( ( These sources ) ( ( included ( ( ( ( fossil fuels ) ( -LRB- ( coal -RRB- ) ) ) , ) ( ( biomass , ) ( nuclear ( , ( hydro ( , ( geothermal ( , ( ( solar and ) wind ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These) (NNS sources)) (VP (VBD included) (NP (NP (NP (JJ fossil) (NNS fuels)) (PRN (-LRB- -LRB-) (NP (NN coal)) (-RRB- -RRB-))) (, ,) (NP (NP (NNS biomass)) (, ,) (NP (JJ nuclear) (, ,) (NN hydro) (, ,) (NN geothermal) (, ,) (NN solar) (CC and) (NN wind))))) (. .)))
These sources included fossil fuels (coal), biomass, nuclear, hydro, geothermal, solar and wind.
(ROOT (S (NP (NP (NNP Solar)) (CC and) (NP (NN wind))) (VP (VBP are) (ADVP (RB still)) (ADJP (JJ expensive)) (PP (VBN compared) (PP (TO to) (NP (JJ fossil) (NNS fuels))))) (. .)))