Bat Cave — renewablesinfo.org

Bat Cave — Plant Summary

EIA Plant ID: 64312
Capacity: 100 MW
Primary Fuel: Battery Storage
Technology: Batteries
Status: Operating
Location: Mason, TX
Operating Since: 2021
Generators: 1
Operator: Engie North America
Parent Company: ENGIE
Annual Generation: -21,666 MWh
Capacity Factor: -2.5%
Balancing Authority: Electric Reliability Council of Texas, Inc.
ISO/RTO: ERCOT
NERC Region: TRE

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Bat Cave

OperatingBESS

Ranked #150 of 256 BESS plants in TX#310 of 837 nationally

100 MW BESS operating in Mason, TX — Electric Reliability Council of Texas, Inc.

EIAWD

100 MW

Nameplate Capacity

Generators

unit

Batteries

Technology

2021

Operating Since

Location

Coordinates

30.7341, -99.2311

County

Mason, TX

Ownership & Operator

Field	EIA	GEM	Wikidata
Operator	Engie North America	Engie North America	—
Owner(s)	Engie North America	ENGIE	—
Status	Operating	—	—

Ownership Chain

About

Located in Mason County, Texas, the Bat Cave power plant is a 100 MW battery energy storage system (BESS) facility owned by ENGIE, a company based in France, and operated by Engie North America. The plant began operating in 2021 and utilizes lithium-ion batteries (LIB) as its storage chemistry. The facility has a total storage capacity of 110 MWh, providing a duration of 1.1 hours at its full power output. The plant's primary fuel is electricity (MWH), which it uses to charge and discharge its batteries.

The Bat Cave plant operates within the Electric Reliability Council of Texas (ERCOT) balancing authority, placing it within the Texas Reliability Entity (TRE) NERC region. With a capacity of 100 MW, the plant is ranked as the 203rd largest power plant in Texas out of 224 facilities and 489th nationally out of 514. The plant consists of a single generator and has garnered some media attention, with 10 news articles published about it, covering topics such as industry trends, grid operations, and regulatory matters.

Generated from EIA, GEM, and public data sources

EIA Plant Profile Wikidata

Engineering & Generators

Grid Context

NERC Region

TRE

Balancing Authority

Electric Reliability Council of Texas, Inc.

Grid Voltage

138 kV

Regulatory Status

Entity Type

Independent Power Producer

Sector

IPP Non-CHP

Generation

−857 MWh

Net Charging

-21.7K MWh

Annual Net Energy

-2.5%

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 Data

No financial data available for this plant.

Pricing & Market Data

HIGH confidence

Point of Interconnection

Nearest Substation

Fort Mason Substation · 138 kV

Substation Distance

0 km

Operator

Lower Colorado River Authority

Coord Source

OSM spatial

Market Position

ISO/RTO Market

ERCOT

LMP Node

BATCAVE_RN

Pricing Hub

HB_SOUTH

Secondary Zone

LZ_SOUTH

Location Type

Resource Node

Node Source

Curated node match

News & Articles (10)Beta

Regulatory·permitting

California Energy Commission public information meeting for Engie BESS project draws huge interest

The public engagement phase of permitting for Engie's Compass Energy Storage project is well underway, after the California Energy Commission (CEC) held an...

Engie (developer)California Energy Commission (regulator)

Energy-Storage.News·9 months ago