William F. Wyman is a hybrid EIA plant in Yarmouth, Maine: four petroleum-fired units total 846.0 MW nameplate and the separate Casco Bay battery adds 16.7 MW gross.
Mapped infrastructure geometry associated with this asset.
EIA plant 1507 · Inventory for Aug 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| 1 | Petroleum Liquids | Operating | 50 | Unknown |
| 2 | Petroleum Liquids | Operating | 50 | Unknown |
| 3 | Petroleum Liquids | Operating | 113.6 | Unknown |
Mapped infrastructure geometry associated with this asset.
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 50 MW 50.1 MW summer | Petroleum Liquids Residual Fuel Oil · ST | Jan 1957 | Operating |
| 2 | 50 MW 47.8 MW summer | Petroleum Liquids Residual Fuel Oil · ST | Jan 1958 | Operating |
| 3 | 113.6 MW 110.9 MW summer | Petroleum Liquids Residual Fuel Oil · ST | Jan 1965 | Operating |
| 4 | 632.4 MW 602.1 MW summer | Petroleum Liquids Residual Fuel Oil · ST | Jan 1978 | Operating |
| BESS | 16.7 MW |
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.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
Project milestones and public references behind the asset profile.
EIA-860 lists generator 1 with this operating date.
| 4 |
|---|
| Petroleum Liquids |
| Operating |
| 632.4 |
| Unknown |
| BESS | Batteries | Operating | 16.7 | 10.9 |
|---|
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
EIA-860 lists generator 2 with this operating date.
EIA-860 lists generator 3 with this operating date.
EIA-860 lists generator 4 with this operating date.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
William F Wyman reports 846 MW petroleum + 16.7 MW battery storage of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.
William F Wyman is a Petroleum-fired steam generation plus battery storage facility in Cumberland County, ME, participating in the ISO-NE market.
William F Wyman is in Cumberland County, ME, inside the ISO-NE balancing area.
William F Wyman is operated by FPL Energy Wyman LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
William F Wyman reported 322.7 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.
William F Wyman on the Central Maine Power system.
By capacity, William F Wyman ranks #4 of 726 operating plants of the same technology nationally. It ranks #1 of 3 in ME.
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.