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20 MW BESS operating in McHenry, IL — PJM Interconnection, LLC
20 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2016
Operating Since
Coordinates
42.3312, -88.2734
County
McHenry, IL
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | McHenry Battery Storage | — | — |
| Owner(s) | McHenry Battery Storage | — | — |
| Status | Operating | — | — |
McHenry Battery Storage is a 20 MW battery energy storage system located in McHenry County, Illinois. The plant, which began operating in 2016, is owned and operated by McHenry Battery Storage. It consists of a single generator utilizing battery technology with lithium-ion (LIB) chemistry. The storage capacity of the battery system is 7.8 MWh, providing a duration of approximately 0.39 hours at full output.
The McHenry Battery Storage facility operates within the PJM Interconnection, LLC balancing authority, which falls under the SERC NERC region. As of the latest rankings, it is the 8th largest of 12 battery storage facilities in Illinois and ranks 695th out of 1205 nationally. The plant's primary fuel source is electricity (MWH), indicating it charges from the grid.
Generated from EIA, GEM, and public data sources
ISO/RTO
PJM
Market
ISO/RTO Member
NERC Region
SERC — SERC Reliability Corporation
Balancing Authority
−282 MWh
Net Charging
-282 MWh
Annual Net Energy
-0.2%
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.
2016
$1,763/kW
Est. Construction Cost
Total estimated cost: $35.3M
Point of Interconnection
Nearest Substation
McHenry Substation · 138 kV
Substation Distance
< 10 km
Operator
Commonwealth Edison
Coord Source
OSM spatial
Market Position
ISO/RTO Market
PJM
LMP Node
193 MCHE34.5 KV L7544
Pricing Hub
N ILLINOIS HUB
Location Type
Load Node
Node Source
EIA-860 direct report
Last updated 2026-03-26
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ask pi about McHenry Battery StoragePJM Interconnection, LLC (PJM)
Grid Voltage
35.5 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP