| BPA supply accounts (pipeline/config/crosswalks/bpa_customer.csv and supply_accounts.csv) ↗Notice and licenceLicence: Curation CC0; workbook values are read from BPA's public-domain files at the cell each row names, and quoted figures cite their document and page | assertion: utility x kind (customer_link, product, rhwm, chwm, net_requirement, above_rhwm, cdq, purchase_cost, purchased_energy, disclosed_bpa_energy) x component (Block | Slice, or the whole) x period | reported; modeled for net_requirement and above_rhwm · curatedEntitlements (MWa), demand quantities (kW), forecasts net of resources (MWa), dollars (USD), energy received (MWh, or MWa as an average) and a disclosure attribution (MWh), each with its own period and document, never added, subtracted or divided across one another. A figure names the BPA product in force during its period; a price per MWh appears only where the utility publishes the same period's BPA energy in MWh in the same document, badged derived. A note's Block and Slice rows are components of the year's purchase, never products, never added to its total and never priced. The bill trace quotes the utility's residential sheet and prints a price only where the utility does, in its unit; the share of a bill that pays for BPA power is shown only where a document states it. |
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| Final RHWM process outputs for the FY 2026-2028 rate period (published 2024-10-01): Table 2 RHWMs (sheet RHWM) and Table 3 Above-RHWM Load Service (sheet AboveRHWMLoad), one row per preference customer keyed by BES id ↗Notice and licenceLicence: Work of the U.S. Government, not subject to copyright (17 U.S.C. § 105); BPA's site states no other terms | Not declared | reported · directBPA's Rate Period High Water Mark for each preference customer for FY 2026-2028 (October 2025 to September 2028), with the customer's Regional Dialogue Contract High Water Mark as used that rate period, its forecast total retail load less new large single loads and existing resources for each fiscal year, and the load BPA forecast above the RHWM. Average megawatts (aMW, the atlas's MWa): the sheet labels its resource column aMW (RHWM!M3) and forms the others from it by subtraction. An RHWM caps how much power a customer may buy at the Tier 1 rate; it is not a delivery, a purchase or a bill, and the forecasts are BPA's of 2024, not measurements. |
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| Provider of Choice FY 2026 Contract High Water Mark Calculation, final CHWMs (released 2026-05-28, Info!C4): sheet Calculation, one row per customer keyed by BES id, "Note: All data is in aMW" (Calculation!B5) ↗Notice and licenceLicence: Work of the U.S. Government, not subject to copyright (17 U.S.C. § 105); BPA's site states no other terms | Not declared | reported · directBPA's one-time FY 2026 calculation of each customer's Provider of Choice Contract High Water Mark, in aMW (Calculation!B5), for contracts delivering power from October 1, 2028. BPA published the final CHWMs on 2026-05-28 after declining the one dispute filed (Wells Rural Electric, 2026-05-14), and states it will not revisit the calculation once final CHWMs are published, though CHWMs may be adjusted in later rate periods under the contracts (CHWM Implementation Policy, 2025-08-14, pages 2-3). A CHWM is a maximum eligibility to buy at the Tier 1 rate over a future contract period, not a current delivery right and not a purchase. |
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| Final Contract Demand Quantities in kW (Sheet1!D1), effective 2026-05-01 (Sheet1!D2), one row per Regional Dialogue customer keyed by BES id and one column per month October to September, with the product code and 21 notes on annexations and product conversions ↗Notice and licenceLicence: Work of the U.S. Government, not subject to copyright (17 U.S.C. § 105); BPA's site states no other terms | Not declared | reported · directContract Demand Quantities in kilowatts by month, as BPA revised them effective 2026-05-01: a demand amount in each customer's Regional Dialogue contract, one per month of the year, not a measured peak, not energy and not a purchase. Twelve monthly kW values are never added together. Note 19 of the sheet records Snohomish, Emerald and Clark PUDs converting from Slice/Block to Load Following on October 1, 2025. |
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| Load Following customers' measured FY2024 and FY2025 total retail load (energy MWh and customer system peak) and dedicated resources by month, prepared 2026-07-23 and published by July 31 under Section 17 of the Load Following CHWM contracts ↗Notice and licenceLicence: Work of the U.S. Government, not subject to copyright (17 U.S.C. § 105); BPA's site states no other terms | Not declared | reported · directMeasured data for the customers Section 17 of the Load Following CHWM contracts covers, for the two previous fiscal years; it carries no forecast. The atlas reads its customer column only, to record which customers it does not list. |
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| Regional Dialogue Long-Term (20 year) Contracts, Customer Products List dated 2022-12-30 (PDF, 4 pages): each customer's product ↗Notice and licenceLicence: Work of the U.S. Government, not subject to copyright (17 U.S.C. § 105); BPA's site states no other terms | Not declared | reported · curatedThe product each Regional Dialogue customer bought on the list's date, as BPA printed it. The list writes Slice for customers on the Slice/Block product. |
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| Regional Dialogue Long-Term (20 year) Contracts, Customer Products List dated 2025-10-01 (PDF, 4 pages): each customer's product ↗Notice and licenceLicence: Work of the U.S. Government, not subject to copyright (17 U.S.C. § 105); BPA's site states no other terms | Not declared | reported · curatedThe product each Regional Dialogue customer bought on the list's date, as BPA printed it. |
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| Letter from BPA's Vice President, NW Requirements Marketing, to regional customers, 2024-08-19 (PDF, 1 page): BPA allows Emerald, Clark and Snohomish PUDs to change from Slice/Block to Load Following effective 2025-10-01 ↗Notice and licenceLicence: Work of the U.S. Government, not subject to copyright (17 U.S.C. § 105); BPA's site states no other terms | Not declared | reported · curatedBPA's decision on three customers' requests to change their Regional Dialogue purchase obligation from the Slice/Block product to the Load Following product, effective October 1, 2025. |
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| 2025 Annual Report (PDF, 76 pages, created 2026-04-10): Management's Discussion and Analysis (unaudited) and the audited combined financial statements and notes for the years ended December 31, 2025 and 2024 ↗Notice and licenceLicence: Annual report of a Washington public utility district, a public record (RCW 42.56); snopud.com states no reuse terms for it | Not declared | reported · curatedThe utility's own account of its calendar years. The BPA purchase dollars are from Management's Discussion and Analysis, which the report marks unaudited, rounded there to the million; the audited statements carry purchased power in total, not by supplier. The report gives BPA's share of its energy only as approximate percentages and no BPA megawatt-hours for the same years, so no price per MWh is derived. |
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| Financial Statements as of and for the Years Ended December 31, 2016 and 2015, with Required Supplementary Information, Other Information and the Independent Auditors' Report (PDF, 88 pages, created 2017-05-01); at seattle.gov by its address, not linked from the current publication pagesNotice and licenceLicence: Financial statements of a department of the City of Seattle, a public record (RCW 42.56); seattle.gov's terms of use grant no reuse of its documents | Not declared | reported · curatedThe utility's own account of calendar years 2016 and 2015. Note 18's table (page 69) prints the Bonneville Block and Bonneville Slice rows above their subtotal, Long-term purchase power—Bonneville, in dollars and average megawatts; the unaudited Historical Energy Resources table (page 83) gives BPA energy in MWh. The note ties Residential Exchange billing credits to both agreements (page 68) without placing them in or out of the Bonneville row. |
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| Financial Statements as of and for the Years Ended December 31, 2018 and 2017, with Required Supplementary Information, Other Information and the Independent Auditors' Report (PDF, 93 pages, created 2019-05-20); at seattle.gov by its address, not linked from the current publication pagesNotice and licenceLicence: Financial statements of a department of the City of Seattle, a public record (RCW 42.56); seattle.gov's terms of use grant no reuse of its documents | Not declared | reported · curatedThe utility's own account of calendar years 2018 and 2017. Note 19's table (page 74) prints the Bonneville Block and Bonneville Slice rows above their subtotal, Long-term purchased power-Bonneville (Slice printed as a dash for 2018, after the Department stopped buying Slice on October 1, 2017); the unaudited Historical Energy Resources table (page 88) gives BPA energy in MWh. The note ties Residential Exchange billing credits to both agreements (page 73), and the unaudited Management's Discussion ties Slice true-up credits to the Bonneville cost (pages 15 and 16). |
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| Official Statement dated June 29, 2021 for the Municipal Light and Power Improvement and Refunding Revenue Bonds, 2021, Series A, with its addendum (PDF, 317 pages); Appendix C is the Department's audited 2020 Financial Statements (years ended December 31, 2020 and 2019), PDF pages 205-306; at seattle.gov by its address, not linked from the current investor-relations pageNotice and licenceLicence: Official statement of the City of Seattle, whose Appendix C reprints City Light's audited statements, a public record (RCW 42.56); seattle.gov's terms of use grant no reuse of its documents | Not declared | reported · curatedThe 2020 statements as the official statement reprints them, for calendar years 2020 and 2019. Note 19's table (page 78 of the statements) gives the Bonneville row in dollars and average megawatts; the unaudited Historical Energy Resources table (page 90) gives BPA energy in MWh and heads its 2019 column '2019(d)': '(d) Certain numbers were corrected in 2020.' Only Appendix C is read; the official statement's own tables are not used. |
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| Financial Statements as of and for the Years Ended December 31, 2022 and 2021, with Required Supplementary Information, Other Information and the Independent Auditors' Report (PDF, 104 pages, created 2023-05-05) ↗Notice and licenceLicence: Financial statements of a department of the City of Seattle, a public record (RCW 42.56); seattle.gov's terms of use grant no reuse of its documents | Not declared | reported · curatedThe utility's own account of calendar years 2022 and 2021. Note 20's table (page 83) gives the Bonneville row in dollars and average megawatts; the unaudited Historical Energy Resources table (page 97, printed as an image) gives BPA energy in MWh. The unaudited Management's Discussion ties the 2022 fall in long-term purchased power mostly to BPA's Power Reserves Distribution Clause credit (page 20). |
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| Financial Statements as of and for the Years Ended December 31, 2024 and 2023, with Required Supplementary Information, Other Information and the Independent Auditors' Report (PDF, 102 pages, created 2025-05-02) ↗Notice and licenceLicence: Financial statements of a department of the City of Seattle, a public record (RCW 42.56); seattle.gov's terms of use grant no reuse of its documents | Not declared | reported · curatedThe utility's own account of calendar years 2024 and 2023; the atlas reads 2023 from it (2024 is read from the 2025 statements, which print the same figures). Note 20's table (page 81, printed as an image) gives the Bonneville row in dollars and average megawatts; the unaudited Historical Energy Resources table (page 95, an image) gives BPA energy in MWh. The unaudited Management's Discussion ties the 2023 rise in long-term purchased power to a reduced BPA Power Reserves Distribution Clause credit (page 21). |
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| Financial Statements as of and for the Years Ended December 31, 2025 and 2024, with Required Supplementary Information, Other Information and the Independent Auditors' Report (PDF, 99 pages, created 2026-04-30) ↗Notice and licenceLicence: Financial statements of a department of the City of Seattle, a public record (RCW 42.56); seattle.gov's terms of use grant no reuse of its documents | Not declared | reported · curatedThe utility's own account of its calendar years. Its BPA dollars and its BPA energy as an average in MWa are in the audited Note 20; its BPA energy in MWh is in the unaudited Other Information. The operating statement's 'Long-term purchased power—Bonneville and other' (page 26) adds other suppliers to BPA and is not used. |
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| Official Statement dated June 23, 2026 for the Municipal Light and Power Improvement and Refunding Revenue Bonds, Series 2026A (PDF, 240 pages) ↗Notice and licenceLicence: Official statement of the City of Seattle, a public record (RCW 42.56); seattle.gov's terms of use grant no reuse of its documents | Not declared | reported · curatedThe City's offering document for City Light's 2026A bonds. The atlas reads one passage (page B-28): the next Power Sales Agreement with BPA, under the Provider of Choice policy, runs October 1, 2028 through September 30, 2044, and City Light has elected BPA's Slice/Block product for its term. Its BPA dollar and energy tables (pages B-21 to B-22) are not mixed with the statements': its BPA dollars are net of the South Fork Tolt billing credit, and its 2022 MWh differs from the statements'. |
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| Fuel Mix Disclosure CY2024, Utility Fuel Mix by Fuel Category extract (sheet Report Extract, run 2025-12-10) ↗Notice and licenceLicence: Washington public record (RCW 42.56) prepared for the Legislature; Commerce's conditions of use state no reuse grant | Not declared | reported · directEach retail supplier's Washington sales for the report year by fuel category in MWh and share, as Commerce computed them from declared resources, the BPA system mix and unspecified purchases, which have been their own category since CY2018 (RCW 19.29A.060 and .140). Multi-state utilities appear as their Washington share; product rows (green programs) sit beside their utilities. Shares are of retail sales including line losses, not of generation; a disclosed mix is not a plant-level emissions accounting and not a compliance finding. |
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