IESO / Hydro One (Ontario)
Eastern Interconnection
Overview
The Independent Electricity System Operator (IESO) and Hydro One — the Ontario market operator and transmission utility, buyers of 500/230 kV power transformers.
Grid characteristics
- Operating region: Canada — North America
- System frequency: 60 Hz
- Synchronous area: Eastern / Western / Québec
- Top voltage class: 500 kV
Transformer & substation profile
- Highest voltage class in this market: 500 kV
- Transformer demand driver: Eastern Interconnection
- Procurement notes: Utilities in this market procure against national grid codes and international standards — verify the governing standard before a tender.
Relevant manufacturers
9 transformer makers recorded in the Canada census — power, distribution and dry-type. Verify capability before a decision.
Hitachi Energy Canada Delta Star Canada PTI Transformers Northern Transformer Hammond Power Solutions CES Transformers Cam Tran (Central Moloney) Rex Power Magnetics Carte International
Market context
Latest TransformerPath intel
- No recent TransformerPath intel for this market yet.
Related projects
- No transformer-relevant project records yet for this market — see the projects list.
Upcoming events
- IEEE PES General Meeting 2026 2026-07-19 · Montréal, Canada
- CIGRE Canada Conference & Exhibition 2026 (Calgary) 2026-09-21 · Calgary, Canada
- IEEE ECCE 2026 (Vancouver) 2026-10-04 · Vancouver, Canada
Last reviewed: 2026-08-28. Sources: official utility / operator filings and public announcements; maintained encyclopedia-style from the TransformerPath grid census. Report a correction.
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