# Ontario Power Generation

Canonical page: https://technooptimist.io/companies/ontario-power-generation
Ontario's provincially owned utility, producing about half of the province's electricity. It runs the Darlington and Pickering nuclear stations and is building the G7's first small modular reactors at Darlington.

## In brief

- Wholly owned by the Government of Ontario; generates about half of Ontario's power.
- Building four GE Vernova Hitachi BWRX-300s at Darlington: C$20.9 billion, 1,200 MW, first unit on the grid by end-2030.
- Finished refurbishing Darlington's four CANDU units in early 2026, ahead of schedule and under budget.

## Facts

- Founded: 1999
- Headquarters: CA
- Status: government
- Website: https://www.opg.com
- Frontiers: [Energy](https://technooptimist.io/energy.md) (Small modular reactors)

## Programs

- [Darlington New Nuclear Project](https://technooptimist.io/energy/darlington-new-nuclear.md) (Energy): Pilot; next: First reactor building level complete (200+ modules) (Q4 2026). Unit 1 basemat set April 2026; grid target end-2030; go-ahead for units 2-4 expected 2028.

## Upcoming

- **2028**: Ontario decision on units 2-4 (Darlington New Nuclear Project)
- **Q4 2030**: Unit 1 grid connection (Darlington New Nuclear Project)

## Latest updates

- **23 Jun 2026**: Williams Treaties First Nations invest C$700 million in OPG's Darlington SMR project. Seven Williams Treaties First Nations, through a joint partnership, are investing C$700 million in the Darlington New Nuclear Project, the largest collective First Nations investment in Canadian nuclear power. ([our story](https://technooptimist.io/stories/williams-treaties-first-nations-invest-c-700-million-in-opg-s-d2d6ea59.md) · [original source](https://www.bnnbloomberg.ca/press-releases/2026/06/23/williams-treaties-first-nations-announce-historic-700-million-investment-in-darlington-new-nuclear-project/))
- **23 Oct 2025**: Canada Growth Fund and Building Ontario Fund commit C$3 billion for 22.5% of the Darlington SMR project. The federal Canada Growth Fund will put in up to C$2 billion for a 15% stake and Ontario's Building Ontario Fund up to C$1 billion for 7.5%, with OPG remaining majority owner and operator. ([our story](https://technooptimist.io/stories/canada-growth-fund-and-building-ontario-fund-commit-c-3-billion-for-22-33c45dd2.md) · [original source](https://www.renewcanada.net/feds-ontario-to-invest-3b-in-darlington-small-modular-reactor-project/))
- **8 May 2025**: Ontario approves construction of the first of four BWRX-300 small reactors at Darlington. Ontario's government cleared OPG to build the first of four 300 MW BWRX-300 reactors at Darlington, after the nuclear regulator issued a licence to construct in April. ([our story](https://technooptimist.io/stories/ontario-approves-construction-of-the-first-of-four-bwrx-300-small-d03a3cbc.md) · [original source](https://world-nuclear-news.org/articles/opg-gets-go-ahead-to-build-first-smr-in-canada))

## Partners, customers and investors

- GE Vernova Hitachi (supplier): Designs the BWRX-300 reactors for all four units.
- Aecon Kiewit Nuclear Partners (supplier): Construction contractor for the Darlington New Nuclear Project.
- AtkinsRéalis (supplier): Project and construction management.
- Canada Growth Fund (investor): Up to C$2 billion for a 15% stake (Oct 2025).
- Building Ontario Fund (investor): Up to C$1 billion for a 7.5% stake (Oct 2025).
- Williams Treaties First Nations (investor): C$700M loan that converts to equity once all four units are built (June 2026).

## People

- Nicolle Butcher, President and CEO
- Subo Sinnathamby, Chief Projects Officer

---

The Techno Optimist tracks every frontier of technology, program by program: https://technooptimist.io/ (a Markdown version of any page: add .md to its URL; site map for agents: https://technooptimist.io/llms.txt).
Data API (JSON, realtime stream): https://technooptimist.io/developers. People read 5 pages free, then Reader $10/month; these Markdown pages are open to agents.