For the past five years, tech companies have been on an increasingly frenzied shopping spree for renewable contracts known as power purchase agreements (PPAs), which can enable data center operators to reserve power from a wind farm or solar site before the projects have even been built. In Denmark, there are solar farms paid for by Meta. In Norway, there are wind farms bankrolled by Google. As early adopters of these types of deals, tech companies have helped fuel Europe’s now-thriving PPA market, says Christoph Zipf, spokesperson at WindEurope. This month, Microsoft struck the world’s biggest renewables energy deal, signing a $10 billion contract for clean power across Europe and the US.

Yet renewables still need to run through the electricity grid, which is becoming a bottleneck—especially in Europe, as a surge of renewable producers try to connect to feed green transition demand across a multitude of sectors. “We’re going to run into energy constraints,” Meta CEO Mark Zuckerberg predicted on a podcast in April. At Davos this year, OpenAI CEO Sam Altman also warned that the status quo was not going to be able to provide AI with the power it needed to advance. “There’s no way to get there without a breakthrough,” he said at a Bloomberg event.