How many battery storage projects are planned in Iowa?

Developers have proposed 14 battery storage projects in Iowa with 2.2 GW of capacity, according to the grid operators' interconnection queues. Most queue projects are never built.

What is the largest planned battery storage project in Iowa?

Sub K (Tiffin)-Duane Arnold 345kV in Linn County, Iowa is the largest planned, at 300 MW. It is expected to come online in 2027.

Who is developing battery storage projects in Iowa?

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.

Planned battery storage projects in Iowa

Developers have proposed 14 battery storage projects in Iowa with 2.2 GW of capacity, in the grid operators' interconnection queues.

Planned14

See operating battery storage projects in Iowa

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

More planned battery storage projects in Iowa are expected online in 2026 than in any other year

2026’262027’272028’282029’292030’302031’312032’322033’33

Planned battery storage projects by the year they're expected online. Source: the grid operators' interconnection queues, compiled by Cleanview.

The 10 largest planned battery storage projects in Iowa

Planned, by capacity

#	Battery storage project	County	Expected online	Capacity
1	Sub K (Tiffin)-Duane Arnold 345kV	Linn County	2027	300 MW
2	Hazleton	Buchanan County	2028	205 MW
3	Duane Arnold	Buchanan County	2026	200 MW
4	BEACON	Mahaska County	2027	200 MW
5	Calamus East	Clinton County	2028	200 MW
6	Quinn	Franklin County	2026	200 MW
7	Army Post 161kV Substation	Polk County	2027	170 MW
8	Army Post 161 kV Substation	Polk County	2026	170 MW
9	Story County	Story County	2028	150 MW
10	Fairfax	Linn County	2030	100 MW

Planned battery storage projects expected online soonest in Iowa

In the next 18 months, soonest first

#	Battery storage project	County	Expected online	Capacity
1	Army Post 161kV Substation	Polk County	2027	170 MW
2	Marshalltown 161 kV Substation	Marshall County	2027	100 MW
3	BEACON	Mahaska County	2027	200 MW
4	Sub K (Tiffin)-Duane Arnold 345kV	Linn County	2027	300 MW
5	Calamus East	Clinton County	2028	200 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 Iowa

How many battery storage projects are planned in Iowa?: Developers have proposed 14 battery storage projects in Iowa with 2.2 GW of capacity, according to the grid operators' interconnection queues. Most queue projects are never built.
What is the largest planned battery storage project in Iowa?: Sub K (Tiffin)-Duane Arnold 345kV in Linn County, Iowa is the largest planned, at 300 MW. It is expected to come online in 2027.
Who is developing battery storage projects in Iowa?: 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.