Bonneville and the frame, month by month

BPAT's own reported interchange with each directly interconnected authority, as a mean over the hours of the month it reported for that neighbour. Positive is net outflow from BPAT to the neighbour; negative is net inflow. The neighbour's report of the same boundary is a separate series and is not shown.

• Puget Sound EnergyPSEI · inside the frame 1,970 MWa out
• Portland General ElectricPGE · inside the frame 1,567 MWa out
• Los Angeles Department of Water and PowerLDWP · outside the frame 1,306 MWa out
• California Independent System OperatorCISO · outside the frame 1,110 MWa out
• PacifiCorp WestPACW · inside the frame 1,104 MWa out
• Seattle City LightSCL · inside the frame 708 MWa out
• Balancing Authority of Northern CaliforniaBANC · outside the frame 703 MWa out
• AvistaAVA · inside the frame 634 MWa out
• Tacoma PowerTPWR · inside the frame 347 MWa out
• Nevada Power CompanyNEVP · outside the frame 55 MWa out
• British Columbia Hydro and Power AuthorityBCHA · outside the frame 21 MWa out
• Idaho PowerIPCO · inside the frame 11 MWa in
• Avangrid RenewablesAVRN · inside the frame 177 MWa in
• GridforceGRID · inside the frame 227 MWa in
• Douglas County PUDDOPD · inside the frame 274 MWa in
• Grant PUDGCPD · inside the frame 415 MWa in
• Chelan County PUDCHPD · inside the frame 568 MWa in
• NorthWestern EnergyNWMT · inside the frame 651 MWa in

Dated context on the same month axis as the series: units entering service or retiring, publisher-dated events and changes in which authorities the frame holds. A mark never explains, causes or adjusts a series.

EIA's reported operating or retirement month of the unit (precision month) from the newest EIA account that lists it; an EIA-860M report month is never an event date. Nameplate capacity in MW: a rating, not output. Summed only across units within one month, kind and resource group. The balancing authority named by the EIA-860M assertion in force in the event month, or, where none in force names one, by the assertion whose validity is nearest it (the earlier on a tie); a unit whose assertions name none is listed as unplaced, never dropped, and a unit placed outside the frame is counted. Planned operating and retirement months are EIA forecasts and are not marked.

• Entered service, January 2016 to August 2026293 units in frame authorities
  8,344.6 MWnameplate
• Retired, January 2016 to August 2026101 units in frame authorities
  3,066.3 MWnameplate

1 unit with an event in the window has no balancing authority in any EIA-860M assertion and is listed below, not dropped; 12 placed outside the frame are not marked.

Publisher-dated events

Notable events a publisher dated, in the publisher's own date and precision, each with its page. A curated list, not a census; the row's MW is not drawn, since several rows are proposals.

• Marengo Wind Plant: PacifiCorp ordered 216 MW of Vestas V100 turbine components to repower the Marengo I and II wind farms in Columbia County.Vestas, source ↗
  2018-06-29announced
• Colstrip Steam Electric Station Units 1-2: Talen Montana retired Colstrip's two oldest coal units as no longer economically viable.KULR8, source ↗
  2020-01-05retired
• Hardin Generating Station: Marathon Patent Group and Beowulf Energy announced a joint venture to power a bitcoin mining data center from the coal-fired Hardin plant.Marathon Patent Group, source ↗
  2020-10-13announced
• Boardman Coal Plant: PGE ceased coal combustion at Boardman, ending coal-fired power in Oregon 20 years ahead of the original schedule.Portland General Electric, source ↗
  2020-10-15retired
• Centralia Generating Facility Unit 1: TransAlta retired Centralia's first coal boiler on the deadline set by Washington's 2011 coal-transition law (SB 5769).Washington State Department of Ecology, source ↗
  2020-12-31retired
• Lewis & Clark Station: Montana-Dakota Utilities retired its Lewis and Clark coal unit in Sidney as uneconomical against low-cost gas and wind.Montana Free Press, source ↗
  2021-03-31retired
• Hardin Generating Station: Marathon Digital announced intent to move its bitcoin mining rigs off the coal-fired Hardin plant to lower-carbon power sources.Marathon Digital Holdings, source ↗
  2022-04-05withdrawn
• Colstrip Steam Electric Station Units 3-4: NorthWestern Energy agreed to acquire Avista's 15 percent (222 MW) share of Colstrip units 3 and 4 at no cost.Montana Free Press, source ↗
  2023-01-16announced
• Carbon Free Power Project (NuScale/UAMPS): UAMPS and NuScale mutually terminated plans for six 77 MW SMR modules at Idaho National Laboratory, citing insufficient subscription.Utility Dive, source ↗
  2023-11-08cancelled
• Whistling Ridge Energy Project: EFSEC denied requests to revive or transfer the expired site permit, ending the long-contested Skamania County wind project.Washington Energy Facility Site Evaluation Council, source ↗
  2024-07-17cancelled
• John C Boyle Dam: Crews breached the J.C. Boyle cofferdam, restoring the Klamath's channel; Copco 2 (2023) and Copco 1/Iron Gate in California (2024) were also removed.Klamath River Renewal Corporation, source ↗
  2024-07-30dam removed
• Cascade Advanced Energy Facility: Amazon, Energy Northwest and X-energy announced four Xe-100 small modular reactors near Columbia Generating Station, expandable to 960 MW.Energy Northwest, source ↗
  2024-10-16announced
• Horse Heaven Wind Farm: Governor Inslee signed the site certification agreement for the combined wind, solar and battery project; Yakama Nation appealed.Washington Energy Facility Site Evaluation Council, source ↗
  2024-10-18permitted
• Desert Claim Wind Power Project: EFSEC approved the developer's request to terminate its site certificate, citing no economically feasible financing path.Washington Energy Facility Site Evaluation Council, source ↗
  2025-06-25cancelled
• Boardman to Hemingway Transmission Line: Idaho Power began construction on the 293-mile, 500kV B2H line from Boardman, Oregon to the Hemingway substation near Melba, Idaho.Baker City Herald, source ↗
  2025-08construction started
• Lava Ridge Wind Project: Interior Secretary Burgum rescinded BLM's approval of the 231-turbine Magic Valley Energy wind project in southern Idaho.U.S. Department of the Interior, source ↗
  2025-08-06cancelled
• Centralia Generating Facility Unit 2: TransAlta and Puget Sound Energy signed a tolling deal to convert Unit 2 from coal to gas, targeting 2028 startup through 2044.TransAlta, source ↗
  2025-12-09announced
• Centralia Generating Facility Unit 2: DOE ordered TransAlta to keep Unit 2 available for 90 days past its Dec. 31, 2025 statutory retirement deadline.TransAlta, source ↗
  2025-12-16announced
• Centralia Generating Facility Unit 2: Washington's 2011 law and TransAlta's agreement set this deadline for Unit 2; a federal emergency order kept it running past it.Washington State Department of Ecology, source ↗
  2025-12-31retirement planned
• Colstrip Steam Electric Station Units 3-4: Puget Sound Energy's 370 MW and Avista's 222 MW shares of Colstrip units 3-4 transferred to NorthWestern at no cost, raising its stake to 55 percent.Montana Free Press, source ↗
  2026-01-01announced
• Goldendale Energy Storage Project: FERC issued a 40-year licence for the Goldendale pumped-storage project at Pushpum, over Yakama Nation and tribal objections.Capital Press, source ↗
  2026-01-22licence issued
• Leaning Juniper Wind Power II: Repowering (blade and nacelle replacement) began at the Leaning Juniper IIB facility in Gilliam County under an EFSC-approved amendment.Oregon Department of Energy, source ↗
  2026-05converted
• VoltaGrid Quincy On-Site Generation Project: VoltaGrid withdrew its permit application for a gas plant to power a Vantage data center in Quincy after organized opposition.KUOW, source ↗
  2026-07withdrawn
• Badger Mountain Solar: Avangrid subsidiary Aurora Solar withdrew its application after years of opposition from the Colville Tribes over the sacred site.Washington Energy Facility Site Evaluation Council, source ↗
  2026-07-20withdrawn

Frame changes

Months in which the frame changes: the first or last month the source lists an authority's reports, and a start or end the frame configuration dates. A listing month the source covers only in part leaves the frame sum null.

• The source first lists AVRN in 2018-07, for 17 of 744 hoursba_monthly_930; ba_code=AVRN; period=2018-07; hours_listed· pudl-930-operations
  July 2018
• The frame configuration ends WWA's membership on 2025-10-01; retired per EIA code table; kept for historical validity, checked against source retirement date at importframe v1; ba_code=WWA; valid_to=2025-10-01· pudl-codes-balancing-authorities
  October 2025
• The source last lists WWA in 2025-10, for 6 of 744 hoursba_monthly_930; ba_code=WWA; period=2025-10; hours_listed· pudl-930-operations
  October 2025

Each month adds, for every authority the source lists that month and that owes the measure, its mean over the hours it reported and the atlas kept (MWh divided by those hours). eligible counts those authorities, reporting how many kept at least one hour, complete how many were listed for every hour of the month and kept each one. Where complete is below eligible the month is partial: a short authority's mean stands for its missing hours, including hours EIA replaced and the atlas left out. The sum is null, with the reason, when an eligible authority kept no hour, kept fewer than a quarter of the month's hours, or is listed by the source for only part of the month; it is never a sum over fewer authorities. Flows between frame authorities cancel in the interchange sum only where both sides report the same value, so this is not a metered boundary.

• U.S. EIA Form 930 Hourly and Daily Balancing Authority Operations Report: demand, net generation, total interchange, day-ahead demand forecast per balancing authority and UTC hourreported · direct · balancing authority x UTC hour (hour-ending)ba_monthly_930; every ba_code; period 2016-01 to 2026-08
  PUDL v2026.9.0 (embedded 2026.8.1.dev50)retrieved 2026-09-29Publisher ↗
• U.S. EIA Form 930: directed interchange between a reporting balancing authority and each adjacent authority per UTC hourreported · direct · reporting authority x adjacent authority x UTC hour (hour-ending)ba_pair_monthly_930; ba_code=BPAT; period 2016-01 to 2026-08
  PUDL v2026.9.0 (embedded 2026.8.1.dev50)retrieved 2026-09-29Publisher ↗
• U.S. EIA Form 860M (monthly generator inventory) as a changelog: one row per generator per month in which any tracked attribute changed, valid until the next changereported · derived · generator x report_date (month of change) with valid_until_dateinventory_history; source_ref=pudl-860m-changelog; balancing_authority_code_eia of the assertion nearest each marked unit's event month
  PUDL v2026.9.0 (embedded 2026.8.1.dev50)retrieved 2026-09-29Publisher ↗
• eia860m-inventory · · latest_generator; operating_date and retirement_date of units EIA lists as having run or retired
  no publisher edition or metadata date stated; retrieved 2026-09-29T04:57:19Zretrieved 2026-09-29
• U.S. EIA Form 860 (mix of EIA forms, harvested)reported · derived · generator x report_date (annual)generator_snapshot; operating_date and retirement_date of units the monthly inventory does not list
  PUDL v2026.9.0 (embedded 2026.8.1.dev50)retrieved 2026-09-29Publisher ↗
• EIA balancing authority code dictionary · · code_ba; is_generation_only; the frame configuration's valid_from and valid_to
  PUDL v2026.9.0 (embedded 2026.8.1.dev50)retrieved 2026-09-29

Checks in this release: keys.ba_hourly_930_unique passed · history.930_hours_bounded passed · history.930_frame_coverage passed · history.930_flagged_hours_excluded passed · history.930_marks_bounded passed · history.930_pair_disagreement passed. About the monthly dataset.