Taum Sauk — Plant Summary
- EIA Plant ID
- 2108
- Capacity
- 408 MW
- Primary Fuel
- Hydro
- Technology
- Hydroelectric Pumped Storage
- Status
- Operating
- Location
- Reynolds, MO
- Operating Since
- 1963
- Generators
- 2
- Operator
- Union Electric Co - (MO)
- Parent Company
- Ameren
- Annual Generation
- -159,810 MWh
- Capacity Factor
- -4.5%
- Balancing Authority
- Midcontinent Independent Transmission System Operator, Inc..
- ISO/RTO
- MISO
- NERC Region
- SERC
Taum Sauk
OperatingHydro
Ranked #1 of 8 Hydro plants in MO#60 of 1454 nationally
408 MW Hydro operating in Reynolds, MO — Midcontinent Independent Transmission System Operator, Inc..
EIAGEMWD
408 MW
Nameplate Capacity
2
Generators
units
Hydroelectric Pumped Storage
Technology
1963
Operating Since
Location
Coordinates
37.5208, -90.8347
County
Reynolds, MO
Ownership & Operator
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 | — |
Ownership Chain
About
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
Engineering & Generators
Grid Context
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
Generation
−10.5K MWh
Net Charging
-159.8K MWh
Annual Net Energy
-4.5%
Capacity Factor
Jan 2023 – Dec 2025
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.
Financial DataBeta
Source: FERC Form 1HIGH
$386/kW
Installed Cost
$12.6/MWh
Operating Cost
UNION ELECTRIC COMPANY
Reporting Utility
Cumulative Installed Cost
Per-Unit Cost Trends
Pricing & Market Data
HIGH confidenceMarket Position
ISO/RTO Market
MISO
LMP Node
AMMO.TS1
Pricing Hub
ILLINOIS.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
News & Articles (10)Beta
General
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...
Utility Dive·4 weeks ago
General
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...
KBSI Fox 23 Cape Girardeau News | Paducah News·4 weeks ago
General
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...
Utility Dive·4 weeks ago
General
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,...
CPG Click Petróleo e Gás·2 months ago
Last updated 2026-03-26
View all 10 articles