Electricity and labor headwinds slow Amazon's data center buildout.The company's predicament highlights challenges faced by the broader cloud industry.Amazon is spending heavily on data centers to support booming AI workloads, putting it on pace to build 240 new facilities by 2040, according to one estimate.These plans are increasingly running into physical constraints that are slowing the buildout, according to an internal document, people familiar with the matter, and emails obtained through a...