average house 10,632 kwh
200,000 homes usage 2,126,400 kwh
200k homes cost $540,968
60%savings net
per data center $312,580
The average cost of electricity is $.12 per kWh in the USA.
10,632 kWh x $.12 = $1,275
$1,275 x 200,000 = $255,000,000
$255,000,000 x .60 = $153 million per data center
To my knowledge, there has not been any published studies on the power savings per data center. There are many factors to consider.