It was originally thought the spill involved about 3, 000 litres of a chemical liquid, but the fire service said it was 775 litres of non-hazardous petroleum distillates.
While windmills cannot power cars directly, motor gasoline accounts for less than half of the consumption of petroleum products in America, so if wind reduces only non-vehicular use of petroleum it will still reduce reliance on petroleum products from the Middle East.
Further upside risks have stemmed from high international crude prices, their impact on freely priced petroleum products, the increase in administered coal prices and pick-up in non-food manufactured product prices.