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That is nearly double current datacentre demand.
About 80% of the new power demand comes from US projects. Uptime is not optimistic about these power needs being met.
"Surging datacentre power demands, particularly in North America, cannot be supported by power grids already operating under heavy strain," Uptime said in a January report.
In California, datacentres stand empty for years because the local grid cannot supply them with power.
In Amsterdam, an Australian developer sued the Dutch grid after its connection request was denied.
Some observers are more upbeat.
JLL expects around 1,200 datacentres to be built globally between now and 2030, driven overwhelmingly by AI.
Andrew Batson, global head of datacentre research for JLL, said he is confident the capacity will be built, citing improvements in battery storage and onsite power generation.
"I am confident that the industry will work through the energy challenges," Batson said.
According to an Uptime report, the seven largest planned datacentres propose a combined 45GW of onsite power, primarily from gas.
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The UK’s peak energy demand is 45GW.