Big Tech's coming vow to pay for its own power amid the data center boom may be light on policy specifics. But it could still pack a political punch.Why it matters: Electricity markets are largely regulated at the state and regional levels, limiting Washington's direct sway.Even so, the White House-tech initiative "is a big bully pulpit that could influence state economic regulators around the country even if it lacks an implementation plan or regulatory teeth," said Rob Gramlich, founder of Gri...