( ( The ( energy charge ) ) ( ( varies ( according ( to ( ( the ( voltage ( level ( and ( time periods ) ) ) ) ) ( of consumption ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN energy) (NN charge)) (VP (VBZ varies) (PP (VBG according) (PP (TO to) (NP (NP (DT the) (JJ voltage) (NN level) (CC and) (NN time) (NNS periods)) (PP (IN of) (NP (NN consumption))))))) (. .)))
The energy charge varies according to the voltage level and time periods of consumption.
(ROOT (S (NP (NNP Voltage)) (VP (VP (VBZ is) (RB not) (NP (NP (DT the) (JJ same)) (PP (IN as) (NP (NN energy))))) (, ,) (CC but) (VP (VBZ means) (NP (NP (DT the) (NN energy)) (PP (IN per) (NP (NN unit) (NN charge)))))) (. .)))