- 670,000 metric tons (tonnes) of gravel for access roads
- 9,648,000 (almost 10 million) tonnes of concrete for foundations
Calculations:According to one wind company’s project description:
- a half-mile of access road requires about 100 tonnes of aggregate (gravel)
- the volume of a turbine foundation is 600 cubic metres of concrete
The density of normal concrete is 2400 kg/m3. Therefore, the mass of a 600 m3 wind turbine foundation is 1,440,000 kg or 1440 metric tons (tonnes). Based on the current estimate of 6,700 wind turbines for Ontario, this translates to 9,648,000 (almost 10 Million tonnes or 10 Billion kg) of concrete for foundations.
A spreadsheet breaking down the estimated 6,700 turbines can be found on the home page.