Public Service Company of Oklahoma (PSO) has broken ground on a 450-megawatt natural gas generation project at its Northeastern Energy Campus near Oologah, Oklahoma, advancing a major addition to the utility’s electricity supply as it prepares for rising demand across its service territory.
The Northeastern Units 5 and 6 project will install two General Electric combustion gas turbines in a simple-cycle configuration, adding 450 MW of dispatchable capacity to PSO’s generation fleet. The utility expects the units to enter commercial operation in December 2028.
PSO announced the construction start on November 9, 2026, and confirmed that Energy Transfer won a competitive bidding process to support natural gas delivery to the new units. The project will expand an established generation campus in Rogers County rather than create an entirely new power plant site.
The estimated capital cost in PSO’s regulatory filings is approximately $539.8 million, covering direct project costs, indirect costs and owner expenses.
$540 million project follows regulatory and local opposition
The construction milestone follows a lengthy approval process that included opposition from Rogers County officials. In November 2025, the county’s Board of Adjustment denied PSO’s request for a special exception covering proposed utility structures at the Northeastern site. The dispute led PSO to file lawsuits challenging the county’s authority to restrict development on the utility-owned property.
PSO argued that it had owned the site since 1960 and that county officials lacked jurisdiction over its use for electricity generation and related facilities. The dispute became a significant obstacle because the Oklahoma Corporation Commission’s May 2026 approval tied PSO’s ability to recover construction costs for Units 5 and 6 to obtaining the necessary zoning approval through a final, non-appealable court order.
PSO’s November 9 announcement confirms that construction is now underway, but it does not explain how the zoning dispute was resolved or provide an update on the related court proceedings.
The Oklahoma Corporation Commission approved PSO’s wider generation portfolio in May through Case No. PUD2025-000064. The approximately $1.2 billion portfolio includes two natural gas generation projects, three battery energy storage systems and agreements for additional wind and gas capacity. Units 5 and 6 form part of that wider plan to add approximately 1,300 MW of generation resources.
The commission’s decision also allowed construction-work-in-progress (CWIP) cost recovery for eligible project expenses, subject to conditions. CWIP permits a utility to recover approved construction costs from customers before a generating facility enters service. The approach has drawn scrutiny from consumer advocates and other parties concerned about shifting construction and investment risks to electricity customers.
The wider preapproval order also faced an appeal to the Oklahoma Supreme Court. The regulatory approval therefore does not mean every financing and customer-cost question surrounding PSO’s expansion has disappeared.
New turbines address forecast capacity shortfalls
PSO sought regulatory approval for additional generation after forecasting that its available summer capacity would fall short of its planning requirements in the coming years without new resources.
In its regulatory application, the utility projected a capacity deficit of 10 MW in 2027, 470 MW in 2028 and 1,766 MW in 2029. These are planning forecasts rather than evidence of current electricity shortages, but they illustrate the scale of the capacity gap PSO expects to address.
The two Northeastern turbines will provide dispatchable generation, allowing PSO to call on the units when electricity demand rises or other generation resources are unavailable. Their simple-cycle configuration prioritizes operational flexibility and the ability to respond to changing demand.
The project is also part of a broader shift in how utilities are preparing for larger electricity loads. Industrial developments, new businesses and other large electricity users are increasing pressure on regional power systems to secure additional capacity. PSO’s wider generation plan reflects that challenge, combining gas-fired generation with battery storage and contracted power resources.
The company has not identified how much of the new capacity will serve particular customers or disclosed a project-specific allocation for anticipated large-load demand.
Energy Transfer selected for natural gas infrastructure
Energy Transfer’s selection is another important development because the new turbines will require a dependable natural gas supply to operate.
American Electric Power, PSO’s parent company, previously sought proposals for a pipeline lateral and associated gas facilities to serve the Northeastern Units 5 and 6 project. The procurement also included requests for firm transportation capacity on the mainline pipeline system.
The November announcement confirms Energy Transfer’s selection through a competitive process, but does not disclose the contract value, pipeline length, transportation volumes or the precise division of construction and operating responsibilities.
Those details remain important to understanding the project’s full infrastructure requirements. The generating units themselves are only one part of the development: fuel delivery capacity must also be available when PSO needs the turbines to operate, particularly during periods of high electricity demand.
PSO has also not disclosed the expected annual natural gas consumption or the project’s emissions profile in its latest construction announcement.
Oklahoma gas expansion reflects wider U.S. generation investment
PSO’s project is part of a wider wave of natural gas generation development across the United States as utilities and independent power producers seek dispatchable capacity to support growing electricity demand.
A comparable development is Hallador Energy’s proposed 460 MW Turtle Creek Gas project at its existing Merom Generating Station in Indiana. Hallador is targeting a final investment decision before the end of 2026 and commercial operation in the second half of 2028.
The two projects illustrate different approaches to adding gas-fired generation. PSO is advancing a utility-owned project through a regulated generation portfolio, while Hallador is developing a new facility at an existing power station through a separate financing and investment process. Hallador’s project also highlights the capital, equipment procurement and grid-interconnection work that can remain outstanding even after major equipment purchases and financing commitments.
Commercial operation targeted for December 2028
PSO expects Northeastern Units 5 and 6 to enter commercial operation in December 2028. The schedule leaves approximately two years for construction, installation, commissioning and completion of the associated gas-delivery infrastructure.
The project will also contribute to the local tax base. PSO expects Units 5 and 6, together with its separate Northeastern 7 battery energy storage project, to generate additional property tax revenue for Rogers County schools and other public services over their operating lives. The company has not provided a specific annual revenue estimate.
The next important milestones include completing the gas infrastructure, advancing turbine installation and confirming the project’s progress against its 2028 operating target. Greater disclosure of the Energy Transfer agreement, final construction costs and the resolution of the earlier zoning dispute would provide a clearer picture of the project’s remaining risks.
For PSO, the construction start marks a significant step toward adding 450 MW of dispatchable capacity. The remaining challenge is to deliver the facility on schedule while managing the infrastructure, regulatory and customer-cost issues that accompanied its approval.
Project factsheet: Northeastern Units 5 and 6
- Developer/owner: Public Service Company of Oklahoma (PSO)
- Parent company: American Electric Power
- Location: Northeastern Energy Campus, near Oologah, Rogers County, Oklahoma
- Technology: Natural gas-fired simple-cycle generation
- Generating equipment: Two General Electric combustion gas turbines
- Combined capacity: 450 MW
- Estimated capital cost: Approximately $539.8 million
- Gas infrastructure provider selected: Energy Transfer
- Construction start: November 2026
- Expected commercial operation: December 2028
- Wider PSO generation portfolio: Approximately 1,300 MW of new generation resources
Leave a Reply