Microsoft ‘preserving its ability’ to challenge data center transmission costs decision

In Virginia, regulators recently ordered Dominion Energy to make large data centers pay directly for certain transmission costs, rather than spreading those costs across all customers. This came after the Virginia State Corporation Commission ruled in July that Dominion must require a mandatory upfront payment (called a "contribution in aid of construction") from data centers for the substations and transmission lines built specifically to connect those facilities to the grid. Dominion has until October to file its detailed plan for how this will work.

Microsoft has now filed a notice with the Virginia Supreme Court that keeps its option open to formally appeal this decision, though a company spokesperson says Microsoft has not filed an appeal yet. The company says it wants to make sure any final rates are "transparent, fair" and reflect what each customer actually costs the system. Microsoft has until late November to decide whether to move forward with a full appeal. Other tech companies involved in the case, including Google, have taken a different stance — Google has said it's comfortable with mandatory payments for direct connection costs, as long as those costs are clearly separated from broader grid upgrade costs.

For homeowners, this dispute matters because it's part of a larger fight over who pays for the electric grid upgrades that massive data centers require. If regulators succeed in requiring tech companies to cover more of these specific costs themselves, it could reduce the amount that gets passed along to residential ratepayers on their electric bills.