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Long Island Community Microgrid Project in East Hampton

Current status, energy mix, organizations, suppliers, equipment, controls, reported specifications, and project updates—with source-level citations.

CoverageDetailed public record
Named organizations12
System facts31
Sources reviewed11
Evidence reviewed2026-07-20

The Long Island Community Microgrid Project (LICMP) was Clean Coalition's NY Prize Stage 1 concept around PSEG Long Island's East Hampton GT substation: 15 MWdc of distributed solar, a centralized 5 MW/25 MWh battery, smaller facility batteries, and existing diesel peakers would serve 3,343 accounts and priority community facilities. The modeled solar fleet could supply roughly half of the study area's annual electricity. LICMP did not advance to an NY Prize Stage 2 award and was not built in this form.

Research status
Feasibility study completed in 2016; unbuilt. LICMP appears on NYSERDA's Stage 1 award roster but not the official Stage 2 list. A separate 76 kW solar/60 kW battery project at East Hampton Town Hall entered service in January 2023; it is not a reduced or commissioned phase of the 15 MW/25 MWh LICMP and must not be merged into this record.
Historical classification
Building
Reported capacity
See component specifications
Coordinates
40.95867, -72.25266
Evidence note: “Every company” cannot be proven from public material alone. This page lists every organization found in the recovered record and reviewed sources, preserves unknown roles, and explicitly marks undisclosed controller or equipment details.
Report missing evidenceResearch methodology

Project delivery

Who was involved in Long Island Community Microgrid Project in East Hampton?

12 publicly identified organizations. Where a recovered source named a participant without explaining its work, the role remains explicitly unspecified.

Organization

Clean Coalition

Project proposer and technical lead for the LICMP feasibility design [6][7]

Organization

Industrial Economics, Inc.

Prepared the standardized NY Prize benefit-cost evaluation [6]

Organization

LIPA

Publicly named participant; role not specified in the recovered record [1]

Organization

Long Island Power Authority

Owner of the Long Island electric system and utility-policy stakeholder [6]

Organization

National Renewable Energy Laboratory

Provided JEDI employment/economic-impact modeling [6]

Organization

New York Power Authority

Developer of the separate Town Hall solar-plus-storage project energized in 2023, not the LICMP [10]

Organization

NYSERDA

NY Prize Stage 1 funder and program administrator [6][8][9]

Organization

PSEG

Publicly named participant; role not specified in the recovered record [1]

Organization

PSEG Long Island

Distribution-system operator, proposed microgrid-controls owner/operator, and procurement/interconnection partner [6]

Organization

Springs Fire District

Proposed critical-load and emergency-response host [6]

Organization

Suffolk County Water Authority

Proposed critical-load host for two water facilities [6]

Organization

Town of East Hampton

NY Prize applicant, community sponsor, and proposed critical-facility partner [6][8]

System evidence

Energy mix, capacity, and specifications

Values can describe different project phases, generation sources, storage systems, or other components. Source citations are attached to each figure so discrepancies remain visible.

Storage
NA [1]
Proposed solar
15 MWdc distributed across the study area: 10 MW already contemplated through separate feed-in-tariff procurement plus 5 MW of additional PV enabled by storage [6][7]
Central battery
5 MW / 25 MWh, five-hour duration, proposed on the low-voltage side of East Hampton substation Bank 4 [6]
Distributed storage
Additional smaller batteries at critical facilities; sizes, chemistry, and manufacturers were not finalized [6]
Existing dispatchable generation
6 MW of distillate-fueled peaking generation at the substation, consisting of three 2 MW units, plus separate facility backup generators [6]
Customers served
3,343 utility accounts, representing roughly 10,000 residents and employees in the microgrid area [6]
Annual solar contribution
The 15 MW portfolio was modeled to provide approximately 50% of annual electricity consumed within the LICMP area [6]
Peak-load reduction
5 MW of storage plus approximately 3 MW effective coincident PV contribution, for an 8 MW modeled peak reduction [6]
Avoided infrastructure
Study proponents estimated approximately US$38 million in avoided transmission investment [6][7]
Project cost
Approximately US$40.4 million including the optional additional 5 MW of PV, or US$27.6 million without it, in the feasibility estimate [6]
Emissions result
More than 7 million pounds of annual carbon-dioxide reduction projected; this was a model result, not measured performance [6]

Controls and hardware

Equipment and controller details

Manufacturer and model are shown only when a source names them. Generic descriptions are not converted into guessed product assignments.

01

Photovoltaics

Model not publicly disclosed

Multiple distributed systems totaling 15 MWdc; individual host sites, module makers, and inverter models were to be determined through procurement [6]

02

Central battery storage

Model not publicly disclosed

Proposed 5 MW / 25 MWh substation-sited system. Chemistry and vendor were not selected in the feasibility report [6]

03

Facility batteries

Model not publicly disclosed

Smaller distributed systems proposed at priority facilities to support local islanding and black start; final sizes were not defined [6]

04

Existing peaking generators

Model not publicly disclosed

Three existing 2 MW distillate-oil units at the East Hampton GT substation, reserved primarily for resilience in the concept [6]

05

Microgrid control

Model not publicly disclosed

Conceptual monitoring, communications, and control platform, called MC2 in the report, integrated with PSEG Long Island smart-grid systems; vendor and model were not finalized [6]

06

Advanced inverters

Model not publicly disclosed

PV and storage inverters were expected to provide voltage and reactive-power support and participate in coordinated island operation [6]

07

Separate Town Hall project

Model not publicly disclosed

The 2023 municipal installation comprises 76 kW of rooftop PV and a 60 kW battery; it is documented here only to prevent project conflation [10]

Technical record

Architecture, performance, and project updates

Concise technical facts, milestones, operating results, and later developments. Dated notes distinguish historical design claims from current evidence.

  • General

    Technology would include up to 15 MW of local solar, a 25-MWh energy storage system, and other distributed energy resources (DER). [1]

  • General

    The Long Island Community Microgrid Project will provision about 50% of its grid-area electric power requirements from local solar. [1]

  • General

    The result will be an optimized local energy system combining up to 15 megawatts (MW) of solar power with a 25-megawatt-hour energy storage system. [1]

  • Generation

    Technology would include up to 15 MW of local solar, a 25-MWh energy storage system, and other distributed energy resources (DER). [1]

  • Generation

    Through this effort, we uncovered over 30 potential sites for solar PV installations, with a collective capacity of than 32 megawatts (MW). [1]

  • Topology

    The proposed microgrid centered on East Hampton GT substation Bank 4 and two distribution feeders, combining a large centralized battery with distributed PV and critical-facility resources. [6]

  • Critical loads

    Priority sites included two Suffolk County Water Authority plants and the Springs Fire District; the architecture allowed expansion to airport and other emergency-service facilities. [6]

  • Resilience modes

    The design called for feeder- or transmission-outage islanding, black start, tiered load priorities, and continued autonomous operation if communications with higher-level systems failed. [6]

  • Controls

    MC2 would use load, PV, weather, battery, and cost forecasts to schedule resources, manage state of charge, coordinate protection, and minimize use of diesel generators. [6]

  • Energy mix

    The feasibility model's approximately 50% annual solar share was prospective. Grid power would supply most of the balance in normal operation, while storage shifts solar and existing diesel provides emergency firm capacity. [6]

  • Economic interpretation

    Clean Coalition's analysis emphasized transmission deferral, resilience, and jobs, while the NY Prize standardized methodology tested different assumptions. All figures are planning estimates because the project was not constructed. [6][7]

  • Outcome

    LICMP is listed among Stage 1 winners but not among NYSERDA's eleven Stage 2 awards; the unbuilt classification is therefore an evidence-based inference from official program records. [8][9]

  • Project disambiguation

    The 2023 Town Hall system was developed separately by NYPA and Inclusive Prosperity Capital. Its 76 kW/60 kW scale and municipal-building scope are not evidence that the 15 MW LICMP was commissioned. [10]

Provenance

11 sources

Primary owner, government, university, supplier, and engineering sources are preferred. Archived references preserve claims whose original pages moved or disappeared.

  1. [1]
    Recovered Microgrid Projects record

    Internet Archive · Archived source · captured 2021-04-20

  2. [2]
    www.clean-coalition.org

    clean-coalition.org · Archived source · captured 2021-04-20

  3. [3]
    Read More

    clean-coalition.org · Archived source · captured 2021-04-20

  4. [4]
    Clean Coalition

    clean-coalition.org · Archived source · captured 2021-04-20

  5. [5]
    Project PDF

    clean-coalition.org · Archived source · captured 2021-04-20

  6. [6]
    Long Island Community Microgrid Project – NY Prize Stage 1 Feasibility Study

    NYSERDA / Town of East Hampton / Clean Coalition · Primary source

  7. [7]
    Final LICMP Feasibility Report

    Clean Coalition · Primary source

  8. [8]
    NY Prize Stage 1 Award Winners

    NYSERDA · Primary source

  9. [9]
    NY Prize Stage 2 Awarded Projects

    NYSERDA · Primary source

  10. [10]
    East Hampton Solar Plus Storage Project Operational

    New York Power Authority · Primary source

  11. [11]
    Long Island Community Microgrid Project in East Hampton (archived legacy record)

    Microgrid Projects / Internet Archive · Archived source

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