Megawatts, Megawatt-Hours, and Acres: A Plain-English Guide
Three familiar numbers describe three different things. Reading them correctly starts with the unit—and the boundary behind it.
A project described as “100 megawatts on 200 acres” sounds specific. Yet the numbers leave important questions unanswered. Is the electrical figure a future target or a current load? Does the acreage cover the whole property or the planned development area?
Before comparing projects, separate power, energy, and land area.
Megawatts describe power
A watt measures power. A kilowatt is 1,000 watts; a megawatt is 1,000 kilowatts. EIA distinguishes power at a particular moment from energy used over time. [1]
When an announcement gives a megawatt figure, look for the noun attached to it. Is the figure describing a proposed electrical demand, IT equipment, a utility service arrangement, or a generator? For an accurate comparison, the documents need to define the same thing.
It is also worth asking whether the number applies to one building, one phase, or an entire planned campus. The unit may be correct while the comparison remains misleading.
Megawatt-hours describe energy over time
Energy calculations introduce duration. At a constant 10 MW for two hours, the energy used is 20 MWh. One MWh equals 1,000 kWh. These follow the power-times-duration relationship explained by EIA. [1]
Consider a hypothetical facility averaging 40 MW for 24 hours. The calculation is 40 × 24 = 960 MWh. This is an illustration, not an estimate for an actual data center.
A stated maximum of 100 MW is insufficient to calculate actual annual consumption. For an annual estimate, the calculation needs an average load and an explicit period. Writing the assumptions alongside the result makes the estimate easier to assess and revise.
Know where the measurement begins and ends
The distinction between IT equipment and the whole facility matters. DOE defines power usage effectiveness, or PUE, using total annual facility energy divided by annual IT equipment energy. [2]
In a hypothetical example, 100,000 MWh of annual IT energy at an annual PUE of 1.2 corresponds to 120,000 MWh of total facility energy for the same measurement boundary and period. The example illustrates the ratio; it does not assert a typical performance level.
Do not use an annual energy ratio to claim a precise peak utility demand without additional information. A comparison should preserve both the measurement boundary and the time basis.
Acres describe area
One acre contains 43,560 square feet. [3] A hypothetical 200-acre property therefore contains 8,712,000 square feet of land area. That calculation does not establish building floor area or an electrical capacity.
For a useful land comparison, ask whether each figure represents the entire parcel, the proposed campus, or a particular development phase. An acreage figure alone cannot establish how much equipment can operate there.
There is no conversion in this article from acres to megawatts. Any proposed relationship would need project-specific assumptions rather than unit arithmetic.
A better way to read the headline
For each project, record the power figure and its definition, the energy period if one is stated, the land boundary, and the development phase. Leave missing information marked as missing.
“100 MW planned” is a different statement from “100 MW operating.” “200 acres acquired” is a different statement from “200 acres available for development.” Keeping those distinctions visible makes the numbers more informative—and keeps a neat comparison from saying more than its evidence supports.
Sources
[1] U.S. EIA — Measuring Electricity
Reviewed October 27, 2026. Primary source; follow the link to review the original.
[2] U.S. DOE — Cooling Water Efficiency Opportunities for Federal Data Centers
Reviewed October 27, 2026. Primary source; follow the link to review the original.
[3] NIST — Revised Unit Conversion Factors
Reviewed October 27, 2026. Primary source; follow the link to review the original.
Updates & corrections
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