Wind Turbine size classifications in Ontario, Canada

Ontario’s Ministry of Environment defines wind turbines (WTs) like this:

  1. Class 1: wind facilities with a name-plate capacity of less than or equal to 3kW
  2. Class 2: between 3 kW and 50 kW
  3. Class 3: name-plate capacity of  50 kW or greater with a sound power level less than 102 dBA
  4. Classes 4 & 5: greater than 50 kW with a sound power level greater than or equal to 102 dBA
  • Note that these classifications only consider dBA, not other types of noise.
  • Name-plate capacity is the theoretical maximium output of a turbine.
  • Turbines typically operate at about a quarter of their name-plate capacity.
  • actual generation from wind is less than 10% of capacity during the summer months.
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