How big is Callisto I Energy Center?

Callisto I Energy Center has a reported capacity of 223.4 MW and an energy capacity of 400 MWh. Source: Jupiter Callisto operation announcement.

What kind of plant is Callisto I Energy Center?

Callisto I Energy Center is a batteries facility in Harris County, TX, participating in the ERCOT market.

Where is Callisto I Energy Center located?

Callisto I Energy Center is in Harris County, TX, inside the ERCOT balancing area.

Who operates Callisto I Energy Center?

Callisto I Energy Center is operated by Callisto I Energy Center according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Callisto I Energy Center generate?

Callisto I Energy Center reported 117.7 GWh over the twelve months to 2026-06. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.

How does Callisto I Energy Center compare to other plants?

By capacity, Callisto I Energy Center ranks #40 of 962 operating plants of the same technology nationally. It ranks #13 of 223 in TX.

Callisto I Energy Center — 223 MW battery storage, TX

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Callisto I Energy Center — 223 MW battery storage, TX · Ask the Grid

Overview

Company rating: 200 MW / 400 MWh
Jupiter Power
EIA rating: 223.4 MW / 200 MWh
May 2026 inventory
Construction financing: $65.2M
First Citizens · Dec 2023
ITC bridge: $59M
KeyBanc · Aug 2024
Commercial operation: Aug 2024
Jupiter and EIA
Registry anchor: Plant 66338
Callisto I Energy Center

Infrastructure record

Operator: Callisto I Energy Center

Profile

Company configuration: 200 MW / 400 MWh standalone storage; commercial operation announced in August 2024.
EIA registry configuration: 223.4 MW nameplate and 200 MWh energy capacity in the May 2026 inventory.
Site context: Central Houston on the former H.O. Clarke power-plant site.
Financing: $65.2 million construction financing in December 2023 and a $59 million ITC bridge facility in August 2024.

Structured profile

Company configuration: 200 MW / 400 MWh
Jupiter Power
EIA configuration: 223.4 MW / 200 MWh
EIA
Owner and operator: Jupiter Power
Company and financing disclosures
Location: Central Houston
Jupiter Power

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Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
CALL1	223.4 MW 200 MW summer	Batteries Electricity used for energy storage · BA	Aug 2024	Operating

Performance

Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.

Peer context

Technology capacity: 223.4 MW
National rank: #40
TX rank: #13

Monthly generation

Download CSV

Latest 12 months

117.7 GWh

Reported gross generation

Latest report

Jun 2026

EIA-923 monthly filing

2025 net exchange

-23.5 GWh

Generation less station charging

Grid and market context

Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.

Interconnection record

ERCOT GIS Report

Queue project

Callisto I Energy Center

high match · 99/100 · project name, county, capacity

Queue ID / status

22INR0490 · Commissioned

Point of interconnection

47150 HO Clarke 138kV

Interconnecting entity

Callisto I energy center LLC

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Land and environmental record

Coordinate Parcel Area

2025

31.6981 Acres

TxGIO parcel intersecting the mapped EIA plant coordinate; parcel 1420750010001; HARRIS APPRAISAL DISTRICT; tax year 2025

TxGIO land parcel intersecting

Coordinate Parcel Id

2025

1420750010001

TxGIO parcel intersecting the mapped EIA plant coordinate; parcel 1420750010001; HARRIS APPRAISAL DISTRICT; tax year 2025

TxGIO land parcel intersecting

Coordinate Parcel Market Value

2025

3451923

TxGIO parcel intersecting the mapped EIA plant coordinate; parcel 1420750010001; HARRIS APPRAISAL DISTRICT; tax year 2025

TxGIO land parcel intersecting

Coordinate Parcel Owner

2025

CALLISTO II ENERGY CENTER LLC

TxGIO parcel intersecting the mapped EIA plant coordinate; parcel 1420750010001; HARRIS APPRAISAL DISTRICT; tax year 2025

TxGIO land parcel intersecting

Stormwater Permit

TXR1582XB

TCEQ STORMWATER; PERMIT; status ACTIVE

TCEQ STORMWATER: TXR1582XB

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Relationship graph

Drag organizations to explore the network. Select a node to pin its details and available page link.

AssetOwner / operator

Parties and identifiers

OrganizationRoleBasis

Jupiter PowerOwner / developerOwner / developer for Callisto I Energy Center

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Aug 2024
Aug 2024
Generator enters operationEIA-860
EIA-860 lists generator CALL1 with this operating date.
Aug 19, 2024
Aug 19, 2024
Jupiter announced commercial operation

Callisto I Energy Center

Callisto I Energy Center

Overview

Infrastructure record

Profile

Structured profile

Related assets

Hidden Lakes Reliability Project

Bypass BESS

Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Interconnection record

Commercial, land, and environmental record

Land and environmental record

Related parties and identifiers

Relationship graph

Parties and identifiers

Timeline and sources

Project timeline

Citadel Battery Storage Plant

Old 300 Storage Center

Sealy BESS

SMT Ironman Battery Storage Plant

Nearby substations

Reporting portfolio

Sources

Common questions about Callisto I Energy Center

How big is Callisto I Energy Center?

What kind of plant is Callisto I Energy Center?

Where is Callisto I Energy Center located?

Who operates Callisto I Energy Center?

How much electricity does Callisto I Energy Center generate?

How does Callisto I Energy Center compare to other plants?

Co-located assets