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You measure it with PUE. Google has zero incentive to drive towards an inefficient solution, they just want to be free to come up with newer, better solutions to obtain efficiency.

It seems to be a grouping of power-hogs who want to claim to be environmentally friendly. Don't get me wrong, I'm not saying that it won't do some good, but until it get a few organizations like GreenPeace as members, and asks them to audit its standards, then nobody should take it too seriously.
The Green Grid: Members List

Here's to help you what a PUE is.

Such as http://www.thegreengrid.org/home

From TheGreenGrid consortium

Conventional models for estimating the electrical efficiency of datacenters are grossly inaccurate for real-world installations. Currently, many manufacturers provide efficiency data for power and cooling equipment. For power equipment, efficiency is typically expressed as the percent of power out to power in. For cooling equipment, efficiency is typically expressed as the ratio of heat removed to electrical input power (coefficient of performance). Unfortunately, these individual values of efficiency often lead people to think that the efficiency losses of a datacenter can be determined by simply adding up the inefficiencies of various components.

From TheGreenGrid consortium

Conventional models for estimating the electrical efficiency of datacenters are grossly inaccurate for real-world installations. Currently, many manufacturers provide efficiency data for power and cooling equipment. For power equipment, efficiency is typically expressed as the percent of power out to power in. For cooling equipment, efficiency is typically expressed as the ratio of heat removed to electrical input power (coefficient of performance). Unfortunately, these individual values of efficiency often lead people to think that the efficiency losses of a datacenter can be determined by simply adding up the inefficiencies of various components.