Consider Renewable Energy for your datacentres

Cost
LOW
Cost
MEDIUM
Cost
HIGH
EFFORT
low
EFFORT
medium
EFFORT
HIGH
IMPACT
low
IMPACT
MEDIUM
IMPACT
HIGH

Datacentres' carbon footprint is relatively high due to their energy consumption. After reducing datacentres' energy consumption (see solution above and in green hardware and e-waste), the second step is to turn to greener energy sources and adapt your organization accordingly.

Indeed, solar energy is unfortunately not a 24x7 hours source, as a result, you may also depend on purchasing energy credits if you want to become carbon neutral.

At least, you may consider shifting recurrent computing tasks to times when solar energy sources are available. See more in the International Energy Agency (IEA) report.

Another way to save energy for datacentres may lie within microgrids to deploy automated distributed systems to save and optimize all energy consumption. More information here.  

200 TWh per year

is the yearly electricity consumption rough estimate of worldwide datacentres. It is more than the electricity consumption of countries like Argentina or Ukraine.
(energy council)

100 billion liters

of water is the estimated needed volume to cooldown all datacentres based in the US.
(Nature)

ADDITIONAL RESOURCES

Some major US enterprises are deploying solar infrastructures for their data centres. Have a look here or there.