How big is Essential Power Rock Springs LLC?

Essential Power Rock Springs LLC has a reported capacity of 795.6 MW. Source: EIA Form 860.

What kind of plant is Essential Power Rock Springs LLC?

Essential Power Rock Springs LLC is a Natural Gas Fired Combustion Turbine facility in Cecil County, MD, participating in the PJM market.

Where is Essential Power Rock Springs LLC located?

Essential Power Rock Springs LLC is in Cecil County, MD, inside the PJM balancing area.

Who operates Essential Power Rock Springs LLC?

Essential Power Rock Springs LLC is operated by Essential Power Operating Services LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Essential Power Rock Springs LLC generate?

Essential Power Rock Springs LLC reported 179 GWh over the twelve months to 2024-12. Figures are net generation as filed to EIA-923.

Where does Essential Power Rock Springs LLC connect to the grid?

Essential Power Rock Springs LLC interconnects at Rock Springs Substation, on the PECO Energy Company system.

How does Essential Power Rock Springs LLC compare to other plants?

By capacity, Essential Power Rock Springs LLC ranks #29 of 825 operating plants of the same technology nationally. It ranks #1 of 8 in MD.

Essential Power Rock Springs LLC — 796 MW gas plant, MD

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Essential Power Rock Springs LLC — 796 MW gas plant, MD · Ask the Grid

Overview

Reported capacity: 795.6 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Natural Gas Fired Combustion Turbine
Primary generation technology.
Registry anchor: Plant 7835
Essential Power Operating Services LLC · Cecil County · PJM
Operating status: Operating
Essential Power Rock Springs LLC is operating.
Grid connection: Rock Springs Substation
500 kV · PECO Energy Company
Commercial operation: November 2002
Best-supported operating milestone.

Profile

Grid role: Simple-cycle natural-gas peaking generation
Grid connection: Rock Springs Substation · 500 kV · PECO Energy Company.
Physical build: Existing simple-cycle natural-gas facility with four General Electric 7 FA gas turbines (EU-1–EU-4), each nominally rated at 190 MW; two natural-gas-fired heaters rated at 7.5 and 9.0 MMBtu/hr; one 200-hp emergency diesel fire-water pump; and one 100-kW switchyard emergency diesel generator. The permit describes all eight units as operating, with dry low-NOx burners and one discharge stack per turbine.

Structured profile

Reported capacity: 795.6 MW
Natural Gas Fired Combustion Turbine
Commercial operation: November 2002
Operating status: operating
Essential Power Rock Springs LLC is operating.
Interconnection: Rock Springs Substation
500 kV · PECO Energy Company
Location: Cecil County
PJM

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Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
1	198.9 MW 167.3 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	Jun 2003	Operating
2	198.9 MW 164.1 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	Jun 2003	Operating
3	198.9 MW 169 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	Jun 2003	Operating
4	198.9 MW 166.3 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	Jun 2003	Operating

Performance

Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.

Peer context

Technology capacity: 795.6 MW; Natural Gas Fired Combustion Turbine
National rank: #29; of 825 operating peers
MD rank: #1; of 8 operating peers

Monthly generation

Download CSV

Latest 12 months

179 GWh

Reported net generation

Latest report

Dec 2024

EIA-923 monthly filing

2024 capacity factor

2.6%

Using current reported nameplate capacity

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 inventory

ROCK SPRINGS

IN SERVICE · 500 kV

0.2 km

TAP139390

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Land and environmental record

Consumptive Water Use

May 8, 2025

0.262 million gallons per day

SRBC application lists both existing and requested consumptive use as 0.262 MGD (peak-day 30-day average) with projected design year of 2040.

Source

Permitted Equipment Discrepancy

2024

Permit search shows six GE 7FA turbines permitted; four turbines currently operating

MDE issued-permit search result describes facility as permitted for six GE 7FA turbines. Current 2024 renewal and 2025 SRBC application describe four operating air-cooled turbines. Four-unit description reflects current operating configuration; six-unit statement retained as permit-history discrepancy.

Maryland Department of the Environment - Maryland.gov

Site Area

May 11, 2001

Plant occupies approximately 26 acres of a 93-acre site

2001 federal environmental finding states plant occupies approximately 26 acres within 93-acre site.

24099

Transmission Parcel

May 11, 2001

5-acre adjacent parcel for transmission-line span

2001 federal finding identifies 5-acre parcel owned by Rock Springs Generation, LLC adjacent to plant site for short transmission-line span to existing 500-kV line.

24099

Wastewater Treatment

May 8, 2025

Wastewater routed to Wildcat Point for treatment and Susquehanna River discharge

SRBC application states Rock Springs wastewater routed to Wildcat Point for treatment and discharge to Susquehanna River under Wildcat Point's Pennsylvania DEP NPDES permit. Rock Springs NPDES permit number not stated.

Source

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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AssetOwner / operatorOrganization

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Nov 2002
Nov 2002
Commercial operations reported by SRBCSource
The SRBC stated that Rock Springs began commercial operations in November 2002.
Jun 2003
Jun 2003
Generators enter operation

Essential Power Rock Springs LLC