Business: Natural Gas

Riverside Generating Station

Riverside Generating Station

Riverside Generating Station MapProject update: Atura Power submitted a proposal for the proposed RGS under the Independent Electricity System Operator’s (IESO’s) Long-Term 2 Request for Proposals (LT2 RFP) in December 2025. The IESO is expected to announce their LT2 contract awards in June 2026. An Environmental Review for this proposed project has been initiated as decisions for IESO contracts await.

Project overview

Riverside Generating Station General Partnership (the Proponent) is proposing to construct the Riverside Generating Station (RGS), a new natural gas-fuelled generating station in the Township of St. Clair, within the County of Lambton. The Proponent is a partnership between Atura Power, a subsidiary of Ontario Power Generation (OPG), and Caldwell First Nation.

The proposed Riverside Generating Station, a simple cycle gas turbine facility, will generate up to 500 megawatts (MW) of reliable electricity to Ontario’s grid and help meet the IESO’s identified need for additional electricity supply. The proposed project will also support the integration of additional renewable energy sources, longer term.

The site for the proposed RGS is located on the lands of the former OPG-owned and operated Lambton Generating Station along the St. Clair Parkway, between Courtright Line and Oil Springs Line. As a peaking facility, RGS will be designed to operate during periods of high demand using efficient gas turbine technology. The proposed station is anticipated to be operational by 2030 should it be awarded an IESO contract.

Learn more about gas-fuelled generation and the important role it plays in Ontario’s electricity system.

Responding to Ontario’s growing electricity demand

Ontario is entering an accelerated pace of electricity demand growth primarily driven by industrial growth, energy-intensive data centres and increasing population and electrification. According to the latest annual forecast from the Independent Electricity System Operator (IESO), electricity demand in Ontario is anticipated to grow 65 per cent by 2050.

To prepare for future electricity demands and support a reliable grid for Ontarians, the IESO has initiated a LT2 RFP to secure new electricity resources that could be in service into the 2030s and beyond.

Project Details

Project Name: Riverside Generating Station Project
Proponent: Riverside Generating Station General Partnership
Location: St. Clair Township, Ont.
Generating Technology: Natural Gas-Fuelled Electricity Generating Station
Maximum Capacity: Up to 500 MW

Environmental review process and project timeline

According to Ontario Regulation (O. Reg.) 50/24: Part II.3 Projects under the Environmental Assessment Act, the proposed RGS is subject to review under the Environmental Screening Process for Electricity Projects. The process has two tiers of assessment: Screening Stage and Environmental Review Stage. An Environmental Review has been voluntarily initiated, which includes a more comprehensive study of potential environmental effects. The Environmental Review process has been initiated prior to the LT2 contract awards announcement to meet IESO’s in-service deadlines, and to provide adequate time for meaningful public participation.

A Notice of Commencement of an Environmental Review was issued on February 12, 2026, to advise of the start of the Environmental Review. An Environmental Review Report (ERR) will be made available for a 30-day public review period following completion of the Environmental Review later this year. The ERR will include a review of existing conditions, potential environmental effects and proposed mitigation measures, and document engagement activities and input from Indigenous communities, the host municipality of St. Clair Township, the public and other interested parties.

All necessary permits and approvals would be secured prior to any potential construction activity.

Preliminary timeline for proposed project

Riverside generating station timeline

We want to hear from you

We are committed to engaging with the public and Indigenous communities throughout the Environmental Review process and beyond.

Please view the Resources and materials section of this webpage to access project documents and public meeting materials.

Please access the Contact us form if you have any questions.

Frequently Asked Questions

In November 2024, the Lambton site was one of three strategic Ontario Power Generation (OPG) owned sites, along with Wesleyville and Nanticoke, identified by the Ontario Government for potential future electricity growth.

OPG is in the early stages of evaluating potential opportunities for redeveloping the Lambton site for electricity generating purposes.

Atura Power is a subsidiary of OPG and its proposed Riverside Generating Station project – an up to 500 MW natural gas-fueled electricity generating station – is being explored as part of a separate, competitive process managed by the Independent Electricity System Operator (IESO). The proposed project is a coordinated effort with OPG to maximize the generation potential of the site with the possibility of co-locating other technologies in the future. 

The proposed Riverside Generating Station project provides economic and strategic value to Ontario by reinforcing local energy security and utilizing existing grid infrastructure at a site with a proven track record of supporting provincial electricity needs.

There are several advantages to the Lambton site, including:

  • Site is already zoned for industrial use;
  • Access to high voltage transmission;
  • Access to reliable natural gas;
  • Access to railway and deepwater dock;
  • Potential to co-locate other technologies on-site, longer-term;
  • Reduced environmental impacts due to brownfield site condition; and
  • Strong local workforce and capabilities.

The proposed Riverside Generating Station (GS) would not preclude the exploration of other electricity generating technologies on the Lambton site in future years including energy storage, solar, hydrogen and/or nuclear.

The proposed Riverside GS project would occupy a small portion of the Lambton site property and represents the first of several technology options that could be explored longer term.

Gas facilities are strategic transitional assets, bridging the gap as demand is increasing dramatically (up 65 per cent by 2050 according to the IESO) until storage, renewables and other non-emitting generating sources can meet peak demand.

The proposed Riverside Generating Station (GS) would source natural gas from a diverse and secure North American supply network, including both U.S. and Canadian production from Alberta and British Columbia. Natural gas is expected to be drawn from the Dawn Hub - one of North America’s largest integrated storage and trading facilities - located in southwestern Ontario, near the City of Sarnia.

By leveraging this strategic infrastructure, Riverside GS will ensure a reliable and flexible fuel supply to support Ontario’s electricity system. As a peaking facility, it is designed to operate during periods of high demand or system stress, enhancing grid reliability while consuming gas only intermittently.

Atura Power is focused on Ontario-first spending and supporting local economies in its host communities. This includes a commitment to working with local suppliers and contractors wherever possible, ensuring that the economic benefits of this project stay within the host community, should the project advance.

Project Documents

Project documents will be posted as they become available. Please let us know if you require an alternate format for any documents posted through the Contact Us form below.

Environmental review materials

Initial Project Description

LT2 public meeting materials

Contact us

Comments and information regarding this project are being collected in accordance with the Freedom of Information and Protection of Privacy Act. With the exception of personal information, all comments received will become part of the project record.

Napanee Generating Station expansion

Napanee Generating Station Expansion

Project overview

Napanee Generating Station Public Notice Map

Atura Power, a subsidiary of Ontario Power Generation, is expanding the electricity generation capacity of its Napanee Generating Station (NGS). The Napanee Generating Station Expansion is located north of the Lake Ontario shoreline in the Town of Greater Napanee, Ont., between the existing NGS and Lennox Generating Station. The expansion will add a simple-cycle gas turbine generator unit that will provide up to 405 megawatts (MW) of electricity to Ontario's electricity grid.

Project update: An Environmental Review Report (ERR) was prepared to document the assessment of potential environmental effects of the project. The review determined the project will not cause significant environmental effects. Following the environmental review process, Atura Power submitted the Statement of Completion to the Ministry of the Environment, Conservation and Parks (MECP) on October 9, 2025. Atura Power intends to proceed with the project subject to mitigation and impact management measures and receipt of other approvals. Indigenous and stakeholder engagement activities remain a priority and will continue throughout the project.

Building capacity for Ontario's electricity grid

The Napanee Generating Station Expansion will increase Ontario's electricity generation, support grid reliability, and help advance Ontario's path to a low-carbon energy future.

After more than a decade of strong supply, Ontario is entering a period of emerging electricity system needs, driven by increasing demand, the refurbishment of existing generating assets, as well as expiring contracts for other electricity-producing facilities.

To prepare for future electricity demand and support a reliable grid for Ontarians, the Independent Electricity System Operator (IESO) initiated the LT1 RFP procurement process to secure new electricity resources to be in service by 2028. An application for the Napanee Generating Station Expansion was submitted to the IESO in December 2023 and awarded an LT1 contract on May 9, 2024. The LT1 procurement process is now complete.

Environmental review process and project timeline

On April 8, 2024, Atura Power initiated an Environmental Review Process for the Napanee Generating Station Expansion. Pursuant to Ontario Regulation 50/24 under the Environmental Assessment Act, Atura Power elected to undergo a “Category B” Environmental Review as described in the MECP “Guide to Environmental Assessment Requirements for Electricity Projects” (February 2024). Atura Power held a public meeting on May 16, 2024, to share information and gather feedback about the proposed project. Meeting materials are posted in the Project resources and materials section below.

Atura Power issued a Notice of Completion of the environmental review on April 17, 2025.

An ERR documented this assessment and is available in the Project resources and materials section below.

2025-10-14_Napanee Webpage Timeline V3_Atura_page-0001

We want to hear from you

Atura Power is committed to engaging Indigenous communities, municipalities, agencies, the public and all interested stakeholders throughout this project.

Contact us

Comments and information about this project are collected according to the Freedom of Information and Protection of Privacy Act to meet environmental assessment requirements. All comments received become part of the project record except for personal information.