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.
Overview
Key fields
- Nameplate capacity
- 567 MW
Canonical EIA plant baseline.
- Registry anchor
- Plant 8007
plant-8007
Structured profile
- Technology
- Petroleum Liquids
- Operator
- National Grid Generation LLC
Units and generators
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 56.7 MW 55.5 MW summer | Petroleum Liquids Kerosene · GT | Jul 1974 | Operating |
| 10 | 56.7 MW 54.1 MW summer | Petroleum Liquids Kerosene · GT | Jul 1975 | Operating |
| 2 | 56.7 MW 55.6 MW summer | Petroleum Liquids Kerosene · GT | Jul 1974 | Operating |
| 3 | 56.7 MW 51 MW summer | Petroleum Liquids Kerosene · GT | Jul 1974 | Operating |
| 4 | 56.7 MW 52.4 MW summer | Petroleum Liquids Kerosene · GT | Jul 1974 | Operating |
| 5 | 56.7 MW 53.4 MW summer | Petroleum Liquids Kerosene · GT | Jul 1974 | Operating |
| 6 | 56.7 MW 50.4 MW summer | Petroleum Liquids Kerosene · GT | Jul 1975 | Operating |
| 7 | 56.7 MW 49.2 MW summer | Petroleum Liquids Kerosene · GT | Jul 1975 | Operating |
| 8 | 56.7 MW 55.4 MW summer | Petroleum Liquids Kerosene · GT | Jul 1975 | Operating |
| 9 | 56.7 MW 55.3 MW summer | Petroleum Liquids Kerosene · GT | Jul 1975 | Operating |
Performance
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Peer context
- Technology capacity
- 567 MW
- National rank
- #7
- NY rank
- #2
Monthly generation
Download CSVMonthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
Grid and market context
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Nearby substations
HIFLD infrastructure inventoryCommercial, land, and environmental record
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Transactions and agreements
Related parties and identifiers
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
Relationship graph
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Parties and identifiers
| Relationship | Entity | Basis |
|---|---|---|
| Former owner | Former owner (pre-1998) | |
| Owner / operator | KeySpan Generation LLC | Owner/operator 1998–2007 |
| Transmission owner / regulatory counterparty | Transmission/distribution owner; regulatory counterparty | |
| Regulator | Environmental regulator and permit issuer | |
| Grid selection | plant:plant-8007 | Canonical asset page /nyiso/assets/plant/holtsville. |
Reporting portfolio
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Northport | 1,564 MW | NY | |
| E F Barrett | 669.2 MW | NY | |
| HoltsvilleCurrent | 567 MW | NY | |
| Port Jefferson | 498 MW | NY | |
| Wading River | 238.5 MW | NY | |
| Glenwood | 110 MW | NY | |
| Glenwood Landing | 106 MW | NY | |
| Shoreham | 71.5 MW | NY |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioTimeline and sources
Project milestones and public references behind the asset profile.
Project timeline
- Generators enter operationEIA-860
EIA-860 lists generator 1, generator 2, generator 3, generator 4, generator 5 with this operating date.
- Generators enter operationEIA-860
EIA-860 lists generator 10, generator 6, generator 7, generator 8, generator 9 with this operating date.
- LILCO/LIPA restructuring; LILCO generation assets transferred to KeySpanlipower.org
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.
- National Grid plc acquires KeySpan; Holtsville becomes part of National…nationalgri...
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.
- Holtsville enrolled in RGGI compliance programfoleyhoag.c...
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.
Sources
Common questions about Holtsville
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
How big is Holtsville?
Holtsville has a reported capacity of 567 MW. Source: EIA Form 860M.
What kind of plant is Holtsville?
Holtsville is a Petroleum Liquids facility in Suffolk County, NY, participating in the NYISO market.
Where is Holtsville located?
Holtsville is in Suffolk County, NY, inside the NYISO balancing area.
Who operates Holtsville?
Holtsville is operated by National Grid Generation LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
How much electricity does Holtsville generate?
Holtsville reported 21.3 GWh over the twelve months to 2024-12. Figures are net generation as filed to EIA-923.
How does Holtsville compare to other plants?
By capacity, Holtsville ranks #7 of 705 operating plants of the same technology nationally. It ranks #2 of 25 in NY.
Co-located assets
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.
Related assets
Similar plants ranked by technology, capacity, and distance.