1. A system comprising:(a) a data center comprising a building housing:
(i) computers, data storage devices, servers, switches, routers, vaults, load balancers, racks and wire cages or closets, and
(ii) a water cooling subsystem comprising a water intake and configured to receive cool water and output warm water, wherein the cool water is received from a water source that is an ocean or sea by the water intake positioned at a depth of 15 m or more in the water source, wherein the data center has a power usage effectiveness (PUE) less than 2, wherein the PUE is the ratio of the total facility power entering the data center to the power used by information technology equipment of the data center;
(b) a water desalination plant that is distinct from and co-located with the data center and configured to receive output warm water from the data center and desalinate the output warm water received from the data center to produce potable water or water suitable for irrigation from the output warm water, wherein the water desalination plant further comprises a water discharge for discharging brine from the water desalination plant into the water source and the water desalination plant is co-located with the data center on land; and
(c) a power plant comprising a facility that houses components for generating power, wherein the facility is distinct from the data center building and co-located with the data center building and the water desalination plant.