How many battery storage projects are in Idaho?

Idaho has 10 operating utility-scale battery storage projects with 0.7 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest battery storage project in Idaho?

Hemmingway BESS in Owyhee County, Idaho is the largest, at 166 MW. It came online in 2026.

How many battery storage projects were built in Idaho in 2025?

7 battery storage projects came online in Idaho in 2025, with 303 MW of capacity.

Who is developing battery storage projects in Idaho?

Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.

Battery storage projects in Idaho

Idaho has 10 operating battery storage projects with 0.7 GW of capacity. 7 came online in 2025.

Operating10

See planned battery storage projects in Idaho

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

Idaho had 1 battery storage projects online in 2024 and 10 in 2026

2024’242025’252026’26

Battery storage projects online at the end of each year. Source: EIA-860M, compiled by Cleanview.

The 10 largest battery storage projects in Idaho

Operating, by capacity

#	Battery storage project	County	Year online	Capacity
1	Hemmingway BESS	Owyhee County	2026	166 MW
2	Kuna BESS	Ada County	2025	150 MW
3	Boise Bench BESS	Ada County	2026	150 MW
4	Happy Valley Battery Storage	Canyon County	2025	82 MW
5	Franklin Battery Storage	Twin Falls County	2025	60 MW
6	Black Mesa BESS	Elmore County	2024	40 MW
7	Elmore BESS	Elmore County	2025	4 MW
8	Weiser BESS	Washington County	2025	3 MW
9	Filer BESS	Twin Falls County	2025	2 MW
10	Melba BESS	Canyon County	2025	2 MW

Battery storage projects that came online most recently in Idaho

Newest first

#	Battery storage project	County	Year online	Capacity
1	Boise Bench BESS	Ada County	2026	150 MW
2	Hemmingway BESS	Owyhee County	2026	166 MW
3	Happy Valley Battery Storage	Canyon County	2025	82 MW
4	Kuna BESS	Ada County	2025	150 MW
5	Elmore BESS	Elmore County	2025	4 MW
6	Weiser BESS	Washington County	2025	3 MW
7	Filer BESS	Twin Falls County	2025	2 MW
8	Melba BESS	Canyon County	2025	2 MW
9	Franklin Battery Storage	Twin Falls County	2025	60 MW
10	Black Mesa BESS	Elmore County	2024	40 MW

The developer behind each project is on paid plans. See plans

How Cleanview tracks battery storage projects

Operating battery storage projects come from the EIA's monthly survey of power plants. Planned projects come from the grid operators' interconnection queues. We research who is developing each one, since a queue lists a project company, not its owner.

Questions about battery storage projects in Idaho

How many battery storage projects are in Idaho?: Idaho has 10 operating utility-scale battery storage projects with 0.7 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest battery storage project in Idaho?: Hemmingway BESS in Owyhee County, Idaho is the largest, at 166 MW. It came online in 2026.
How many battery storage projects were built in Idaho in 2025?: 7 battery storage projects came online in Idaho in 2025, with 303 MW of capacity.
Who is developing battery storage projects in Idaho?: Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.