(S (S (NP (BASENP (NNP Xcel) (NNP Energy)) (PRN (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ supplies) (NP (BASENP (QP (RB approximately) (NN half))) (PP (IN of) (NP (BASENP (DT the) (NN electricity)) (PP (IN in) (BASENP (DT the) (NN state))))))))) (COMMA ,))) (VP (VBZ is) (VP (VBN required) (S (VP (TO to) (VP (VP (VB provide) (NP (BASENP (NN 30) (NN percent)) (PP (IN from) (BASENP (JJ renewable) (NNS sources))))) (PP (IN by) (BASENP (NN 2020))))))))) (PERIOD .))