408 MW Hydro operating in Reynolds, MO — Midcontinent Independent Transmission System Operator, Inc..
408 MW
Nameplate Capacity
2
Generators
units
Hydroelectric Pumped Storage
Technology
1963
Operating Since
Coordinates
37.5208, -90.8347
County
Reynolds, MO
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Union Electric Co - (MO) | Union Electric | — |
| Owner(s) | Union Electric Co - (MO) | Ameren | — |
| Status | Operating | operating | — |
The Taum Sauk pumped storage plant is a power station in the St. Francois mountain region of Missouri, United States about 90 miles (140 km) south of St. Louis near Lesterville, Missouri, in Reynolds County. It is operated by Southeastern Ameren Missouri.
Read more on WikipediaThe Taum Sauk pumped storage plant is located in Reynolds County, Missouri. It has a total capacity of 408 MW across two hydroelectric pumped storage generators. The plant's primary fuel source is water (WAT). Taum Sauk is owned and operated by Ameren, specifically Union Electric Co - (MO), and began operating in 1963. It is the largest of four pumped storage plants in Missouri, and ranks 60th out of 194 such facilities nationally.
Taum Sauk operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority and the SERC NERC region. Financial data indicates an installed cost of $268.77 per kW, according to FERC filings. The plant has been the subject of nine news articles, with five focusing on industry-related topics and four concerning hazards.
Generated from EIA, GEM, and public data sources
NERC Region
SERC
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc..
Grid Voltage
138 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
−10.5K MWh
Net Charging
-159.8K MWh
Annual Net Energy
-4.5%
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.
$386/kW
Installed Cost
$12.6/MWh
Operating Cost
UNION ELECTRIC COMPANY
Reporting Utility
Cumulative Installed Cost
Per-Unit Cost Trends
Market Position
ISO/RTO Market
MISO
LMP Node
AMMO.TS1
Pricing Hub
ILLINOIS.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
300-MW Ameren fast-track project hits snag on DOE transmission funding uncertainty
It's unclear if the U.S. Department of Energy will help fund a set of 345-kV projects in the Great Plains region, leaving Ameren Missouri in...
Missouri PSC approves Ameren’s Big Hollow energy project in Jefferson County
JEFFERSON CITY, Mo., (KBSI) — The Missouri Public Service Commission on Wednesday approved an agreement involving Ameren Missouri and...
300-MW Ameren fast-track project hits snag on DOE transmission funding uncertainty
It's unclear if the U.S. Department of Energy will help fund a set of 345-kV projects in the Great Plains region, leaving Ameren Missouri in...
An award-winning power plant turned into a catastrophe after a silent overflow caused the dam to collapse and spill approximately 6 billion liters of water down a mountainside into a state park; the investigation exposed faulty sensors, a lack of spillway, and re
The award-winning Taum Sauk hydroelectric power plant, described as a model of modern engineering and recognized for its innovations,...
Last updated 2026-03-26
View all 10 articles