Callisto I Energy Center
Jupiter PowerHarris County
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.
Mapped infrastructure geometry associated with this asset.
Jupiter Power
EIA
Company and financing disclosures
Jupiter Power
EIA plant 66338 · Inventory for Sep 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| CALL1 | Batteries | Operating | 223.4 | 200 |
Similar plants ranked by technology, capacity, and distance.
Current generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| CALL1 | 223.4 MW 200 MW summer | Batteries BA | Aug 2024 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
EIA-860 lists generator CALL1 with this operating date.
EIA-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.
3 ERCOT market resources · Battery / storage
Cycles/day is discharged energy vs. usable capacity (~407 MWh). Capacity factor is avg discharge vs. peak.
Observed ERCOT settlement prices at CLO_RN over 365 days (2025-10-27 to 2026-10-26).
The TB2 figure is a price benchmark, not revenue: it values one perfect-foresight cycle per day between the 2 cheapest and 2 dearest hours of each day, gross of round-trip losses, and excludes ancillary services. It describes what this node’s price shape was worth over the window — it is not this asset’s realized capture, and no dispatch is assumed or modelled.
Matched 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.
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
The company described a 200 MW / 400 MWh operating facility.
KeyBanc closed a $59 million senior secured facility.
ERCOT SCED disclosure is delayed, so plant performance windows end at the latest disclosed interval.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Callisto I Energy Center reports 223.4 MW battery storage of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.
Callisto I Energy Center is a batteries facility in Harris County, TX, participating in the ERCOT market.
Callisto I Energy Center is in Harris County, TX, inside the ERCOT balancing area.
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.
Callisto I Energy Center reported 116.6 GWh over the twelve months to 2026-07. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.
By capacity, Callisto I Energy Center ranks #50 of 1,061 operating plants of the same technology nationally. It ranks #15 of 254 in TX.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.
