Utility deals rarely make investors lean forward. This one should. Xcel Energy (NASDAQ:XEL | XEL Price Prediction) just struck an electric service agreement with Google that rewrites who pays for the AI buildout, and it could become the template every hyperscaler and regulated utility copies for the next decade. The headline: residential and small-business customers ... Google Data Center Deal Will Save Xcel Energy Customers Up To $1.5 Billion O…