( Coal ( ( is ( ( the ( major ( fuel source ) ) ) ( used ( for ( electric ( power generation ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Coal)) (VP (VBZ is) (NP (NP (DT the) (JJ major) (NN fuel) (NN source)) (VP (VBN used) (PP (IN for) (NP (JJ electric) (NN power) (NN generation)))))) (. .)))
Coal is the major fuel source used for electric power generation.
(ROOT (S (NP (NNP Coal)) (VP (VBZ is) (NP (NP (DT the) (NN source)) (PP (IN of) (NP (JJS most) (NN electricity))))) (. .)))