The energy generated from the fuel is used to boil the water

I think in this blank,we should fill in the word "steam".cuz the water will be heated and turned into steam to drive the turbine.and thanks for "关公耍大刀",he did a nice job to translate it into chinese which is better for u to understand.:-)

很高兴为您
boiling
能量从燃料中生产出来，能量被用于烧开水，开水用来转动涡轮。
说的很明白吧
希望我的回答对您有帮助，祝您学习进步，工作顺心。^_^