(Reuters) - U.S. electric utilities predict a tidal wave of new demand from data centers powering technology like generative AI, with some power companies projecting electricity sales growth several times higher than estimates just months earlier. Nine of the top 10 U.S. electric utilities said data centers were a main source of customer growth, leading many to revise up capital expenditure plans and demand forecasts, according to a Reuters analysis of company earnings reports from the first three months of the year.