How many solar farms are planned in Iowa?

Developers have proposed 41 solar farms in Iowa with 5.8 GW of capacity, according to the grid operators' interconnection queues. Most queue projects are never built.

What is the largest planned solar farm in Iowa?

Duane Arnold in Linn County, Iowa is the largest planned, at 400 MW. It is expected to come online in 2024.

Who is developing solar farms 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 solar farms in Iowa

Developers have proposed 41 solar farms in Iowa with 5.8 GW of capacity, in the grid operators' interconnection queues.

Planned41

See operating solar farms in Iowa

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

More planned solar farms in Iowa are expected online in 2026 than in any other year

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

Planned solar farms by the year they're expected online. Source: the grid operators' interconnection queues, compiled by Cleanview.

The 10 largest planned solar farms in Iowa

Planned, by capacity

#	Solar farm	County	Expected online	Capacity
1	Duane Arnold	Linn County	2024	400 MW
2	Hawkeye Solar, LLC	Clinton County	2028	250 MW
3	Hawkeye Solar II, LLC	Clinton County	2028	250 MW
4	SUB 93 LOUISA - SUB T HASKINS 345.0kV	Louisa County	2030	250 MW
5	Obrien - Kossuth 345kV Line (J529 & J590 New Substation)	Palo Alto County	2023	250 MW
6	Killdeer	Cerro Gordo County	2026	210 MW
7	Killdeer	Cerro Gordo County	2026	210 MW
8	Hawkeye Solar, LLC	Clinton County	2028	200 MW
9	Calamus East 161 kV Substation	Clinton County	2025	200 MW
10	Sub 92 345 kV	Muscatine County	2026	200 MW

Planned solar farms expected online soonest in Iowa

In the next 18 months, soonest first

#	Solar farm	County	Expected online	Capacity
1	Mills Solar Project	Mills County	2026	50 MW
2	Grandview Substation 69 kV	Muscatine County	2027	23 MW
3	SUB T HASKINS	Washington County	2027	200 MW
4	ATLANTIC - ADAIR 161.0kV	Cass County	2027	42 MW
5	Other_	Worth County	2027	135 MW
6	Coggon Solar LLC	Linn County	2027	100 MW
7	MPW Solar 1	Muscatine County	2028	24 MW
8	Hawkeye Solar, LLC	Clinton County	2028	250 MW
9	Hawkeye Solar II, LLC	Clinton County	2028	250 MW
10	Hawkeye Solar, LLC	Clinton County	2028	200 MW

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

How Cleanview tracks solar farms

Operating solar farms 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 solar farms in Iowa

How many solar farms are planned in Iowa?: Developers have proposed 41 solar farms in Iowa with 5.8 GW of capacity, according to the grid operators' interconnection queues. Most queue projects are never built.
What is the largest planned solar farm in Iowa?: Duane Arnold in Linn County, Iowa is the largest planned, at 400 MW. It is expected to come online in 2024.
Who is developing solar farms 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.