( Coal ( continues ( to ( be ( ( ( the ( main ( energy source ) ) ) , ) ( ( primarily ( for electricity ) ) ( ( generation -LRB- ) 70 ) ) ) ) ) ) )
(ROOT (S (NP (NNP Coal)) (VP (VBZ continues) (S (VP (TO to) (VP (VB be) (NP (NP (DT the) (JJ main) (NN energy) (NN source)) (, ,) (VP (ADVP (ADVP (RB primarily)) (PP (IN for) (NP (NN electricity)))) (VBN generation) (-LRB- -LRB-) (NP (CD 70))))))))))
Coal continues to be the main energy source, primarily for electricity generation (70
(ROOT (S (NP (NNP Coal)) (VP (VBZ is) (NP (NP (DT the) (NN source)) (PP (IN of) (NP (JJS most) (NN electricity))))) (. .)))