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2.5 MW BESS operating in Winneshiek, IA
2.5 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2021
Operating Since
Coordinates
43.3240, -91.7930
County
Winneshiek, IA
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Interstate Power and Light Co | Interstate Power and Light | — |
| Owner(s) | Interstate Power and Light Co | Alliant Energy | — |
| Status | Operating | — | — |
Decorah Battery is a 2.5 MW battery energy storage system located in Winneshiek County, Iowa. The plant began operating in 2021 and is owned by Alliant Energy, with Interstate Power and Light Co. listed as the EIA operator. It is the second-largest of four battery storage plants in Iowa, and ranks 1090th out of 1205 nationally. The plant consists of a single generator utilizing battery technology, with a total storage capacity of 2.9 MWh.
The battery system uses lithium-ion (LIB) chemistry and has a duration of 1.16 hours. Decorah Battery operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority, within the NERC region MRO. The plant's primary fuel is electricity (MWH), indicating it charges from the grid.
Generated from EIA, GEM, and public data sources
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
MRO — Midwest Reliability Organization
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc.. (MISO)
Grid Voltage
13.8 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
−4 MWh
Net Charging
-88 MWh
Annual Net Energy
-0.4%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
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2021
$1,796/kW
Est. Construction Cost
Total estimated cost: $4.5M
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Point of Interconnection
Nearest Substation
Decorah Substation · 69 kV
Substation Distance
< 10 km
Operator
Alliant Energy
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
—
Pricing Hub
MINN.HUB
Node Source
OSM spatial match
Substation identified. Node ID not yet resolved against ISO roster.
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-04-09
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