President Trump and tech CEOs expressed confidence Wednesday that they can contain soaring electricity rates with a new data center pledge that formalizes and expands on what companies already are doing.Why it matters: With rising power bills turning AI and data centers into an election-year issue, Trump — who campaigned on a promise to cut costs — is eager to show he's trying to protect consumers.Skeptical Democrats and some energy observers, however, say that far more than voluntary pledges ar...