U.S. utility NiSource said on Thursday it had signed a long-term energy supply agreement with a unit ‌of Alphabet to support a large data center in northern ‌Indiana. The company also said it had expanded an agreement with Amazon to speed up ​power delivery to its sites and bring forward bill credits for households. • Big Tech firms have been scouring for new, reliable and cleaner energy sources to power their rapidly expanding data centers, which are being driven ‌by the increasing use of ⁠artificial-intelligence applications.