At a public hearing held by the Wisconsin Public Service Commission dozens of Wisconsin residents discussed the negative impacts they believed the massive data centers could have on the state’s electricity rates and ability to adopt renewable energy sources. 

The three-member PSC is considering a proposal from the Wisconsin Electric Power Company to establish a tariff system for providing electricity to massive data centers. Under the proposal, “very large” customers that would be subject to the tariff would have a combined energy load of 500 megawatts — the equivalent of powering about 400,000 homes. 

The first phase of Microsoft’s $13.3 billion data center project in Mount Pleasant is projected to require 450 megawatts. Utilities have disputed the negative charges made and generally support the building of the data centers as beneficial for the state’s economy and utility ratepayers.