The word hydroelectric is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 25
Highest Scoring Words With Friends™ Play In The Letters hydroelectric
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Seven Letter Word Alert: (53 words)
cheerio, cheerly, chicory, choicer, choleic, chortle, chytrid, circled, circler, circlet, cliched, clothed, coerced, coercer, cohered, coherer, correct, coterie, crochet, cycloid, decoyer, decrier, dicotyl, dicycle, diether, diethyl, ditcher, elector, erectly, erector, etheric, heretic, icecold, lechery, orderly, recited, reciter, rectory, recycle, rehired, reoiled, retched, retiled, retired, retried, thirdly, thyroid, tireder, tiredly, torched, trochee, yielder, yodeler