# OPG Secures 500 kV Grid Interconnection Approval for Darlington SMR Nuclear Station

> Ontario Power Generation (OPG) has secured regulatory interconnection approval to connect its 300 MW small modular reactor at Darlington directly into the provincial 500 kV bulk transmission system.

- **Source date:** 2026-10-01
- **Original source:** [Ontario Power Generation Media](https://www.opg.com/news/darlington-smr-500kv-grid-connection-approval-october-2026)
- **Reading time:** 1 min
- **Language:** en
- **URL:** https://voltformer.com/news/opg-secures-500kv-interconnection-darlington-smr-nuclear-october-2026
- **Markdown:** https://voltformer.com/news/opg-secures-500kv-interconnection-darlington-smr-nuclear-october-2026.md

## Small Modular Reactor Interconnection Design

The approved transmission interconnection incorporates a dedicated 500 kV switchyard bay equipped with SF6 gas-insulated circuit breaker arrangements.

A 350 MVA generator step-up transformer will elevate terminal voltage from 20 kV to 500 kV for feeding clean baseload power into the Greater Toronto grid.

## Baseload Reliability and Grid Stability

The 300 MW BWRX-300 unit will produce baseload electricity capable of powering 300000 homes continuously without carbon emissions.

High-reliability digital protection systems with fiber-optic differential relays guarantee transmission isolation within 35 ms in the event of an external network fault.

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