Callisto I Energy Center
Jupiter Power · Harris County · ERCOT
Callisto I Energy Center is a standalone battery facility in Harris County, Texas, owned and operated by Jupiter Power. Jupiter and two project-financing records describe the completed facility as 200 MW / 400 MWh and report commercial operation in August 2024. EIA's May 2026 operating inventory currently carries a different registry rating of 223.4 MW nameplate and 200 MWh energy capacity. Both source bases are shown because they are not directly reconcilable from the reviewed public records.
Overview
Key fields
- 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
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
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 CSVEIA-923 reports gross generation and net grid exchange for storage plants. Gross generation is shown as a discharge proxy; it is not a cycle count or conventional capacity factor.
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 ReportMatched to the latest available ERCOT generation-interconnection queue record. Queue status and completion dates describe the queue record; operating status is verified separately against plant and market registrations.
Nearby substations
HIFLD infrastructure inventoryCommercial, 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
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.
Parties and identifiers
| Relationship | Entity | Basis |
|---|---|---|
| Owner / developer | Owner / developer for Callisto I Energy Center | |
| Portfolio lender | Financing covers a portfolio that includes Callisto I Energy Center. | |
| Grid selection | plant:plant-66338 | Canonical asset page /ercot/assets/plant/callisto-i-energy-center. |
Reporting portfolio
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
Timeline and sources
Project milestones and public references behind the asset profile.
Project timeline
- Generator enters operationEIA-860
EIA-860 lists generator CALL1 with this operating date.
- Jupiter announced commercial operationJupiter Cal...
The company described a 200 MW / 400 MWh operating facility.
- ITC bridge facility closedKeyBanc Cal...
KeyBanc closed a $59 million senior secured facility.
Sources
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