It is a hardy wind pollinated plant that is 0.1 m (4 in) by 0.5 m (20 in).

Clean energy sources include wind, hydroelectric plants and methane gas collected from landfills.

However, in a merchant power arrangement, the wind plant is built without (or with little) prior commitment of its output to contractual off-takers.

Groups of large turbines, called wind farms or wind plants, are the most cost-efficient use of wind-energy capacity.

The world's largest wind plant is the Raheenleagh Wind Farm located off the coast of Ireland.

That would seem to justify federal policies subsidizing wind, because broad sections of the economy would benefit, although developers of wind plants would suffer.

Another idea is to spread wind plants geographically, so that if wind is low in one area, it may still be sufficient in another.

Producing a terawatt-hour needs £6.4M of capital spend for the nuclear option - and £51.4M for the wind plant.

Villagers said that work on the wind plant resumed the day after the protest and was racing toward completion.

This reserve capacity can also serve to compensate for the varying power generation produced by wind plants.