Glenwood Landing
National Grid Generation LLC - Nassau County - NYISO
Glenwood Landing (EIA plant 7869) is a 106 MW natural-gas and distillate-oil fired combustion-turbine generation facility located at 400 Shore Road, Glenwood Landing, Nassau County, New York. The two LM6000 natural-gas turbines are equipped with selective catalytic reduction and water/steam injection for NOx control. Annual generation in 2024 was 129.2 GWh with fuel mix of 84.2% natural gas and 15.8% distillate fuel oil. National Grid decommissioned the broader Glenwood Landing generating site between 2011 and June 2015 under an approved plan managed by TRC Companies; however, the two LM6000 units continued operating or remained available for dispatch, with resources running continuously for approximately 168 hours in March 2026.
Overview
Key fields
- Nameplate capacity
- 106 MW
Canonical EIA plant baseline.
- Registry anchor
- Plant 7869
plant-7869
Structured profile
- Technology
- Natural Gas Fired Combustion Turbine
- Operator
- National Grid Generation LLC
Units and generators
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| GT1 | 16 MW 12.6 MW summer | Petroleum Liquids Disillate Fuel Oil · GT | Apr 1967 | Operating |
| GT4 | 53 MW 42.6 MW summer | Natural Gas Fired Combustion Turbine Natural Gas · GT | Jun 2002 | Operating |
| GT5 | 53 MW 42.5 MW summer | Natural Gas Fired Combustion Turbine Natural Gas · GT | Jun 2002 | Operating |
Performance
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Peer context
- Technology capacity
- 106 MW
- National rank
- #360
- NY rank
- #6
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 |
|---|---|---|
| Parent company | National Grid USA | Parent company of National Grid Generation LLC |
| Parent company | National Grid plc | Ultimate parent company via KeySpan merger |
| Former owner | Long Island Lighting Company | Predecessor owner prior to 1998 transfer to National Grid Generation |
| Former owner | KeySpan Corporation | Owner via Glenwood Energy Center subsidiary until 2007 merger |
| Construction contractor | Owner's engineer and decommissioning contractor | |
| Regulator | Federal regulator and market authority | |
| Regulator | New York State Division of Environmental Conservation | Air quality regulator and permit authority |
| Equipment supplier | Manufacturer of LM6000 turbines | |
| Grid selection | plant:plant-7869 | Canonical asset page /nyiso/assets/plant/glenwood-landing. |
Reporting portfolio
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Northport | 1,564 MW | NY | |
| E F Barrett | 669.2 MW | NY | |
| Holtsville | 567 MW | NY | |
| Port Jefferson | 498 MW | NY | |
| Wading River | 238.5 MW | NY | |
| Glenwood | 110 MW | NY | |
| Glenwood LandingCurrent | 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
- Generator enters operationEIA-860
EIA-860 lists generator GT1 with this operating date.
- Acquisition of LILCO Non-Nuclear Generation Assetsdocuments.d...
National Grid Generation (formerly MarketSpan LLC and KeySpan Generation LLC) acquired LILCO's non-nuclear generation assets including Glenwood Landing as part of a restructuring transaction involving KeySpan Corporation and Long Island Power Authority
- Generators enter operationEIA-860
EIA-860 lists generator GT4, generator GT5 with this operating date.
- National Grid Merger with KeySpan Corporationnationalgri...
National Grid plc completed its merger with KeySpan Corporation, bringing the Glenwood Landing generation business under National Grid ownership. Approximately $7.6 billion aggregate consideration paid; KeySpan shares converted into cash at $42.00 per share
- Decommissioning Project Contract Awardtrccompanie...
TRC Companies awarded contract for owner's engineering services for the decommissioning, demolition, and restoration of the Glenwood Landing Generating Site; scope includes program management, structural surveys, asbestos and regulated material surveys, environmental assessment, power delivery engineering, permitting, closure of cooling water structures, and construction oversight
- Decommissioning Project Completiontrccompanie...
TRC Companies completion of owner's engineering services and decommissioning project for the Glenwood Landing Generating Site; approximately 200 MW generating facility decommissioned in accordance with approved plans
- Continuous Operation Reportnewsday.com
Newsday reports that Glenwood Landing peaker cluster ran continuously for approximately 168 hours, indicating active dispatch during winter peak demand period on Long Island
Sources
Common questions about Glenwood Landing
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
How big is Glenwood Landing?
Glenwood Landing has a reported capacity of 106 MW. Source: EIA Form 860M.
What kind of plant is Glenwood Landing?
Glenwood Landing is a Natural Gas Fired Combustion Turbine facility in Nassau County, NY, participating in the NYISO market.
Where is Glenwood Landing located?
Glenwood Landing is in Nassau County, NY, inside the NYISO balancing area.
Who operates Glenwood Landing?
Glenwood Landing 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 Glenwood Landing generate?
Glenwood Landing reported 129.2 GWh over the twelve months to 2024-12. Figures are net generation as filed to EIA-923.
How does Glenwood Landing compare to other plants?
By capacity, Glenwood Landing ranks #360 of 825 operating plants of the same technology nationally. It ranks #6 of 31 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.
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