Feb 24 (Reuters) - Alphabet's Google doubled down on efforts to secure power supply for its data centers across the country by entering into ‌separate agreements with U.S. utilities, AES Corp and Xcel Energy, on Tuesday. Big ‌Tech firms have been scouring for new, reliable and cleaner energy sources to power their rapidly expanding ​data centers, which have been driven by increasing use of artificial-intelligence applications. To meet the surging demand, utilities have been investing heavily to upgrade ...