{
  "language": "en",
  "interfaceLanguage": "ar",
  "url": "https://voltformer.com/ar/news/hydro-quebec-orders-735kv-autotransformers-hertel-chamouchouane-substations",
  "slug": "hydro-quebec-orders-735kv-autotransformers-hertel-chamouchouane-substations",
  "category": "transformers-grid",
  "publishDate": "2026-09-24",
  "sourceName": "Hydro-Québec TransÉnergie Engineering Division",
  "sourceUrl": "https://www.hydroquebec.com/press/transenergie/735kv-autotransformers-chamouchouane-hertel-september-2026.html",
  "readingTimeMinutes": 5,
  "tags": [
    "Hydro-Québec",
    "735 kV",
    "Autotransformers",
    "Substations",
    "Canada",
    "CHPE",
    "Hydropower"
  ],
  "content": {
    "title": "Hydro-Québec Awards Major Contract for 735 kV Single-Phase Autotransformers for Hertel and Chamouchouane Substations",
    "summary": "To secure the bulk transmission corridor linking James Bay hydropower with southern load centers and the Champlain Hudson Power Express interconnector, Hydro-Québec has ordered nine 370 MVA 735/315 kV single-phase autotransformer units with enhanced cold-climate insulation.",
    "sections": [
      {
        "heading": "Reinforcing the 735 kV Extra-High-Voltage Backbone",
        "paragraphs": [
          "Hydro-Québec TransÉnergie operates the world’s pioneer commercial 735 kV transmission system, traversing subarctic terrain subject to ambient temperatures below -45 °C and heavy freezing rain icing. The new 370 MVA single-phase units will form three redundant 1,110 MVA three-phase autotransformer banks at Hertel and Chamouchouane substations.",
          "The transformers feature specially engineered low-viscosity naphthenic mineral oil, high-grade silicon steel cores, and automated nitrogen-injection fire protection systems (NIFPS) to ensure uncompromised dielectric resilience against severe geomagnetic induced currents (GIC)."
        ]
      },
      {
        "heading": "Enabling Clean Power Exports to New York and New England",
        "paragraphs": [
          "The substation upgrades are vital for operating the 1,250 MW Champlain Hudson Power Express (CHPE) HVDC transmission line at continuous full load while maintaining provincial N-1-1 reserve margins.",
          "Factory acceptance testing at 735 kV full lightning impulse (BIL 2,050 kV) will be completed by mid-2027, with site energization slated for early 2028 under Hydro-Québec’s 2035 Grid Master Plan."
        ]
      }
    ]
  },
  "companies": []
}