# Callisto I Energy Center

ERCOT asset profile · https://askthegrid.com/assets/facilities/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.

## 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.

## Metrics

- **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

## Facts

- **Company configuration:** 200 MW / 400 MWh — Jupiter Power · confidence: high
- **EIA configuration:** 223.4 MW / 200 MWh — EIA · confidence: high
- **Owner and operator:** Jupiter Power — Company and financing disclosures · confidence: high
- **Location:** Central Houston — Jupiter Power · confidence: high

## Related parties

- **Owner / developer:** Jupiter Power — Owner / developer for Callisto I Energy Center ([source](https://jupiterpower.io/))
- **Portfolio lender:** First Citizens Bank — Financing covers a portfolio that includes Callisto I Energy Center. ([source](https://firstcitizens.com/))

## Sources

- [EIA May 2026 generator inventory](https://www.eia.gov/electricity/data/eia860m/) — U.S. Energy Information Administration · regulatory — Current generator records, capacity scopes, dates, status, operator, and technology.
- [Jupiter Callisto operation announcement](https://www.jupiterpower.io/post/jupiter-power-announces-commercial-operations-of-400mwh-of-dispatchable-power-in-houston-and-continued-investment-in-texas) — Jupiter Power · official — Company configuration, operating date, location and project role.
- [Jupiter Callisto construction financing](https://jupiterpower.io/first-citizens-bank-provides-65-2-million-to-jupiter-power-for-standalone-battery-energy-storage-project-financing/) — Jupiter Power and First Citizens Bank · official — $65.2 million exact-project construction financing.
- [KeyBanc Callisto transaction](https://www.key.com/businesses-institutions/our-transactions/deals.jupiter-powers-callisto.html) — KeyBanc Capital Markets · official — $59 million ITC bridge and financing roles.

---

Canonical page: https://askthegrid.com/assets/facilities/callisto-i-energy-center
Website: [Jupiter Power](https://jupiterpower.io/)
Profile published: 2026-07-17T03:34:06.407Z
Source: Ask the Grid — https://askthegrid.com/