( ( ( ( ( Coal ( ( is still ) ( ( the ( ( most plentiful ) source ) ) ( of ( ( affordable energy ) ( in ( this country ) ) ) ) ) ) ) , ) and ) ( it ( is ( by ( ( far ( the ( primary source ) ) ) ( of ( electric ( power generation ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Coal)) (VP (VBZ is) (ADVP (RB still)) (NP (NP (DT the) (ADJP (RBS most) (JJ plentiful)) (NN source)) (PP (IN of) (NP (NP (JJ affordable) (NN energy)) (PP (IN in) (NP (DT this) (NN country)))))))) (, ,) (CC and) (S (NP (PRP it)) (VP (VBZ is) (PP (IN by) (NP (NP (RB far) (DT the) (JJ primary) (NN source)) (PP (IN of) (NP (JJ electric) (NN power) (NN generation))))))) (. .)))
Coal is still the most plentiful source of affordable energy in this country, and it is by far the primary source of 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))))) (. .)))