At national average rates, the facility's electricity use implies 3.9 to 7.9 billion
gallons of water consumed each year, with a central estimate of 5.1 billion gallons, or
about 14 million gallons a day. Most of that is consumed at the power plants that
generate its electricity. The share consumed on site for cooling would be roughly 290
to 590 million gallons a year. No cooling design has been disclosed, so the actual
figure could be higher or lower.
How this was calculated
Definitions:
- Direct water: water consumed at the data center itself, mainly for cooling
- Indirect water: water consumed at the power plants that generate the data center's electricity, which are themselves cooled with water
- Consumed: water that is evaporated or otherwise not returned to its source
- Water intensity: gallons of water consumed per unit of electricity used
- Household equivalent: the number of average households whose home water use would equal the facility's total water consumption
The water estimate starts from the facility's annual electricity use (see the
electricity estimate above) and applies national average water intensities from
Lawrence Berkeley National Laboratory's 2023 estimates
(Shehabi et al., 2024). In 2023, U.S.
data centers used 176 TWh of electricity and consumed:
- 17 billion gallons of water directly
- 211 billion gallons of water indirectly
Dividing by electricity use gives the national water intensity:
- Direct: 17 billion gallons / 176 TWh = 96.6 million gallons per TWh
- Indirect: 211 billion gallons / 176 TWh = 1.199 billion gallons per TWh
The total water is calculated as:
- Annual electricity use x water intensity
Applying these intensities to the three electricity scenarios yields:
Minimum (50% utilization, PUE 1.145; 3.01 TWh):
- Direct: 3.01 TWh x 96.6 million gal/TWh = 291 million gallons
- Indirect: 3.01 TWh x 1.199 billion gal/TWh = 3.61 billion gallons
- Total: 3.90 billion gallons (annually)
Central (65% utilization, PUE 1.145; 3.91 TWh):
- Direct: 3.91 TWh x 96.6 million gal/TWh = 378 million gallons
- Indirect: 3.91 TWh x 1.199 billion gal/TWh = 4.69 billion gallons
- Total: 5.07 billion gallons (annually), or about 13.9 million gallons per day
Maximum (80% utilization, PUE 1.45; 6.10 TWh):
- Direct: 6.10 TWh x 96.6 million gal/TWh = 589 million gallons
- Indirect: 6.10 TWh x 1.199 billion gal/TWh = 7.31 billion gallons
- Total: 7.90 billion gallons (annually)
To put the totals in context, we compare them with household water use. The average
U.S. household uses about 300 gallons of water per day at home and Berkeley County has
49,384 households.
The household equivalent is calculated as:
- Total gallons per year / 365 days per year / 300 gallons per household per day
This yields:
- Minimum: 3,898,100,455 gallons / 365 / 300 = about 35,600 households (72% of county households)
- Central: 5,067,530,591 gallons / 365 / 300 = about 46,300 households (94% of county households)
- Maximum: 7,898,334,545 gallons / 365 / 300 = about 72,100 households (146% of county households)
For comparison, the home water use of all 49,384 county households is about 5.4 billion
gallons a year (49,384 households x 300 gallons x 365 days = 5,407,548,000 gallons).
This comparison describes the size of the facility's total water footprint. It does
not mean the facility would draw that much from Berkeley County's water supply, since
most of the total is consumed at power plants.
Note: These are national averages applied to one facility. Actual direct water use
depends on the cooling design, which has not been disclosed. A facility using
evaporative cooling could consume more than this estimate. One using closed-loop
cooling with dry coolers could consume far less. Actual indirect water use depends
on the mix of power plants supplying the site. The majority of the indirect water
consumption is displaced outside Berkeley County.