Memphis utility flags risks of xAI power grid expansion
Memphis utility MLGW warned that xAI's announced expansion of its Colossus supercomputer facility from 100,000 to 1 million GPUs could exceed local power infrastructure capacity. MLGW is conducting a mandatory study to assess whether the expansion would disrupt service to existing customers.
What happened
xAI announced plans to expand its Memphis Colossus supercomputer facility from 100,000 GPUs to 1 million GPUs, a 900% increase. Memphis Light, Gas and Water (MLGW) CEO Doug McGowen warned the utility may not have sufficient power infrastructure to support such an expansion without building new infrastructure.
MLGW is currently studying the impacts of xAI's expansion on its power system. The utility indicated that xAI's initial facility is using 50 megawatts of power, with plans to reach 150 megawatts, and a second request for an additional 150 megawatts is still under review.
Reported impact
McGowen stated that limits exist to the number of electrons that can be transmitted along power lines without threatening local or even national service. The expansion could disrupt reliable power delivery to existing MLGW customers if infrastructure constraints are not addressed.
Index analysis
MLGW is required by federal law to review each request for service to prevent disruptions to service. McGowen emphasized that whether the expansion is possible is 'a physics problem, not a political problem, about how much energy can be provided.'
Governance controls
MLGW stated it will not allow a customer to expand operations or add generation assets until the utility has studied the impacts and confirmed there will be no effect on existing customers. The utility must follow a federal process for any request to increase capacity or add new generation.
Classification
Sources and evidence
This record was researched and written by the Index, based on the following original reporting.