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Washington (US-WA)

Market Type: Regulated (No Retail Choice)
SSS Relevance: ⭐⭐⭐ High — Dominant hydroelectric base, nuclear generation, strong clean energy policy
Grid Carbon Intensity: ~85-100 gCO₂/kWh (one of cleanest in US)

1. Overview​

Washington operates the cleanest grid in the continental United States, powered primarily by hydroelectric dams on the Columbia River system. The state is the nation's leading hydroelectric producer and has mandated 100% clean electricity by 2045.

MetricValueSource
Hydroelectric share~59% (2024)EIA
Renewable share~85% of renewables are hydroEIA
Nuclear~8% of generationEnergy Northwest
Coal phase-outEnd of 2025 (Centralia)WA Commerce
Grid carbon intensity~85-100 gCO₂/kWhEPA eGRID

Grid characteristics:

  • 9 of 10 largest power plants are hydroelectric
  • Columbia River system provides bulk of generation
  • Significant power exports to California and other states
  • BPA (Bonneville Power Administration) manages federal hydro

SSS Relevance​

Washington is highly relevant for SSS due to:

  • ✅ Massive hydroelectric base — 59% of generation from legacy hydro
  • ✅ Nuclear generation — Columbia Generating Station (~8%)
  • ✅ CETA explicitly includes hydro — Eligible for 100% clean goal
  • ✅ Low REC complexity — Simpler compliance structure than California

2. Market Structure​

Retail Choice​

None — Washington operates as a regulated market without retail choice.

Utility Types​

TypeExamples% of Load
IOUsPuget Sound Energy, Avista, PacifiCorp~35%
Public Utility Districts (PUDs)Chelan, Grant, Snohomish~40%
MunicipalSeattle City Light, Tacoma Power~20%
Co-opsVarious rural~5%

Note: Public power (PUDs + municipals) serves the majority of Washington customers, a unique market structure.

Federal Power Role​

Bonneville Power Administration (BPA):

  • Markets power from federal dams (Grand Coulee, etc.)
  • Serves public utilities, co-ops, and some IOUs
  • Operates ~75% of high-voltage transmission in region
  • Key player in SSS resource tracking

3. Clean Energy Policy​

State Mandates (CETA — Clean Energy Transformation Act of 2019)​

MilestoneYearRequirement
Coal elimination2025No coal in utility portfolios
Carbon neutral203080% clean + 20% offsets allowed
100% clean2045All retail sales carbon-free

CETA Resource Eligibility​

ResourceCETA StatusSSS Implications
Hydroelectric (all sizes)✅ EligibleClearly SSS
Nuclear✅ EligibleClearly SSS
Wind/Solar✅ EligibleGray Area — depends on REC status
Natural gas❌ Must phase outNot SSS-eligible
Coal❌ Banned by 2025Not SSS-eligible

Key for SSS: CETA explicitly includes existing hydroelectric (regardless of size) as eligible for the 100% clean mandate. This is different from California's RPS which excludes large hydro.

REC/Compliance Structure​

  • Washington uses RECs for renewable compliance
  • However, hydroelectric is counted toward clean energy without traditional REC retirement
  • Simpler structure than California's RPS + zero-carbon distinction

4. Utility Landscape​

Investor-Owned Utilities​

UtilityService AreaNotes
Puget Sound EnergyPuget Sound regionLargest IOU, ~1.2M electric customers
AvistaEastern WA (Spokane)Also serves Idaho
PacifiCorpSoutheast WAMulti-state (Berkshire Hathaway)

Public Utility Districts (PUDs)​

Washington has 28 PUDs — publicly owned, locally governed:

PUDNotable Assets
Chelan County PUDRock Island, Rocky Reach dams
Grant County PUDWanapum, Priest Rapids dams
Snohomish County PUDLargest PUD by customers
Douglas County PUDWells Dam

Municipal Utilities​

UtilityService AreaClean Energy
Seattle City LightSeattle97%+ carbon-free
Tacoma PowerTacomaPrimarily hydro

5. SSS-Eligible Resources​

Summary​

Resource TypeCapacity% of GenerationSSS Classification
Hydroelectric~21,000+ MW~59%Clearly SSS
Nuclear~1,207 MW~8%Clearly SSS
Wind~3,500+ MW~7%Gray Area
SolarGrowingLess than 1%Gray Area

Hydroelectric (Clearly SSS)​

Washington is the #1 hydroelectric producer in the US (~25% of national hydro generation).

Major Facilities​

FacilityCapacity (MW)RiverOperatorSSS Classification
Grand Coulee~6,809ColumbiaBureau of Reclamation/BPAClearly SSS
Chief Joseph~2,614ColumbiaUSACE/BPAClearly SSS
John Day~2,160ColumbiaUSACE/BPAClearly SSS
The Dalles~1,823ColumbiaUSACE/BPAClearly SSS
Bonneville~1,093ColumbiaUSACE/BPAClearly SSS
Rocky Reach~1,287ColumbiaChelan PUDClearly SSS
Rock Island~660ColumbiaChelan PUDClearly SSS
Wanapum~1,092ColumbiaGrant PUDClearly SSS
Priest Rapids~956ColumbiaGrant PUDClearly SSS
Wells~840ColumbiaDouglas PUDClearly SSS

Grand Coulee Dam is the largest power plant in the United States by capacity.

SSS Rationale: All legacy hydro is Clearly SSS due to:

  • Pre-2000 construction (most built 1930s-1980s)
  • CETA explicitly includes hydro as eligible clean energy
  • No REC retirement complications for federal/PUD hydro
  • Pro-rata allocation straightforward

Nuclear (Clearly SSS)​

Columbia Generating Station

AttributeValue
LocationHanford Site, Richland
OperatorEnergy Northwest
Capacity~1,207 MW
% of state generation~8%
License expirationDecember 2043
DistributionVia BPA to regional utilities

SSS Classification: Clearly SSS — Operating nuclear plant with clear ownership and no REC retirement requirements.

Future Nuclear:

  • Energy Northwest + X-energy partnership for up to 12 SMRs near Columbia site
  • Would expand nuclear capacity significantly if built

Wind (Gray Area)​

MetricValue
Capacity~3,500+ MW
% of generation~7%
Major areasColumbia Gorge, Eastern WA

SSS eligibility depends on REC status — verify with supplier attestation.

6. References​

  1. U.S. Energy Information Administration (EIA) — Washington State Profile
  2. Washington State Department of Commerce — Energy Office
  3. Energy Northwest — Columbia Generating Station
  4. Bonneville Power Administration (BPA)
  5. Washington Utilities and Transportation Commission (WUTC)

Last updated: March 2026
Data sources: EIA, Energy Northwest, BPA, SerpAPI research