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According to this link someone else found [1], they claim to use 0.0003 kWh electricity per amortized search, which at e.g. 0.06 USD/kWh (typical [2]) is 1.8*10

by uvdiv 16y ago

According to this link someone else found [1], they claim to use 0.0003 kWh electricity per amortized search, which at e.g. 0.06 USD/kWh (typical [2]) is 1.8*10^-5 USD, or 0.26% of search costs (according to the estimates in the article). [1] http://googleblog.blogspot.com/2009/01/powering-google-search.html http://googleblog.blogspot.com/2009/01/powering-google-searc... [2] http://www.eia.doe.gov/cneaf/electricity/epm/table5_6_a.html http://www.eia.doe.gov/cneaf/electricity/epm/table5_6_a.html

uvdiv 16y ago
(In a related estimate, 0.0003 kWh/search means 54 CPU-core-seconds of indexing per search, assuming (without any justification and probably wrongly) that (i) most electricity consumption is by CPUs during indexing and (ii) they are using x86 machines with about 20W/core power consumption. I'm sure someone else here can fix/improve this estimate.)