Data centers are powered by a mix of fossil fuels, renewables, and nuclear energy, with renewables growing fastest but fossil fuels still dominating in many regions.

Global Energy Consumption

Data centers currently consume about 1.5% of global electricity, equivalent to roughly 415 TWh in 2024, and this is projected to more than double to 945 TWh by 2030 due to AI and cloud computing growth . Globally, the electricity mix for data centers is dominated by coal (30%), natural gas (26%), and nuclear (15%), while renewables—primarily wind, solar PV, and hydro—supply about 27% of current demand . The share of renewables is the fastest-growing segment, projected to meet nearly 50% of the growth in electricity demand for data centers between 2024 and 2030 .

Regional Differences

• United States: Natural gas is the largest source at over 40%, followed by renewables (24%), nuclear (20%), and coal (15%). Renewables and small modular reactors (SMRs) are expected to reduce reliance on fossil fuels after 2030 .
• China: Coal remains the dominant source, contributing the highest share globally, though renewables are increasing .
• European Union: Data centers consumed about 70 TWh in 2024, projected to rise to 115 TWh by 2030. The EU emphasizes energy efficiency and renewable integration, guided by initiatives like the EU Code of Conduct for Data Centres .

Onsite Generation and Backup

By 2030, approximately 30% of data centers are expected to use onsite power as a primary or supplemental source, including fuel cells, solar, and battery storage . Backup energy storage is common to ensure high uptime, allowing data centers to respond flexibly to grid conditions .

Trends and Strategic Implications

• Renewable PPAs and co-located generation: Many operators invest directly in wind and solar to secure low-emission electricity .
• Nuclear adoption: SMRs are expected to play a growing role in the U.S., reducing fossil fuel dependence .
• Grid challenges: Rapid growth in data center demand, especially in AI-heavy regions like Northern Virginia, strains local grids and increases lead times for new power connections .
• Energy efficiency: EU and global initiatives aim to double energy efficiency improvements and expand renewable capacity to meet rising demand sustainably .

Summary

Data centers rely on a diverse energy mix, with fossil fuels still significant but renewables and nuclear increasingly important. Regional differences are pronounced, with the U.S. and China leading in consumption. The fastest growth is in renewable energy, supported by corporate investments and policy incentives, while onsite generation and storage enhance reliability. As AI and cloud computing expand, energy planning, efficiency measures, and low-emission sourcing will be critical to sustainable data center operations.