How much power does a data center use?
Depending on the size and purpose of the facility, the answer can range from a few megawatts to hundreds of megawatts for a major hyperscale or AI data center campus.
That enormous range is why statements such as “this data center requires 100 MW” need context.
A megawatt measures power at a point in time. Electricity consumed over a longer period is typically measured in megawatt-hours, gigawatt-hours or terawatt-hours.
Understanding the difference makes it much easier to interpret data center announcements and utility filings.
How Much Power Does a Data Center Use in MW?
There is no universal classification that assigns a specific electrical load to every type of data center.
However, these illustrative ranges help put the numbers in perspective:
| Data Center Scale | Illustrative Power Range |
|---|---|
| Small facility | 1–5 MW |
| Medium facility | 5–20 MW |
| Large facility | 20–100 MW |
| Hyperscale facility or campus phase | 100–300+ MW |
| Very large multi-building campus | 300 MW–1 GW+ |
These are illustrative ranges rather than official industry definitions.
Actual projects vary significantly.
A campus can also receive approval or utility capacity for substantially more power than it initially uses because facilities are often built in phases.
For more background, read why data centers use so much electricity.
What Does a 100 MW Data Center Mean?
A 100 MW load equals:
100,000 kilowatts of power.
If a data center actually consumed exactly 100 MW continuously for an entire year:
100 MW × 8,760 hours = 876,000 MWh
That equals:
876 million kWh per year.
Actual consumption could be lower.
The facility might not operate at its maximum designed or contracted electrical load every hour.
That is why maximum power capacity and annual energy consumption should not be treated as the same measurement.
MW vs. MWh
This distinction is fundamental to understanding data center power consumption.
Megawatt — MW
A megawatt measures power.
It describes the rate at which energy is being used at a given moment.
Megawatt-Hour — MWh
A megawatt-hour measures energy consumed over time.
A facility drawing 1 MW continuously for one hour consumes 1 MWh.
Therefore, when a developer describes a proposed facility as a “500 MW campus,” that typically describes electrical capacity or demand—not annual electricity consumption.
How Much Electricity Do U.S. Data Centers Use?
Data centers are becoming a significant component of national electricity demand.
Berkeley Lab’s June 2026 United States Data Center Energy Usage Report: 2025 Update estimates 649 TWh of U.S. data center electricity consumption in 2030 in its reference case, equivalent to approximately 11.8% of total U.S. electricity use.
The scale of expected growth is also affecting transmission planning. The U.S. Department of Energy’s 2026 National Transmission Needs Study specifically identifies load growth from data centers among the pressures creating additional transmission needs.
Why Do Data Centers Use So Much Power?
The servers themselves are the primary reason.
But data center electricity usage includes much more than servers.
A facility may power:
- CPUs
- GPUs
- Storage
- Networking
- Cooling equipment
- Pumps
- Fans
- UPS systems
- Power conversion
- Lighting
- Security and monitoring systems
Our guide explaining how data centers work breaks down the relationship between power, cooling and networking.
Why AI Data Centers Can Require So Much Electricity
AI changes the equation because modern AI workloads can require massive clusters of high-performance accelerators.
These systems can operate at very high power density.
More computing electricity also produces more heat.
That means higher-density AI infrastructure may require additional:
- Cooling
- Pumps
- Heat exchangers
- Electrical distribution
- Backup capacity
At campus scale, those requirements can contribute to power requests measured in hundreds of megawatts.
IT Load vs. Total Facility Load
Suppose the IT equipment in a facility uses 100 MW.
The building itself may consume more than 100 MW because cooling and electrical infrastructure also need electricity.
This relationship is measured using Power Usage Effectiveness, or PUE.
For example:
- IT load: 100 MW
- Total facility load: 120 MW
- PUE: 1.20
Our guide to PUE and WUE metrics explains this calculation and its limitations.
How Much Electricity Would a 500 MW Data Center Use?
At a hypothetical constant 500 MW load:
500 MW × 8,760 hours = 4,380,000 MWh
That’s:
4.38 TWh per year.
Again, that is a theoretical constant-load calculation rather than a prediction for a particular facility.
But it demonstrates why a single large campus can matter to a utility.
How Much Power Would a 1 GW Data Center Use?
One gigawatt equals:
1,000 MW.
At a constant theoretical 1 GW load:
1,000 MW × 8,760 hours = 8.76 TWh per year.
Large campuses are generally built in stages, so a planned 1 GW campus would not necessarily consume that much electricity immediately.
Utilities instead evaluate the project’s expected load ramp:
- Initial phase
- Subsequent buildings
- Future expansion
- Full build-out
That phasing determines when substations, transformers and potentially new data center transmission lines may be required.
Why Data Center Power Consumption Matters Locally
National percentages can hide regional concentration.
Data centers cluster around specific locations with:
- Fiber connectivity
- Available land
- Utility capacity
- Tax advantages
- Existing technology ecosystems
That means local effects can be substantially larger than national averages suggest.
A large new facility could contribute to requirements for:
- New substations
- Transformers
- Transmission upgrades
- Additional generation
- Utility tariff changes
- Long-term grid investment
Our existing guide to data centers and the power grid explains how utilities evaluate these loads.
Does a Data Center Use Maximum Power 24/7?
Not necessarily.
An announced MW figure could represent:
- Maximum utility service
- Full-build-out demand
- Contracted capacity
- Planned future capacity
- Nameplate capacity
That is why public officials should ask developers for two numbers:
Maximum expected demand in MW
and
Expected annual energy consumption in MWh or GWh.
They answer different questions.
Frequently Asked Questions
How much power does a data center use?
Data centers can range from a few megawatts to hundreds of megawatts. Very large campuses can contemplate 1 GW or more of ultimate capacity.
How much electricity does a 100 MW data center use?
At a constant 100 MW load for an entire year, it would theoretically consume 876,000 MWh.
What is one megawatt?
One megawatt equals 1,000 kilowatts or 1 million watts.
Do AI data centers use more power?
AI infrastructure can create extremely high power densities because large GPU clusters require substantial electricity.
Do data centers run at maximum power constantly?
Not necessarily. Maximum capacity and actual operating load are different measurements.
Bottom Line
How much power does a data center use?
There is no single answer.
Smaller facilities may require only a few megawatts. Major hyperscale and AI campuses can require hundreds of megawatts.
The critical distinction is between power measured in MW and energy consumed over time measured in MWh, GWh or TWh.
Understanding that difference is essential when evaluating what a proposed data center actually means for a community’s electrical system.
