The agriculture land needed to grow the willow is 1500000 Hectares
What is Power?
Power can be defined as the rate at which work is done by an object. The S.I unit of power is Watt(W).
A coal burning power station burns 6 million tonnes of coal per kg. Coal has a average energy value of 29.25 MJ per year. Wood chip from willow trees has an energy value of 13 MJ per kg. A hectare of agricultural land can produce 9 tonnes of drt willow wood per year.
The coal consumption per year = 29.25 x 1000 x 6000000
=175500000000 MJ
If this power station burned dry willow wood instead of coal, agriculture land would be needed to grow the willow,
1 hectare of willow will produce 9 x 13x 1000 = 117000 MJ.
The agriculture land needed to grow the willow is
= 175500000000 MJ / 117000 MJ.
= 1500000 Hectares.
Thus, agriculture land needed is 1500000 Hectares.
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