damaged neighborhood circuit still causes an outage.",
          "sources": [
            "S03"
          ]
        },
        {
          "text": "Storage moves energy through time and consumes some energy in the process. Batteries are well suited to fast response; pumped storage uses water moved between elevations. Power rating, duration, efficiency, location and state of charge determine what either can do. A four-hour storage system should not be described as protection against an indefinite shortage.",
          "sources": [
            "S04"
          ]
        },
        {
          "text": "California illustrates the timing problem: strong solar production changes midday net demand, while evening needs persist after sunlight fades. CAISO’s 2026 summer assessment reported more than 16,000 MW of battery additions since 2020. It found sufficient resources across a broad modeled range, while identifying extreme regional heat and wildfire as continuing risks. That was a planning assessment, not proof that every summer hour or local circuit would be trouble-free.",
          "sources": [
            "S10"
          ]
        }
      ]
    },
    {
      "id": "story-6",
      "title": "Why the bill is not the power plant’s cost",
      "lens": "THE SYSTEM TODAY",
      "paragraphs": [
        {
          "text": "Four numbers are often confused. Capital expenditure is the upfront cost to build equipment, commonly expressed in dollars per kW. Levelized cost of energy, or LCOE, spreads modeled lifetime costs over modeled electricity production. Wholesale prices describe transactions for electricity in particular markets, places and times. Retail bills include the customer’s tariff, delivery and other applicable charges.",
          "sources": []
        },
        {
          "text": "The National Laboratory of the Rockies, formerly NREL, publishes the Annual Technology Baseline to make technology and financing assumptions explicit. Resource quality, construction cost, operating life and the cost of capital change the result. LCOE alone does not price every grid upgrade, backup service or difference in the timing of output. A technology league table without those assumptions can mislead.",
          "sources": [
            "S08",
            "S09"
          ]
        },
        {
          "text": "For a grounded retail comparison, EIA’s July 2026 preliminary residential averages were 18.31 cents/kWh nationally and 33.61 cents/kWh in California, published September 24. These are aggregate revenue-per-sales statistics, not a quote for an El Segundo account. Multiplying 500 kWh by either average illustrates scale, not an actual bill: approximately $91.55 versus $168.05.",
          "sources": [
            "S07"
          ]
        },
        {
          "text": "SCE’s residential bill structure changed in November 2025. Its current explainer describes an approximately $24 monthly Base Services Charge for standard customers, about $6 for CARE and $12 for FERA or qualifying deed-restricted affordable housing. Actual tariffs and billing days control; solar customers still face applicable fixed charges. Lower consumption remains useful, but eliminating purchased kWh does not automatically eliminate a bill.",
          "sources": [
            "S30"
          ]
        }
      ]
    },
    {
      "id": "story-7",
      "title": "More electricity can serve more needs",
      "lens": "THE SYSTEM TODAY",
      "paragraphs": [
        {
          "text": "Electrification moves some transportation and heating demand onto the electricity system. This can increase electrical consumption while reducing the total energy required for a service. Heat-pump water heaters, for example, move heat rather than producing all of it through resistance heating. Their actual savings depend on equipment, weather, building condition and the fuel being replaced. Efficiency and electrification should be assessed together.",
          "sources": [
            "S33"
          ]
        },
        {
          "text": "Data centers add a different challenge: large, concentrated loads and uncertain growth. IEA’s 2026 update estimates global data-center consumption at 485 TWh in 2025 and projects roughly 950 TWh in 2030. Those figures cover data centers broadly, not AI alone.",
          "sources": [
            "S11"
          ]
        },
        {
          "text": "Berkeley Lab’s June 2026 report, titled the “2025 Update,” projects U.S. data-center use of 649 TWh in its 2030 reference case, or 11.8% of projected national electricity. Its compounded uncertainty range is 521–843 TWh. These are model scenarios, not a guaranteed forecast or a statistical confidence interval. Equipment shipments, utilization and other assumptions materially affect the result.",
          "sources": [
            "S12"
          ]
        },
        {
          "text": "The practical planning question is where new loads arrive, when they operate, how flexible they are and who pays for necessary upgrades. National totals cannot answer those local questions by themselves.",
          "sources": []
        }
      ]
    },
    {
      "id": "story-8",
      "title": "Innovations worth watching",
      "lens": "THE SYSTEM TODAY",
      "paragraphs": [
        {
          "text": "Some useful advances are already in operation; others remain demonstrations or research. Treat maturity as part of every claim.",
          "sources": []
        },
        {
          "text": "Grid-enhancing technologies include dynamic line ratings and power-flow controls. They can use measurements and operating conditions to make better use of existing wires, although they do not remove every need for new transmission.",
          "sources": [
            "S15"
          ]
        },
        {
          "text": "Virtual power plants coordinate distributed equipment such as batteries and flexible loads. Their value depends on dependable participation, customer controls, communications and compensation, not simply on connecting devices to an app.",
          "sources": [
            "S16"
          ]
        },
        {
          "text": "Enhanced geothermal systems seek to extend usable underground heat beyond naturally favorable reservoirs. Drilling performance and responsible reservoir management are central to whether projects scale economically.",
          "sources": [
            "S13"
          ]
        },
        {
          "text": "Perovskite and tandem photovoltaics aim to capture more of the solar spectrum. Laboratory efficiency records do not establish the lifetime performance of mass-produced rooftop modules; durability and reproducible manufacturing remain crucial.",
          "sources": [
            "S14"
          ]
        },
        {
          "text": "Advanced nuclear designs may offer new sizes and operating characteristics, but first-of-a-kind cost, licensing, fuel supply and construction performance must be demonstrated. Existing nuclear generation and a proposed reactor are different evidence categories. Longer-duration storage likewise deserves attention, but a pilot’s nameplate rating is not proof of affordable, dependable deployment at regional scale.",
          "sources": [
            "S17",
            "S04"
          ]
        }
      ]
    },
    {
      "id": "story-9",
      "title": "El Segundo makes the system visible",
      "lens": "THE SYSTEM TODAY",
      "paragraphs": [
        {
          "text": "The El Segundo Energy Center is an immediate local example. The Energy Commission lists an operational, nominal 560 MW natural-gas combined-cycle facility at 301 Vista Del Mar Boulevard, commercially operating since August 2013. Its redevelopment included fast-start units and air cooling. Those choices illustrate a real tradeoff: dispatchable generation and reduced dependence on ocean cooling alongside continued fossil-fuel combustion.",
          "sources": [
            "S18"
          ]
        },
        {
          "text": "A useful public learning walk could observe energy infrastructure from legal public viewpoints and discuss generation, water, land and transmission. It would not enter restricted property, imply a plant tour is available or claim the station supplies only El Segundo. Photographing a transformer label or opening electrical equipment is unnecessary; published diagrams and public records are safer teaching materials.",
          "sources": []
        },
        {
          "text": "The city announced SolarAPP+ online permitting for qualifying single-family rooftop installations in June 2023. A separate city page still uses pilot-program wording. The sensible next step for a real project is to confirm the current pathway with Building and Safety, rather than promise instantaneous approval for every roof or battery. Permitting and utility interconnection are separate checks.",
          "sources": [
            "S19",
            "S20"
          ]
        }
      ]
    },
    {
      "id": "story-10",
      "title": "Solar choices depend on who controls the roof",
      "lens": "THE SYSTEM TODAY",
      "paragraphs": [
        {
          "text": "A homeowner can investigate roof condition, shading, structural suitability, electricity-use timing and ownership or financing. A renter usually cannot authorize a permanent installation. Apartment projects need owner participation, a suitable meter arrangement and a clear explanation of who receives the savings. Multifamily affordable housing may have a SOMAH pathway, subject to property eligibility and available funding.",
          "sources": [
            "S25"
          ]
        },
        {
          "text": "A business can investigate roofs or parking canopies alongside operating hours and demand charges. A public-space project adds ownership, accessibility, maintenance, safety and procurement questions. Solar on a community building does not automatically create bill credits for nearby households or an emergency shelter.",
          "sources": []
        },
        {
          "text": "For people without roof access, SCE’s Community Renewables program lists operating projects and uses a separate developer agreement plus utility bill credits. Enrollment capacity, account eligibility, net savings and cancellation terms need checking. Its Green Rate page currently says enrollments are constrained and a waitlist applies. Nearby Clean Power Alliance offerings should not be assumed available: El Segundo is absent from the member-community lists reviewed. These findings identify research routes, not recommendations to sign a contract.",
          "sources": [
            "S27",
            "S26",
            "S28"
          ]
        }
      ]
    },
    {
      "id": "story-11",
      "title": "The solar rules that change the arithmetic",
      "lens": "LOCAL CHOICES",
      "paragraphs": [
        {
          "text": "California’s net billing framework generally applies to new interconnection applications from April 15, 2023. Legacy net-metering customers can have different rules. Under SCE’s Solar Billing Plan, imported electricity and exported solar energy are valued separately; export credits vary with time. Self-consumption and thoughtfully sized storage can therefore matter more than maximizing annual exports. Residential SBP customers use TOU-D-PRIME.",
          "sources": [
            "S22",
            "S21"
          ]
        },
        {
          "text": "Do not automatically subtract a 30% federal household tax credit from a new 2026 proposal. IRS guidance says the section 25D residential clean-energy credit is unavailable for expenditures after December 31, 2025. Business-owned and developer-owned projects use different rules; eligibility requires current, project-specific tax review.",
          "sources": [
            "S23",
            "S35"
          ]
        },
        {
          "text": "California’s SGIP includes a Residential Solar and Storage Equity program for qualifying low-income households. Program criteria, reservation status, required participation and actual available budgets matter. A listed incentive is not an award, and this guide has not verified any household’s eligibility.",
          "sources": [
            "S24"
          ]
        }
      ]
    },
    {
      "id": "story-12",
      "title": "A transparent solar thought experiment",
      "lens": "LOCAL CHOICES",
      "paragraphs": [
        {
          "text": "Assume an owner-controlled roof, a 5 kW array and an illustrative 1,500 kWh per kW annual yield: 7,500 kWh/year. This yield is an input, not an El Segundo roof assessment. NLR’s PVWatts can help estimate production using location and system assumptions; shading, orientation, equipment and weather still need scrutiny.",
          "sources": [
            "S29"
          ]
        },
        {
          "text": "Suppose installed cash cost is $18,000, avoided variable imports are worth $0.35/kWh, exports average $0.05/kWh and annual maintenance is $150. These are invented round-number assumptions, not SCE tariff rates or a market quote. At 40% self-consumption, the first-year modeled net benefit is $1,125 and simple payback is 16 years. At 70%, it is $1,800 and 10 years. The change shows why matching production and use matters.",
          "sources": []
        },
        {
          "text": "This simplified calculation excludes financing, degradation, replacement, changing tariffs and the time value of money. Fixed charges remain. A battery must add its own cost, losses and replacement assumptions; increasing a self-consumption slider does not make a battery free. Real evaluation needs interval consumption and production estimates, not just an annual electricity total.",
          "sources": []
        }
      ]
    },
    {
      "id": "story-13",
      "title": "Turn the case study into community learning",
      "lens": "LOCAL CHOICES",
      "paragraphs": [
        {
          "text": "Start with a voluntary learning audit: compare appliance labels, measure safe plug-in loads within a meter’s rating and chart anonymous example bills. Keep private account data private. Use low-voltage classroom kits for generation demonstrations. Portable batteries can support appropriately rated individual devices; they must not backfeed a building outlet. Permanent solar, storage and building connections require suitable permissions and qualified installation. Ordinary grid-tied solar generally disconnects during an outage; backup requires equipment designed for safe islanding, and a battery alone does not establish that capability.",
          "sources": [
            "S32"
          ]
        },
        {
          "text": "Three proposed UES projects follow naturally. First, an energy-literacy workshop can teach units, tariff reading and load timing. Second, a renter and landlord research group can compare verified community-solar and multifamily pathways. Third, a public-site feasibility study can examine one willing host’s shade canopy, modest learning display or professionally designed resilience concept. None is an approved city project, an installation commitment or a claim of available funding.",
          "sources": []
        },
        {
          "text": "Proposed intern research roles could include source checking, historical-object research, accessible data visualization and supervised site-feasibility analysis. These are learning assignments, not advertised jobs. Each should finish with an inspectable result: a corrected source card, a reproducible calculation or a clearly bounded recommendation.",
          "sources": []
        },
        {
          "text": "The strongest local next step is small and measurable: establish the need, test assumptions, identify who decides and only then consider equipment. Electricity’s future will be built from both new technologies and better decisions about the systems already around us.",
          "sources": []
        }
      ]
    }
  ],
  "timeline": [
    {
      "year": "1800",
      "title": "Sustained current",
      "text": "Volta’s battery supports repeatable experiments.",
      "source_ids": [
        "S01"
      ],
      "sources": [
        "S01"
      ]
    },
    {
      "year": "1831",
      "title": "Induction",
      "text": "Faraday connects changing magnetism with electricity.",
      "source_ids": [
        "S01"
      ],
      "sources": [
        "S01"
      ]
    },
    {
      "year": "1882",
      "title": "Central service",
      "text": "Pearl Street demonstrates an early DC electricity network.",
      "source_ids": [
        "S01"
      ],
      "sources": [
        "S01"
      ]
    },
    {
      "year": "1954",
      "title": "Practical silicon PV",
      "text": "Bell Telephone researchers demonstrate a practical photovoltaic cell.",
      "source_ids": [
        "S31"
      ],
      "sources": [
        "S31"
      ]
    },
    {
      "year": "2013",
      "title": "El Segundo redevelopment",
      "text": "The current Energy Center begins commercial operation.",
      "source_ids": [
        "S18"
      ],
      "sources": [
        "S18"
      ]
    },
    {
      "year": "2023",
      "title": "New solar accounting",
      "text": "California moves new applications to net billing; El Segundo announces online solar permitting.",
      "source_ids": [
        "S19",
        "S22"
      ],
      "sources": [
        "S19",
        "S22"
      ]
    },
    {
      "year": "2025–26",
      "title": "A changing household equation",
      "text": "SCE restructures bills; household federal solar-credit availability changes.",
      "source_ids": [
        "S23",
        "S30"
      ],
      "sources": [
        "S23",
        "S30"
      ]
    },
    {
      "year": "2030",
      "title": "Planning horizon",
      "text": "Data-center scenarios emphasize growth and uncertainty, not inevitability.",
      "source_ids": [
        "S11",
        "S12"
      ],
      "sources": [
        "S11",
        "S12"
      ]
    }
  ],
  "sources": [
    {
      "id": "S01",
      "title": "EIA electricity history timeline",
      "url": "https://www.eia.gov/kids/history-of-energy/timelines/electricity.php",
      "reference_period": "Historical milestones",
      "supports": "Battery, induction and early central stations.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "eia.gov",
      "period": "Historical milestones",
      "note": "Battery, induction and early central stations.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S02",
      "title": "EIA how electricity is generated",
      "url": "https://www.eia.gov/energyexplained/electricity/how-electricity-is-generated.php",
      "reference_period": "Technology explainer",
      "supports": "Generators, turbines, combined cycles and PV.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "eia.gov",
      "period": "Technology explainer",
      "note": "Generators, turbines, combined cycles and PV.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S03",
      "title": "EIA delivery to consumers",
      "url": "https://www.eia.gov/energyexplained/electricity/delivery-to-consumers.php",
      "reference_period": "Technology explainer",
      "supports": "Transmission, distribution and interconnected grids.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "eia.gov",
      "period": "Technology explainer",
      "note": "Transmission, distribution and interconnected grids.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S04",
      "title": "EIA energy storage for electricity generation",
      "url": "https://www.eia.gov/energyexplained/electricity/energy-storage-for-electricity-generation.php",
      "reference_period": "Technology explainer",
      "supports": "Storage technologies and operational distinctions.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "eia.gov",
      "period": "Technology explainer",
      "note": "Storage technologies and operational distinctions.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S05",
      "title": "EIA generation capacity and sales",
      "url": "https://www.eia.gov/energyexplained/electricity/electricity-in-the-us-generation-capacity-and-sales.php",
      "reference_period": "2025 preliminary annual estimates",
      "supports": "Utility-scale 4,429 TWh; small-scale PV 93.15 TWh; rounded generation shares.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "eia.gov",
      "period": "2025 preliminary annual estimates",
      "note": "Utility-scale 4,429 TWh; small-scale PV 93.15 TWh; rounded generation shares.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S06",
      "title": "CEC 2024 total system electric generation",
      "url": "https://www.energy.ca.gov/data-reports/energy-almanac/california-electricity-data/2024-total-system-electric-generation",
      "reference_period": "Calendar 2024",
      "supports": "In-state utility-scale generation plus net imports; rooftop boundary differs.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "energy.ca.gov",
      "period": "Calendar 2024",
      "note": "In-state utility-scale generation plus net imports; rooftop boundary differs.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S07",
      "title": "EIA Electric Power Monthly table 5.6.A",
      "url": "https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=epmt_5_6_a",
      "reference_period": "July 2026; published September 24, 2026; preliminary",
      "supports": "Residential retail averages, not SCE tariffs; live URL changes monthly.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "eia.gov",
      "period": "July 2026; published September 24, 2026; preliminary",
      "note": "Residential retail averages, not SCE tariffs; live URL changes monthly.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S08",
      "title": "NLR ATB financial cases and methods",
      "url": "https://atb.nlr.gov/electricity/2025/financial_cases_%26_methods",
      "reference_period": "2025 ATB edition",
      "supports": "Financing assumptions and LCOE.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "atb.nlr.gov",
      "period": "2025 ATB edition",
      "note": "Financing assumptions and LCOE.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S09",
      "title": "NLR ATB approach and methodology",
      "url": "https://atb.nlr.gov/electricity/2025/approach_%26_methodology",
      "reference_period": "2025 ATB edition",
      "supports": "Technology cost/performance model boundaries; not local quotes.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "atb.nlr.gov",
      "period": "2025 ATB edition",
      "note": "Technology cost/performance model boundaries; not local quotes.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S10",
      "title": "CAISO 2026 summer assessment",
      "url": "https://www.caiso.com/generation-transmission/resource-adequacy/2026-summer-loads-and-resources-assessment",
      "reference_period": "2026 forward-looking summer planning assessment",
      "supports": "Battery additions and reliability modeling; not observed summer outcome.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "caiso.com",
      "period": "2026 forward-looking summer planning assessment",
      "note": "Battery additions and reliability modeling; not observed summer outcome.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S11",
      "title": "IEA Key Questions on Energy and AI",
      "url": "https://www.iea.org/reports/key-questions-on-energy-and-ai/executive-summary",
      "reference_period": "2026 report; 2025 estimate and 2030 projection",
      "supports": "Global data-center 485 TWh to 950 TWh central projection; all data centers.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "iea.org",
      "period": "2026 report; 2025 estimate and 2030 projection",
      "note": "Global data-center 485 TWh to 950 TWh central projection; all data centers.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S12",
      "title": "Berkeley Lab US Data Center Energy Usage Report 2025 Update",
      "url": "https://www.energy.gov/documents/united-states-data-center-energy-usage-report-2025-update",
      "reference_period": "Published June 2026; 2030 model scenarios",
      "supports": "649 TWh reference case; 521–843 TWh compounded uncertainty, not a confidence interval.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "energy.gov",
      "period": "Published June 2026; 2030 model scenarios",
      "note": "649 TWh reference case; 521–843 TWh compounded uncertainty, not a confidence interval.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S13",
      "title": "DOE enhanced geothermal systems",
      "url": "https://www.energy.gov/hgeo/geothermal/enhanced-geothermal-systems",
      "reference_period": "Technology explainer",
      "supports": "Enhanced geothermal principles and development.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "energy.gov",
      "period": "Technology explainer",
      "note": "Enhanced geothermal principles and development.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S14",
      "title": "DOE perovskite research directions",
      "url": "https://www.energy.gov/cmei/systems/perovskite-research-directions",
      "reference_period": "Research overview",
      "supports": "Tandem potential, durability and manufacturing gaps.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "energy.gov",
      "period": "Research overview",
      "note": "Tandem potential, durability and manufacturing gaps.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S15",
      "title": "DOE grid enhancing technologies",
      "url": "https://www.energy.gov/oe/grid-enhancing-technologies-improve-existing-power-lines",
      "reference_period": "Technology and demonstration overview",
      "supports": "Dynamic line ratings and power-flow controls.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "energy.gov",
      "period": "Technology and demonstration overview",
      "note": "Dynamic line ratings and power-flow controls.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S16",
      "title": "DOE virtual power plants projects",
      "url": "https://www.energy.gov/edf/virtual-power-plants-projects",
      "reference_period": "Program and technology overview",
      "supports": "Coordination of distributed energy resources.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "energy.gov",
      "period": "Program and technology overview",
      "note": "Coordination of distributed energy resources.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S17",
      "title": "DOE advantages and challenges of nuclear-powered data centers",
      "url": "https://www.energy.gov/ne/articles/advantages-and-challenges-nuclear-powered-data-centers",
      "reference_period": "Technology overview",
      "supports": "First-of-a-kind expense, fuel, siting and spent fuel.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "energy.gov",
      "period": "Technology overview",
      "note": "First-of-a-kind expense, fuel, siting and spent fuel.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S18",
      "title": "CEC El Segundo Energy Center",
      "url": "https://www.energy.ca.gov/powerplant/combined-cycle/el-segundo-energy-center",
      "reference_period": "Facility record; commercial operation August 1, 2013",
      "supports": "560 MW nominal natural-gas combined cycle; operational listing and air-cooling redevelopment.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "energy.ca.gov",
      "period": "Facility record; commercial operation August 1, 2013",
      "note": "560 MW nominal natural-gas combined cycle; operational listing and air-cooling redevelopment.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S19",
      "title": "El Segundo online building and solar permitting launch",
      "url": "https://www.elsegundo.gov/Home/Components/News/News/2945/",
      "reference_period": "June 15, 2023 announcement",
      "supports": "SolarAPP+ launch for qualifying single-family rooftop solar.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "elsegundo.gov",
      "period": "June 15, 2023 announcement",
      "note": "SolarAPP+ launch for qualifying single-family rooftop solar.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S20",
      "title": "El Segundo automated residential solar permitting",
      "url": "https://www.elsegundo.gov/government/departments/community-development/building-and-safety-division/automated-residential-solar-permitting",
      "reference_period": "Current page retains pilot wording",
      "supports": "Conflicts in maturity wording with later launch notice; verify project route.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "elsegundo.gov",
      "period": "Current page retains pilot wording",
      "note": "Conflicts in maturity wording with later launch notice; verify project route.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S21",
      "title": "SCE Solar Billing Plan",
      "url": "https://www.sce.com/save-money/rates-financing/solar-billing-plan",
      "reference_period": "Current billing explainer; 2026 export examples",
      "supports": "Import/export distinction and TOU-D-PRIME; hourly schedules govern, no flat guaranteed export rate.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "sce.com",
      "period": "Current billing explainer; 2026 export examples",
      "note": "Import/export distinction and TOU-D-PRIME; hourly schedules govern, no flat guaranteed export rate.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S22",
      "title": "CPUC net energy metering and net billing",
      "url": "https://www.cpuc.ca.gov/industries-and-topics/electrical-energy/demand-side-management/customer-generation/net-energy-metering-and-net-billing",
      "reference_period": "Current rule explainer; April 15, 2023 transition",
      "supports": "New NBT applications and distinction from legacy NEM.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "cpuc.ca.gov",
      "period": "Current rule explainer; April 15, 2023 transition",
      "note": "New NBT applications and distinction from legacy NEM.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S23",
      "title": "IRS energy credit termination FAQ",
      "url": "https://www.irs.gov/newsroom/faqs-for-modification-of-sections-25c-25d-25e-30c-30d-45l-45w-and-179d-under-public-law-119-21-139-stat-72-july-4-2025-commonly-known-as-the-one-big-beautiful-bill-obbb",
      "reference_period": "FS-2025-05 August 21, 2025; reviewed October 5, 2026",
      "supports": "25D unavailable for expenditures after December 31, 2025; individual tax advice excluded.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "irs.gov",
      "period": "FS-2025-05 August 21, 2025; reviewed October 5, 2026",
      "note": "25D unavailable for expenditures after December 31, 2025; individual tax advice excluded.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S24",
      "title": "CPUC Self-Generation Incentive Program",
      "url": "https://www.cpuc.ca.gov/industries-and-topics/electrical-energy/demand-side-management/self-generation-incentive-program",
      "reference_period": "Current program overview",
      "supports": "Residential Solar and Storage Equity; dynamic funding availability not independently established.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "cpuc.ca.gov",
      "period": "Current program overview",
      "note": "Residential Solar and Storage Equity; dynamic funding availability not independently established.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S25",
      "title": "CPUC Solar on Multifamily Affordable Housing",
      "url": "https://www.cpuc.ca.gov/industries-and-topics/electrical-energy/demand-side-management/customer-generation/somah",
      "reference_period": "Program overview; page includes older dollar amounts",
      "supports": "Affordable-housing route; do not reuse older amounts as current awards.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "cpuc.ca.gov",
      "period": "Program overview; page includes older dollar amounts",
      "note": "Affordable-housing route; do not reuse older amounts as current awards.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S26",
      "title": "SCE Green Rate",
      "url": "https://www.sce.com/save-money/rates-financing/residential-rate-plans/tiered-rate-plan/green-rates",
      "reference_period": "Current enrollment-status page",
      "supports": "Waitlist/no new enrollment stated; page mixes dated price examples so no price promises.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "sce.com",
      "period": "Current enrollment-status page",
      "note": "Waitlist/no new enrollment stated; page mixes dated price examples so no price promises.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S27",
      "title": "SCE Community Renewables",
      "url": "https://www.sce.com/clean-energy-efficiency/efficiency-at-home/community-renewables-program",
      "reference_period": "Current project list and 2026 forecast context",
      "supports": "Operating projects and developer-contract structure; live capacity/eligibility not checked.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "sce.com",
      "period": "Current project list and 2026 forecast context",
      "note": "Operating projects and developer-contract structure; live capacity/eligibility not checked.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S28",
      "title": "Clean Power Alliance residential rates and communities",
      "url": "https://cleanpoweralliance.org/residential-rate/",
      "reference_period": "Current rates page, includes July 2026 schedules",
      "supports": "El Segundo absent from listed member communities; no local eligibility inferred.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "cleanpoweralliance.org",
      "period": "Current rates page, includes July 2026 schedules",
      "note": "El Segundo absent from listed member communities; no local eligibility inferred.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S29",
      "title": "NLR PVWatts calculator",
      "url": "https://pvwatts.nlr.gov/pvwatts.php/",
      "reference_period": "Current calculator",
      "supports": "Production modeling; no property-specific run performed.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "pvwatts.nlr.gov",
      "period": "Current calculator",
      "note": "Production modeling; no property-specific run performed.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S30",
      "title": "SCE Base Services Charge",
      "url": "https://www.sce.com/save-money/rates-financing/residential-rate-plans/bsc",
      "reference_period": "Billing structure introduced November 2025; current explainer",
      "supports": "Approximate $24 standard, $6 CARE, $12 FERA/qualifying affordable housing.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "sce.com",
      "period": "Billing structure introduced November 2025; current explainer",
      "note": "Approximate $24 standard, $6 CARE, $12 FERA/qualifying affordable housing.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S31",
      "title": "EIA photovoltaics and electricity",
      "url": "https://www.eia.gov/energyexplained/solar/photovoltaics-and-electricity.php",
      "reference_period": "Technology and historical explainer",
      "supports": "PV conversion, systems and 1954 practical cell.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "eia.gov",
      "period": "Technology and historical explainer",
      "note": "PV conversion, systems and 1954 practical cell.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S32",
      "title": "DOE distributed energy resources and microgrids",
      "url": "https://www.energy.gov/cmei/systems/solar-integration-distributed-energy-resources-and-microgrids-basics",
      "reference_period": "Technology and safety explainer",
      "supports": "Grid-tied solar disconnection and deliberately designed islanding for backup.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "energy.gov",
      "period": "Technology and safety explainer",
      "note": "Grid-tied solar disconnection and deliberately designed islanding for backup.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S33",
      "title": "DOE heat pump water heaters",
      "url": "https://bsesc.energy.gov/energy-basics/hvac-heat-pump-water-heaters",
      "reference_period": "Building science explainer",
      "supports": "Heat transfer and efficiency of heat-pump water heaters.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "bsesc.energy.gov",
      "period": "Building science explainer",
      "note": "Heat transfer and efficiency of heat-pump water heaters.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S34",
      "title": "EIA electricity and the environment",
      "url": "https://www.eia.gov/energyexplained/electricity/electricity-and-the-environment.php",
      "reference_period": "Technology overview last updated April 16, 2024",
      "supports": "Combustion pollution, waste and land impacts; old generation statistics deliberately not reused.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "eia.gov",
      "period": "Technology overview last updated April 16, 2024",
      "note": "Combustion pollution, waste and land impacts; old generation statistics deliberately not reused.",
      "retrieved": "2026-10-05"
    },
    {
      "id": "S35",
      "title": "IRS Form 3468 instructions",
      "url": "https://www.irs.gov/instructions/i3468",
      "reference_period": "2025 instructions with current legislative changes",
      "supports": "Business investment-credit framework differs from household 25D; no project eligibility determination.",
      "verified_on": "2026-10-05",
      "source_type": "primary",
      "publisher": "irs.gov",
      "period": "2025 instructions with current legislative changes",
      "note": "Business investment-credit framework differs from household 25D; no project eligibility determination.",
      "retrieved": "2026-10-05"
    }
  ],
  "charts": [
    {
      "id": "us-generation",
      "title": "US utility-scale generation in 2025",
      "kind": "bar",
      "unit": "percent",
      "period": "2025 preliminary",
      "geography": "United States",
      "values": [
        {
          "label": "Natural gas",
          "value": 41
        },
        {
          "label": "Coal",
          "value": 17
        },
        {
          "label": "Nuclear",
          "value": 18
        },
        {
          "label": "Renewables",
          "value": 24
        }
      ],
      "source_ids": [
        "S05"
      ],
      "caveat": "Rounded energy shares; small other sources are less than 1%. Excludes small-scale solar. Do not label as installed capacity."
    },
    {
      "id": "ca-generation",
      "title": "California total-system generation in 2024",
      "kind": "bar",
      "unit": "percent",
      "period": "2024",
      "geography": "California plus net imports",
      "values": [
        {
          "label": "Natural gas",
          "value": 34.01
        },
        {
          "label": "Solar",
          "value": 21.3
        },
        {
          "label": "Wind",
          "value": 11.89
        },
        {
          "label": "Hydro, large and small",
          "value": 12.58
        },
        {
          "label": "Nuclear",
          "value": 9.92
        },
        {
          "label": "Geothermal",
          "value": 4.6
        },
        {
          "label": "Biomass",
          "value": 1.94
        },
        {
          "label": "Coal, oil, other and unspecified",
          "value": 3.76
        }
      ],
      "source_ids": [
        "S06"
      ],
      "caveat": "Utility-scale generation plus net imports. Behind-the-meter PV outside the main table. Grouped rows calculated from CEC percentages."
    },
    {
      "id": "retail-price",
      "title": "Residential retail electricity averages",
      "kind": "bar",
      "unit": "US cents/kWh",
      "period": "July 2026 preliminary; released September 24, 2026",
      "values": [
        {
          "label": "United States",
          "value": 18.31
        },
        {
          "label": "California",
          "value": 33.61
        }
      ],
      "source_ids": [
        "S07"
      ],
      "caveat": "Aggregate averages, not an El Segundo tariff or an individual bill."
    },
    {
      "id": "ai-world",
      "title": "Global data-center electricity demand",
      "kind": "bar",
      "unit": "TWh/year",
      "values": [
        {
          "label": "2025 estimate",
          "value": 485
        },
        {
          "label": "2030 central projection",
          "value": 950
        }
      ],
      "source_ids": [
        "S11"
      ],
      "caveat": "IEA 2026 report; all data centers, not only AI; projected value is conditional."
    }
  ],
  "facts": [
    {
      "lens": "GLOBAL",
      "title": "Data centers, all uses",
      "value": "485 → 950 TWh",
      "text": "2025 estimate to conditional 2030 central projection. These totals cover all data centers, not only AI.",
      "sources": [
        "S11"
      ],
      "period": "IEA 2026 report; 2025 estimate / 2030 projection"
    },
    {
      "lens": "UNITED STATES",
      "title": "Utility-scale generation",
      "value": "4,429 TWh",
      "text": "Preliminary annual generation. Small-scale solar, estimated at 93.15 TWh, is outside this total. Generation is energy, not capacity.",
      "sources": [
        "S05"
      ],
      "period": "2025 preliminary"
    },
    {
      "lens": "CALIFORNIA",
      "title": "Total-system electricity",
      "value": "278,338 GWh",
      "text": "Utility-scale in-state generation plus net imports. The main table excludes behind-the-meter rooftop solar. A different year and boundary from the national figure.",
      "sources": [
        "S06"
      ],
      "period": "2024"
    },
    {
      "lens": "EL SEGUNDO",
      "title": "Energy Center",
      "value": "560 MW",
      "text": "CEC nominal capacity for the operational natural-gas combined-cycle facility, commercially operating since August 2013. It does not serve only El Segundo.",
      "sources": [
        "S18"
      ],
      "period": "CEC facility record; August 2013 operation date"
    }
  ],
  "scenarios": [
    {
      "type": "Renter",
      "title": "Start without roof rights",
      "text": "Understand your bill and safe plug-in loads; research actual community-renewables eligibility.",
      "conditions": "Landlord approval for permanent changes; SCE Green Rate is waitlisted.",
      "outcome": "A source-backed options brief with a no-build alternative.",
      "sources": [
        "S26",
        "S27"
      ]
    },
    {
      "type": "Homeowner",
      "title": "Study the roof and the load",
      "text": "Compare roof suitability, interval demand, solar-only and solar-plus-storage cases.",
      "conditions": "Permits, utility interconnection, fixed charges and current incentives.",
      "outcome": "A source-backed options brief with a no-build alternative.",
      "sources": [
        "S19",
        "S20",
        "S21",
        "S23"
      ]
    },
    {
      "type": "Multifamily owner",
      "title": "Follow the tenant benefit",
      "text": "Study metering, tenant benefit allocation and affordable-housing programs.",
      "conditions": "SOMAH is eligibility-dependent, with funding to verify.",
      "outcome": "A source-backed options brief with a no-build alternative.",
      "sources": [
        "S25"
      ]
    },
    {
      "type": "Business",
      "title": "Match power to operating hours",
      "text": "Review load timing, demand charges and roofs or parking canopies.",
      "conditions": "Site-specific engineering, permits, insurance, financing and tax review.",
      "outcome": "A source-backed options brief with a no-build alternative.",
      "sources": [
        "S09",
        "S35"
      ]
    },
    {
      "type": "Community or public site",
      "title": "A willing host, a bounded question",
      "text": "Begin a host-approved feasibility study or low-voltage educational demonstration.",
      "conditions": "No City authorization implied; ownership, accessibility and maintenance must be resolved.",
      "outcome": "A source-backed options brief with a no-build alternative.",
      "sources": [
        "S19",
        "S27"
      ]
    }
  ],
  "priceSources": [
    "S07",
    "S08",
    "S09",
    "S30"
  ],
  "creditSources": [
    "S23"
  ],
  "safetySources": [
    "S32"
  ],
  "safety": "Use low-voltage learning materials. Permanent generation, storage and building connections need permission, qualified installation, permits and utility interconnection. Never backfeed an outlet. Ordinary grid-tied solar generally disconnects in an outage; backup requires equipment designed for safe islanding.",
  "learningActivities": [
    {
      "title": "Measure one useful service",
      "time": "45 minutes",
      "activity": "Compare a labeled appliance estimate with a safely rated plug-in meter reading, without opening equipment.",
      "output": "kW, operating time and kWh worksheet"
    },
    {
      "title": "Read an example bill",
      "time": "45 minutes",
      "activity": "Use anonymized or invented data to separate usage, time-of-use prices, fixed charges and credits.",
      "output": "A clearly labeled bill diagram"
    },
    {
      "title": "Follow one source backward",
      "time": "30 minutes",
      "activity": "Check a statistic’s publication date, reference year, geography and measurement boundary.",
      "output": "A source card with one caveat"
    },
    {
      "title": "Solar sensitivity lab",
      "time": "60 minutes",
      "activity": "Change one calculator assumption at a time, keeping the others fixed.",
      "output": "Three reproducible cases and the largest uncertainty"
    },
    {
      "title": "Public-site study",
      "time": "Multi-session proposal",
      "activity": "With host permission, compare a learning display, shade canopy and professionally designed backup concept.",
      "output": "A feasibility brief with ownership, permissions, costs to investigate and a no-build option"
    }
  ],
  "proposedRoles": [
    {
      "title": "Energy source researcher",
      "deliverable": "Verify dated statistics and maintain source cards."
    },
    {
      "title": "Local history researcher",
      "deliverable": "Curate publicly available historical objects and facility records."
    },
    {
      "title": "Data visualization researcher",
      "deliverable": "Build accessible charts that retain units and boundaries."
    },
    {
      "title": "Community feasibility researcher",
      "deliverable": "Compare renter, owner and willing-host pathways under supervision."
    }
  ],
  "limitations": [
    "Statistics retain their own period and accounting boundary.",
    "Illustrative economics are not tariff simulations, site assessments or market quotes.",
    "SGIP/SOMAH budgets and project subscription availability have not been confirmed.",
    "Business/developer credits differ from household 25D; no eligibility determination made."
  ]
}