How many battery storage projects are planned in Washington?

7, for 3 GW of nameplate capacity. These are generators developers have reported to EIA, not generators that exist.

What do the status letters mean?

EIA files each planned generator under a status: regulatory approvals pending, under construction at or below half complete, under construction more than half complete, construction complete but not yet in commercial operation, or planned but not yet started. Each row shows its own.

Do these projects always get built?

No. EIA keeps a separate Canceled or Postponed sheet, and projects move between the sheets month to month. This page is the Planned sheet for 2026-07 and nothing more.

Planned battery storage projects in Washington

What EIA-860M's Planned sheet says is coming in Washington: 7 battery storage projects totalling 3 GW, each with the in-service year its developer reported and the construction status EIA records. A planned project is not a built one.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Planned projects: 7; 11 generating units
Proposed capacity: 3 GW
Earliest in-service year: 2026
Latest in-service year: 2031

Map of planned battery storage projects in Washington

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List of planned battery storage projects in Washington

Planned battery storage projects in Washington

Hop Hill Solar Generation and BESS3 technologies	HOHI bn, LLC	Benton	1,200	3	2031	Regulatory approvals pending. Not under construction
Lower Snake Solar Generation BESS2 technologies	LOSN, LLC	Garfield	600	2	2029	Regulatory approvals pending. Not under construction
Royal Slope2 technologies	Royal Slope Solar LLC	Grant	520	2	2027	Regulatory approvals received. Not under construction
Centralia Battery Energy Storage SystemBatteries	CENT bn, LLC	Thurston	200	1	2028	Regulatory approvals pending. Not under construction
Greenwater BESSBatteries	GREE bn, LLC	Pierce	200	1	2026	Under construction
AGATE BESSBatteries	BrightNight Power	Kitsap	170	1	2029	Regulatory approvals pending. Not under construction
Arlington Battery Energy Storage SystemBatteries	PUD No 1 of Snohomish County - (WA)	Snohomish	25	1	2026	Under construction

Where they are in the build

Regulatory approvals pending. Not under construction4
Regulatory approvals received. Not under construction1
Under construction1
Under construction1

Planned battery storage projects in Washington: FAQ

How many battery storage projects are planned in Washington?: 7, for 3 GW of nameplate capacity. These are generators developers have reported to EIA, not generators that exist.
What do the status letters mean?: EIA files each planned generator under a status: regulatory approvals pending, under construction at or below half complete, under construction more than half complete, construction complete but not yet in commercial operation, or planned but not yet started. Each row shows its own.
Do these projects always get built?: No. EIA keeps a separate Canceled or Postponed sheet, and projects move between the sheets month to month. This page is the Planned sheet for 2026-07 and nothing more.