Realta Fusion partners with Madison Gas and Electric to build 200 MWe fusion power plant in Wisconsin

A Wisconsin utility just put real money behind fusion energy, and the reason has less to do with scientific curiosity than with keeping the lights on for AI data centers. Realta Fusion, a Madison-based startup developing magnetic mirror fusion technology, announced a partnership with Madison Gas and Electric (MGE) to jointly develop a 200-megawatt electric fusion power plant in Wisconsin. The facility is designed to power roughly 150,000 homes and is targeting operation sometime in the 2030s. MGE isn’t just signing a future power purchase agreement. The utility made a direct equity investment in Realta, described as “meaningful,” and will provide engineering support, equipment, and assistance with permitting and financing. That makes this one of the earliest examples of a regulated utility embedding itself in a fusion company’s cap table during the technology’s development phase, not after it’s proven. Why utilities are suddenly interested in fusion Data centers consume enormous amounts of power, and their expansion shows no sign of slowing. For utilities like MGE, which serves approximately 170,000 customers in southern Wisconsin, the math is straightforward: future load growth re...