California-based startup Span, in partnership with Nvidia, is deploying miniaturized compute nodes called XFRA in homes and small businesses in Northern California. These cabinet-sized units installed on building facades, equipped with liquid-cooled Nvidia RTX PRO 6000 Blackwell Server Edition GPUs, could generate between 1 and 2 megawatts of compute capacity this year, reaching over 1 gigawatt annually starting next year, according to company estimates. Homebuilder PulteGroup is currently testing the system, which operates for a monthly fee of approximately 150 dollars, with Span covering owners’ electricity and internet bills. UK-based startup Heata, which has installed its servers in about 100 homes, claims to have generated 8 million liters of hot water and saved households approximately 55,000 dollars on energy bills. According to a preliminary analysis by Professor Robert Davies of Utah State University, only 30 to 40 percent of homes may be suitable for these technologies due to integration constraints, and only 2 to 3 percent could realistically be heated through server waste heat recovery.
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