How big is Midway Sunset Cogen?

Midway Sunset Cogen has a reported capacity of 234 MW. Source: EIA Form 860.

What kind of plant is Midway Sunset Cogen?

Midway Sunset Cogen is a Natural Gas Fired Combustion Turbine facility in Kern County, CA, participating in the CAISO market.

Where is Midway Sunset Cogen located?

Midway Sunset Cogen is in Kern County, CA, inside the CAISO balancing area.

Who operates Midway Sunset Cogen?

Midway Sunset Cogen is operated by Midway-Sunset Cogeneration Co according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Midway Sunset Cogen generate?

Midway Sunset Cogen reported 6 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.

How does Midway Sunset Cogen compare to other plants?

By capacity, Midway Sunset Cogen ranks #228 of 825 operating plants of the same technology nationally. It ranks #12 of 136 in CA.

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Natural Gas Fired Combustion TurbineCAISO · Kern County

Midway Sunset Cogen

Middle River Power · Kern County · CAISO

Midway Sunset Cogen is a natural gas-fired power facility with 234 MW of EIA-reported nameplate capacity in Kern County, California, registered as EIA Plant ID 52169. Midway-Sunset Cogeneration Co is the registered plant entity or operator. Commercial operation began on May 1, 1989.

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Overview

Key fields

Reported capacity: 234 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Natural Gas Fired Combustion Turbine
Primary generation technology.
Registry anchor: Plant 52169
Midway-Sunset Cogeneration Co · Kern County · CAISO
Operating status: Operating

Asset analyst

plant:plant-52169

Ask about Midway Sunset Cogen

Investigate technology, capacity, output, price behavior, ownership, and related facilities using this profile plus current grid data.

Units and generators

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

Generator	Capacity	Technology	Operation	Status
A	78 MW 73 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	May 1989	Operating
B	78 MW 73 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	May 1989	Operating
C	78 MW 73 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	May 1989	Operating

Commercial, 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

Original Power Purchase Agreement

Dec 14, 1989

Original PPA between MSCC and PG&E identified as PG&E Log No. 25C321. No agreement duration, capacity, or amount disclosed.

Midway Sunset Cogeneration Company · Pacific Gas and Electric Company

Source

PPA Assumption And Claims Compromise

Nov 30, 2002

Effective-date agreement documenting PG&E's assumption of existing Midway Sunset PPA and compromise of related claims during PG&E bankruptcy proceedings effective November 30, 2002. No transaction amount, duration, or contracted MW disclosed.

Midway Sunset Cogeneration Company · Pacific Gas and Electric Company

Source

Ownership Interest Acquisition

Apr 2014

NRG Energy acquired substantially all EME assets including EME's 50% ownership in MSCC. CEC recorded closing as April 1, 2014. Transaction did not change direct project ownership or operational control.

NRG Energy, Inc. · Edison Mission Energy · Midway Sunset Cogeneration Company

DOCKETED

Reliability Must-Run Service Agreement

Feb 1, 2021

RMR service agreement filed after prior PPAs terminated on September 30, 2020 (Turbine C) and December 31, 2020 (Turbines A and B). Effective date February 1, 2021. No contracted MW or payment amount disclosed in filing.

Midway Sunset Cogeneration Company · California Independent System Operator Corporation

Source

Resource Adequacy Offtake Contracts

Aug 31, 2022

CAISO reported that MSCC units entered resource adequacy contracts for full available capacity through 2026, eliminating RMR contract need. Load-serving-entity counterparties and exact capacity not identified.

Midway Sunset Cogeneration Company

Source

Land and environmental record

Air Permit

2024

Permit No. SJVAPCD Permits to Operate S-1135-224, S-1135-225, and S-1135-226 for Units A, B, and C

Three natural-gas-fired combustion turbine generators authorized under these permit-to-operate numbers for Units A, B, and C per 2024 annual operating report.

ANNUAL COMPLIANCE REPORT- 2024 - Part 1

Air Permit Modification

2021

Authorities to Construct S-1135-224, S-1135-225, and S-1135-226 issued for turbine modifications

SJVAPCD notice identifies Aera Energy LLC (dba Midway Sunset Cogeneration Co.) and states gas turbine engines S-1135-224, -225, and -226 were modified.

Notice in English for Posting on Valleyair.org NOTICE OF FINAL DECISION FOR THE ISSUANCE OF AUTHORITY TO CONSTRUCT AND SIGNIFICANT

Emissions Controls And Process Equipment

Three nominal 78.2 MW combustion turbines with dry-low-NOx combustors, SCR, and unfired HRSGs

SJVAPCD variance record describes three 78.2 MW combustion turbine generators equipped with dry-low-NOx combustors, selective catalytic reduction, and unfired heat-recovery steam generators.

Attachment A - SQVAPCD Order Granting a Regular Variance

Environmental Compliance

2024

2024 Title V six-month and annual compliance certifications submitted to EPA and SJVAPCD

2024 annual operating report states Title V certifications were submitted and no spill reports were required for 2024.

ANNUAL COMPLIANCE REPORT- 2024 - Part 1

Wastewater And Waste Management

2024

Brine and on-site water-treatment waste routed for underground injection and/or evaporation-pond disposal

2024 annual report: all brine water underground-injected through Aera Energy to Valley Water under EPA, DOGGR, and California Regional Water Quality Control Board approval. On-site water-treatment waste neutralized, combined with Aera's waste, and disposed of by Valley Water through underground injection and/or evaporation ponds.

ANNUAL COMPLIANCE REPORT- 2024 - Part 1

Overview

Key fields

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Overview

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Units and generators

Performance

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Monthly generation

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Commercial, land, and environmental record

Transactions and agreements

Land and environmental record

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Timeline and sources

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Common questions about Midway Sunset Cogen

How big is Midway Sunset Cogen?

What kind of plant is Midway Sunset Cogen?

Where is Midway Sunset Cogen located?

Who operates Midway Sunset Cogen?

How much electricity does Midway Sunset Cogen generate?

How does Midway Sunset Cogen compare to other plants?

Co-located assets

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