# Holtsville

NYISO power_plant · https://askthegrid.com/nyiso/assets/plant/holtsville

Holtsville is an operating, regulated petroleum-liquids generating facility at 180A Morris Avenue, Holtsville, Suffolk County, New York, comprising ten combustion-turbine generators, each rated at 56.7 MW of nameplate capacity, for an aggregate nameplate capacity of approximately 567 MW. The facility burns kerosene/distillate oil and connects to NYISO through LMP node designations 23690 through 23699, interconnecting at 138 kV via the West Bus/Holbrook local transmission-owner substation. It is owned and operated by National Grid Generation LLC and serves as a peaking resource on Long Island. The facility remains listed as operating in NYISO's existing-generating-facilities tables and is subject to New York State environmental permitting and RGGI compliance requirements.

## Key facts

- Technology: Petroleum Liquids
- Power capacity: 567 MW

## Grid and market context

- ISO/RTO: NYISO
- Balancing authority: NYISO

## Source-backed facts

- Interconnection.settlement point: Holtsville 103 — nyiso.com · confidence: review_required
- Regulatory.dec facility id: 1472200105 — extapps.dec.ny.gov · confidence: review_required

## Timeline

- 1998-05-28 — LILCO/LIPA restructuring; LILCO generation assets transferred to KeySpan
  LILCO's non-nuclear generation assets (including Holtsville) were transferred to KeySpan subsidiaries; LIPA retained the transmission and distribution system. KeySpan issued approximately $1.048 billion of promissory notes to LIPA. LIPA financed the broader merger with approximately $6.73 billion of revenue bonds. The cited amounts cover portfolio-level financing and debt refinancing, not Holtsville-specific project financing.
  Source: lipower.org (https://www.lipower.org/)
- 2007-08-24 — National Grid plc acquires KeySpan; Holtsville becomes part of National Grid USA portfolio
  National Grid plc completed acquisition of KeySpan Corporation. National Grid Generation (formerly KeySpan Generation) continued as a wholly owned subsidiary of KeySpan and an indirect subsidiary of National Grid USA.
  Source: nationalgrid.com (https://www.nationalgrid.com/sites/default/files/documents/ngy09-nationalgridgenerationmarch312009pdfadobeacrobat.pdf)
- 2009-01-01 — Holtsville enrolled in RGGI compliance program
  Holtsville Facility recorded in RGGI (Regional Greenhouse Gas Initiative) compliance system under ORIS 8007 and New York DEC facility ID 1472200105. Compliance account marked 'In Compliance' for 2009–2011 control period.
  Source: foleyhoag.com (https://foleyhoag.com/getmedia/552f31b1-1c87-4b70-bfba-6bb9d176d393/RGGI-Compliance-Report-2012.pdf)

## Sources

- [nationalgrid.com](http://nationalgrid.com/sites/default/files/documents/ngy08-gencomarch2008.pdf) — nationalgrid.com · tier public_source
- [climate.ny.gov](https://climate.ny.gov/-/media/Project/Climate/Files/JTWG-Power-Plant-Inventory.pdf) — climate.ny.gov · tier authoritative
- [extapps.dec.ny.gov](https://extapps.dec.ny.gov/data/dar/afs/permits/prr_147220010500022_r3.pdf) — extapps.dec.ny.gov · tier authoritative
- [foleyhoag.com](https://foleyhoag.com/getmedia/552f31b1-1c87-4b70-bfba-6bb9d176d393/RGGI-Compliance-Report-2012.pdf) — foleyhoag.com · tier public_source
- [pragmaticenvironmentalistofnewyork.blog](https://pragmaticenvironmentalistofnewyork.blog/wp-content/uploads/2025/10/long-island-power-genration-ar-323-1.pdf) — pragmaticenvironmentalistofnewyork.blog · tier public_source
- [lipower.org](https://www.lipower.org/) — lipower.org · tier public_source
- [nationalgrid.com](https://www.nationalgrid.com/sites/default/files/documents/ngy09-nationalgridgenerationmarch312009pdfadobeacrobat.pdf) — nationalgrid.com · tier public_source
- [nyiso.com](https://www.nyiso.com/documents/20142/2226333/2023-Gold-Book-Public.pdf) — nyiso.com · tier authoritative

## Data quality

- The unit count, nameplate ratings, fuel type, prime movers, in-service dates, and operating status are confirmed across multiple authoritative sources (EIA-860, NYISO Gold Book 2024, New York state inventory, and regulatory permits). Ownership history is well-documented: LILCO → KeySpan (May 1998) → National Grid (August 2007). No plant-specific project-financing package or construction debt was identified. The 1998 transaction involved portfolio-level financing ($1.048 billion KeySpan promissory notes; $6.73 billion LIPA bonds for merger and refinancing). The facility remains listed as operating in NYISO's 2024 existing-generating-facilities table; no deactivation or repowering project is recorded. National Grid's 2026 infrastructure upgrade project concerns facility upgrades and ancillary improvements (compressor system, power distribution center, heating system, tank stairs), not generation-capacity expansion or repowering. Holtsville is a peaking resource on Long Island operating under LIPA transmission-owner contracts and NYISO market participation. DEC and NYISO maintain current regulatory records. The facility is associated with a 'Holtsville GT & Ling' designation in some regulatory documents, acknowledging an adjacent or integrated LNG facility. This assessment is limited to EIA plant 8007 (the generation asset) and does not conflate it with non-thermal assets.
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