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20 MW Hydro operating in Juneau, WI — Midcontinent Independent Transmission System Operator, Inc..
20 MW
Nameplate Capacity
4
Generators
units
Conventional Hydroelectric
Technology
1949
Operating Since
Coordinates
44.0573, -90.0218
County
Juneau, WI
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Wisconsin River Power Company | — | — |
| Owner(s) | Wisconsin Power & Light Co, Wisconsin Public Service Corp | — | — |
| Status | Operating | — | — |
Petenwell is a 20 MW hydroelectric power plant located in Juneau County, Wisconsin. The plant began operating in 1949 and utilizes four generators. It is owned and operated by Wisconsin River Power Company. The primary fuel source is water (WAT), and the plant uses conventional hydroelectric technology. Petenwell ranks as the 12th largest of 65 hydroelectric plants in Wisconsin, and 485th out of 1464 nationally.
The plant operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority. The most recent annual generation data indicates an output of 108,385 MWh, resulting in a capacity factor of 61.8%. Financial data indicates an installed cost of $1,052 per kW. The plant's financial information is sourced from the Federal Energy Regulatory Commission (FERC). Recent news articles covering the plant have focused on hazards.
Generated from EIA, GEM, and public data sources
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
MRO — Midwest Reliability Organization
Balancing Authority
7.3K MWh
Latest Month
108.4K MWh
Annual Generation
61.8%
Capacity Factor
Energy storage · Wisconsin River Power Company · Data from 2015–2024
$1,108/kW
Installed Cost
$14.2/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Point of Interconnection
Nearest Substation
PETENWELL · 138 kV
Substation Distance
< 10 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
WPS.WPSM(50%)/ALTE.ALTE(50%)
Pricing Hub
MICHIGAN.HUB
Alt. Hub / Zone
MINN.HUB
Node Source
EIA-860 direct report
Last updated 2026-03-26
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ask pi about PetenwellMidcontinent Independent Transmission System Operator, Inc.. (MISO)
Grid Voltage
138.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility