Nebius shares surged over 10% in pre-market trading to $164 following a sharp 12.65% drop the day before. This rebound came after the company released its 2025 Sustainability Report, showcasing major gains in energy and water efficiency at its data centers amid its global expansion of AI cloud services.
Energy Use Drops Well Below Industry Norm
The report revealed Nebius achieved a power usage effectiveness (PUE) of 1.25 on average across its data centers in 2025, significantly better than the global industry average of 1.54. This means more of the electricity consumed goes directly to computing rather than facility overhead like cooling. Through integrated design of servers, racks, cooling systems, and cloud infrastructure, Nebius avoided 102 gigawatt-hours of electricity use last year, equivalent to the annual consumption of nearly 9,800 US homes.
Despite plans to increase its computing capacity by several gigawatts, Nebius aims to keep operational waste low, enabling growth without a proportional rise in energy demand. This approach helps the company scale its AI cloud network sustainably as it balances expansion with energy efficiency.
Closed-Loop Cooling Slashes Water Consumption
Water efficiency also improved dramatically at a Nebius-owned site using closed-loop liquid cooling, which recorded water usage efficiency of just 0.018 liters per kilowatt-hour at the end of 2025. For comparison, US data centers typically use between 0.45 and 0.49 liters per kilowatt-hour. Nebius estimates that each gigawatt of new capacity could save roughly 3.3 billion liters of water annually, roughly 1,300 Olympic swimming pools worth.
also the company recovers waste heat at its Mäntsälä data center, further improving resource utilization. Nebius plans to expand these cooling and heat recovery technologies across future locations, reinforcing its commitment to sustainability while expanding computing power.
This article is for informational purposes and does not constitute financial advice.
