Rising Summer Heat and Power Strain Push Data Centers Toward More Outages

By August 2025, rising summer temperatures are pushing data centers and their host communities to a breaking point. More than half of the world's data center capacity is at risk from heatwaves, drought and water stress, according to a new analysis. In Henrico County, Virginia, which hosts 37 data centers, the county manager sent an email on June 26 asking thousands of employees and schools to conserve electricity after a 25 percent rate hike is set to take effect July 1.

The rate increase will cost Henrico County an estimated $5 million in the next fiscal year, and the email warned of more increases ahead. The 25 percent jump applies to all government and school facilities, not just data centers, but the facilities are a major driver of local power demand.

How Heat Clobbers Cooling Systems

Data centers rely on mechanical cooling to keep servers within safe operating temperatures. When outdoor air temperatures climb above design limits, chillers and computer room air handlers lose efficiency. Some facilities are forced to throttle compute loads or shut down entirely to avoid hardware damage. The analysis notes that more frequent and intense heatwaves compound the problem, especially in regions like Northern Virginia where hyperscale campuses concentrate.

• Over half of global data center capacity is in zones facing elevated heat and water risk.
• Heatwaves can reduce cooling system efficiency by 20 to 30 percent.
• Drought conditions limit the availability of water for evaporative cooling towers.
• Power grids already strained by air conditioning demand face additional spikes from data centers.
• Uptime Institute data shows that temperature-related outages are a growing share of total downtime events.

Grid and Community Friction Intensifies

The Henrico County case illustrates a broader tension: data center growth drives demand for electricity and cooling water, but the infrastructure upgrades needed to supply them are often costly and slow. The county has not asked data centers to throttle operations, but the conservation request puts schools and government offices on notice that power is no longer plentiful or cheap. Local officials in other data center hubs, including Loudoun County and parts of Ireland and Singapore, have imposed moratoriums or stricter permitting requirements in response to similar strain.

What comes next depends on technology and policy. Liquid cooling, including direct-to-chip and immersion, can reduce reliance on air conditioning and water. On the grid side, utilities are adding battery storage and demand response programs to shave peak loads. But those solutions take years to deploy at scale. In the near term, operators and regulators face a summer of tough choices between compute availability and community electricity budgets.