# Holtsville

NYISO asset profile · https://askthegrid.com/assets/facilities/holtsville

National Grid Generation LLC - Suffolk County - NYISO

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.

## Metrics

- **Nameplate capacity:** 567 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 8007 — plant-8007

## Facts

- **Technology:** Petroleum Liquids
- **Operator:** National Grid Generation LLC

## Related parties

- **Former owner:** Long Island Lighting Company (LILCO) — Former owner (pre-1998) ([source](https://www.lipower.org/))
- **Owner / operator:** KeySpan Generation LLC — Owner/operator 1998–2007
- **Transmission owner / regulatory counterparty:** Long Island Power Authority (LIPA) — Transmission/distribution owner; regulatory counterparty ([source](https://www.lipower.org/))
- **Regulator:** New York State Department of Environmental Conservation (DEC) — Environmental regulator and permit issuer ([source](https://dec.ny.gov/))

## Sources

- [nationalgrid.com](http://nationalgrid.com/sites/default/files/documents/ngy08-gencomarch2008.pdf) — nationalgrid.com · public_source — Source retained for exact-record publication review.
- [climate.ny.gov](https://climate.ny.gov/-/media/Project/Climate/Files/JTWG-Power-Plant-Inventory.pdf) — climate.ny.gov · authoritative — Source retained for exact-record publication review.
- [extapps.dec.ny.gov](https://extapps.dec.ny.gov/data/dar/afs/permits/prr_147220010500022_r3.pdf) — extapps.dec.ny.gov · authoritative — Source retained for exact-record publication review.
- [foleyhoag.com](https://foleyhoag.com/getmedia/552f31b1-1c87-4b70-bfba-6bb9d176d393/RGGI-Compliance-Report-2012.pdf) — foleyhoag.com · public_source — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/holtsville
Website: [National Grid Generation LLC](https://www.nationalgridus.com/construction-projects/Community-Projects/Holtsville/About)

Source: Ask the Grid — https://askthegrid.com/