Reuters: * First Solar expected to win big U.S. utility contracts * Too soon to tell how subsidies will affect utilities * First Solar faces competition down the road from established players and start-ups Thin-film solar companies are poised to capture a big share of the U.S. power market as utilities seek renewable energy at the lowest possible cost, but doubts are being raised about whether that is enough to support First Solar Inc’s (FSLR.O: Quote, Profile, Research) …