Virginia Gov. Abigail Spanberger's data center plan is facing criticism that one of its key provisions may work against itself: Limits on on-site natural gas generation could make it harder, not easier, for large data centers to support Virginia's already-stressed electric grid.The stakes are high because Virginia is already struggling to keep up with rapidly growing data-center electricity demand, especially in Northern Virginia, where demand is outpacing the expansion of transmission lines and

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