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 Interconnection
- 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
13 transformer makers recorded in the Canada census — power, distribution and dry-type. Verify capability before a decision.
Bemag Transformer Cam Tran (Central Moloney) Carte International CES Transformers Delta Star Canada Hammond Power Solutions Hitachi Energy Canada Moloney Electric Canada Northern Transformer PTI Transformers Rex Power Magnetics Pioneer Transformers Partner Technologies
Market context
Latest intelligence about this operator
- No published intelligence evidenced as about this operator.
Related projects
- Site C Clean Energy Project (500 kV transmission interconnection) energized · CONFIRMED
- Chamouchouane–Bout-de-l'Île 735 kV Transmission Project energized · CONFIRMED
- Romaine River Hydroelectric Complex energized · CONFIRMED
- Maritime Link HVDC (Nova Scotia–Newfoundland) energized · INFERRED
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
Census verified 7 July 2026. Record updated 11 July 2026. Sources: official utility / operator filings and public announcements; maintained encyclopedia-style from the TransformerPath grid census. Report a correction.
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