How many hydroelectric power plants are planned in Illinois?

2, for 20 MW 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 hydroelectric power plants in Illinois

What EIA-860M's Planned sheet says is coming in Illinois: 2 hydroelectric power plants totalling 20 MW, 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: 2; 14 generating units
Proposed capacity: 20 MW
Earliest in-service year: 2027
Latest in-service year: 2030

Map of planned hydroelectric power plants in Illinois

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List of planned hydroelectric power plants in Illinois

Planned hydroelectric power plants in Illinois

Marseilles Lock and Dam HydroConventional Hydroelectric	Marseilles Land and Water Company	LaSalle	10.4	4	2027	Under construction
Dresden Island Hydroelectric ProjectConventional Hydroelectric	Northern Illinois Hydropower, LLC	Grundy	10	10	2030	Regulatory approvals pending. Not under construction

Where they are in the build

Under construction1
Regulatory approvals pending. Not under construction1

Planned hydroelectric power plants in Illinois: FAQ

How many hydroelectric power plants are planned in Illinois?: 2, for 20 MW 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.