Hydro One and IESO Break Ground on 500 kV Clean Energy Transmission Corridor in Ontario
Hydro One and Ontario's Independent Electricity System Operator (IESO) have begun construction on a 120 km 500 kV transmission line and switching facility to supply 2000 MW of industrial capacity.
- Publish date: 2026-10-03
- Category: HVDC & Substations
- Original source: Hydro One Media Relations
- Reading time: 1 min
Southwestern Ontario Grid Expansion
The new 500 kV double-circuit corridor connects Chatham switching station to the Lambton transmission hub across 120 km of upgraded rights-of-way.
Steel lattice towers with bundled 4-conductor arrangements are engineered to deliver 2000 MW of continuous transmission capacity.
Reactive Power and Substation Automation
2 shunt reactors rated at 500 kV and rated at 150 Mvar each are being installed at terminal substations to provide voltage control and dynamic reactive power balancing.
Full digital substation architecture utilizing IEC 61850 protocol reduces copper cabling by 70 % and enables automated remote switching.