Norbert W. answered • 07/20/16

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4.4
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Since x is the increase in MW, the total number of MW would be (x + 2).

Also, the MW from windmill is 20% of total usage => x/(x + 2) = .2

Solving for x: x = .2(x + 2) = .2x + .4

.8x = .4

x = 0.5 MW