# Carthage Energy LLC NYISO power_plant · https://askthegrid.com/nyiso/assets/plant/carthage-energy-llc Carthage Power Plant is a 62.9 MW natural-gas-fired combined-cycle cogeneration facility in Carthage, Jefferson County, New York. It uses a GE Frame 6 turbine with steam injection for NOx control, a Jeumont Schneider generator set, and a Shin-Nippon steam turbine. The facility began operating in 1991 and can use natural gas, kerosene, or fuel oil as fuel. It was originally developed as a qualifying cogeneration facility serving the James River paper mill with steam and selling electricity to Niagara Mohawk (now National Grid). The plant interconnects at 115 kV and has seasonal DMNC ratings of 55.1 MW in summer and 63.7 MW in winter. ## Key facts - Technology: Natural Gas Fired Combined Cycle - Power capacity: 62.9 MW ## Grid and market context - ISO/RTO: NYISO - Balancing authority: NYISO ## Source-backed facts - Operations.commercial operation date: 1991 year — allianceenergy.net · confidence: review_required - Technical.power mw: 62.9 MW — whit.com.au · confidence: review_required - Operations.interconnection voltage kv: 115 kV — nerc.com · confidence: review_required - Operations.status detail: operating — nerc.com · confidence: review_required - Technical.unit count: 2 count — whit.com.au · confidence: review_required - Identity.canonical name: Carthage Energy LLC — allianceenergy.net · confidence: review_required ## Timeline - 1989-07-21 — Canadian natural gas import application Kamine/Besicorp Carthage L.P. filed an application for authorization to import up to 14,200 Mcf/day of natural gas from Canada, and 104 Bcf total over 20 years, for the new Carthage cogeneration facility. Source: hgeo.energy.gov (https://hgeo.energy.gov/ng_regulation/sites/default/files/programs/gasregulation/authorizations/1990/orders/ord389.pdf) - 1990-03-28 — DOE Order No. 389 granting gas import authorization DOE Opinion and Order No. 389 granted Kamine/Besicorp's application to import Canadian natural gas for the Carthage facility; authorization was for 20-year term commencing upon commercial operation or May 1, 1991, whichever is earlier. Source: hgeo.energy.gov (https://hgeo.energy.gov/ng_regulation/sites/default/files/programs/gasregulation/authorizations/1990/orders/ord389.pdf) - 1991-05-01 — Expected commercial operation Expected completion and commercial operation date for the Carthage cogeneration facility, as stated in the DOE order. Source: hgeo.energy.gov (https://hgeo.energy.gov/ng_regulation/sites/default/files/programs/gasregulation/authorizations/1990/orders/ord389.pdf) - 1999 — Cayuga Energy assumes ownership Cayuga Energy, a wholly owned subsidiary of Iberdrola USA, assumed ownership of Carthage Energy LLC. Source: documents.dps.ny.gov (https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7B8D4D9769-4F71-4F9E-A91C-69984E3E6FA5%7D&DocTitle=Mod%20Fossil%20Divestiture%20Plan%202011_10_21.DOC) - 1999-04-06 — FERC grants EWG status FERC granted Carthage Energy LLC Exempt Wholesale Generator (EWG) status, enabling market-based wholesale power operations. Source: documents.dps.ny.gov (https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7BD148BC34-73B6-4023-B71F-2CB9EF245DF8%7D&DocTitle=IUSA%20Fossil%20Auction%20Section%2070%20Petition) - 2013-03-14 — Retirement notice withdrawn Carthage Energy LLC withdrew its notice of intent to discontinue operation and retire the facility, stating that it no longer intended to discontinue operation or retire the Carthage Energy electric generation facility. Source: documents.dps.ny.gov (https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7B2E7F08B3-53D0-46A1-91EB-38CC25D4FE8E%7D&DocTitle=Withdrawal%20of%20Notice%20of%20Intent%20to%20Discontinue%20Operations%20and%20Retire%20Carthage%20Energy%20Generation%20Facility.) - 2016-10-28 — NERC compliance audit of operations NERC audit of Carthage Energy LLC documented the facility as an operating bulk-system generator interconnected to National Grid at 115 kV, with Alliance Energy Marketing LLC as the operations and maintenance provider. Source: nerc.com (https://www.nerc.com/globalassets/our-work/reports/regional-audit-reports-of-registered-entities/npcc/2017/2016_public_npcc_carthage-energy.pdf) ## Sources - [allianceenergy.net](http://allianceenergy.net/carthage-power-plant.html) — allianceenergy.net · tier public_source - [documents.dps.ny.gov](https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7B2E7F08B3-53D0-46A1-91EB-38CC25D4FE8E%7D&DocTitle=Withdrawal%20of%20Notice%20of%20Intent%20to%20Discontinue%20Operations%20and%20Retire%20Carthage%20Energy%20Generation%20Facility.) — documents.dps.ny.gov · tier authoritative - [documents.dps.ny.gov](https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7B8D4D9769-4F71-4F9E-A91C-69984E3E6FA5%7D&DocTitle=Mod%20Fossil%20Divestiture%20Plan%202011_10_21.DOC) — documents.dps.ny.gov · tier authoritative - [documents.dps.ny.gov](https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7B90B9A09C-0000-C720-B30E-27AF683D69D1%7D&DocTitle=Verified%20Joint%20Petition%20for%20Approval%20of%20Transfer%20of%20Ownership%20Interests) — documents.dps.ny.gov · tier authoritative - [documents.dps.ny.gov](https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7BD148BC34-73B6-4023-B71F-2CB9EF245DF8%7D&DocTitle=IUSA%20Fossil%20Auction%20Section%2070%20Petition) — documents.dps.ny.gov · tier authoritative - [hgeo.energy.gov](https://hgeo.energy.gov/ng_regulation/sites/default/files/programs/gasregulation/authorizations/1990/orders/ord389.pdf) — hgeo.energy.gov · tier authoritative - [gevernova.com](https://www.gevernova.com/gas-power/products/gas-turbines/6b) — gevernova.com · tier public_source - [jeumontelectric.com](https://www.jeumontelectric.com/en/products/synchronous-machines-generators/generators/) — jeumontelectric.com · tier public_source - [nerc.com](https://www.nerc.com/globalassets/our-work/reports/regional-audit-reports-of-registered-entities/npcc/2017/2016_public_npcc_carthage-energy.pdf) — nerc.com · tier public_source - [snm.co.jp](https://www.snm.co.jp/) — snm.co.jp · tier public_source - [whit.com.au](https://www.whit.com.au/generators-in-the-usa-ny/) — whit.com.au · tier public_source ## Data quality - The exact EIA plant identity is supported by the Carthage Energy name, EIA plant ID 10620, Carthage location, 62.9-63 MW capacity, and matching NYISO resource identity. The original DOE record describes a 49.9 MW proposed plant, while later facility records describe approximately 62.9-63 MW; this likely reflects the project's final or later nameplate configuration, but the evidence does not document the specific uprate or expansion event. No authoritative evidence located in the corpus documents a discrete expansion, repowering, turbine replacement, or major capacity-uprate project. The 2013 Alliance transaction is an ownership transfer and should not be reported as a project-financing amount. The public transaction documents do not disclose sale consideration. The 2026 Alliance filing concerns a portfolio transfer that expressly excludes Carthage Energy; it therefore does not establish a sale or change of ownership for this plant. The facility's original cogeneration arrangement is historically documented, while the 2013 filing stated that future operation would not produce useful thermal energy for industrial or commercial purposes. The NERC audit identifies seasonal DMNC ratings of 55.1 MW (summer) and 63.7 MW (winter), while nameplate capacity is reported as 62.9-63 MW. The facility was originally leased from Jefferson County Industrial Development Agency; lease terms and current lessor status are not fully documented in the available evidence. --- Canonical page: https://askthegrid.com/nyiso/assets/plant/carthage-energy-llc Source: Ask the Grid — https://askthegrid.com/