NEW YORK, United States –Stung by concerns that using Google is bad for the planet, the Internet search giant has revealed exactly how much electricity the company uses and how much greenhouse gases it produces in an effort to show its business model is environmentally friendly.

Experts say it’s true: Watching a video on Google’s Youtube site is indeed more energy-efficient than watching a DVD that had to be manufactured, packaged, shipped, and purchased.

Talking about sustainability is a popular marketing tool, but Google has made renewable energy and environmental protection part of both its corporate identity and its operations in a way that is unique in corporate America. Google’s philanthropic arm funds projects aiming to make renewable energy cheaper than coal power. The company purchases large blocks of renewable energy directly from power generators. Google has invested nearly US$1 billion in renewable energy projects, including wind farms in North Dakota, California and Oregon; solar projects in California and Germany and the beginnings of a transmission system off the East Coast meant to foster the construction of offshore wind farms.

The environment has long been a major concern for co-founder and CEO Larry Page and, since 2007, the company has been paying for projects that remove greenhouse gases from the atmosphere to completely offset its own emissions.

Google’s environmental focus made a 2009 article in the British newspaper The Sunday Times claiming Google searches generated large amounts of greenhouse gases, particularly painful for the company. The article, which caused a stir in the environmental community, said a single Google search generates the same amount of carbon as boiling a kettle of water for tea.

Google defended itself vigorously, and the paper later accepted Google’s contention that most Google searches produce 35 times less carbon than the report suggested. Still, the report, along with concerns that power use by big data centres that Google and others rely on was growing rapidly, prompted Google to conduct detailed studies of the company’s efficiency, power use and greenhouse gas emissions.

In a blog post made public yesterday, Google revealed an unprecedented amount of data about the environmental footprint of its own operations.

“They are concerned, and rightly so, that people think they are bigger (electricity users) than they actually are,” says Noah Horowitz, a Senior Scientist at the Natural Resources c Council who studies efficiency.

Google says it used 2.3 billion kilowatt hours of electricity last year, about the same as what 207,000 US homes would use in a year or the power consumption of about 41 Empire State Buildings, according to Edison Electric Institute, a utility industry trade group.

Google uses about half the power of the biggest power consumers such as oil companies, automakers and steel companies. But that level of consumption does make them a major industrial user, along the lines of a big chemical company, according to John Hughes, the

vice-president for Technical Affairs for the Electricity Consumers Resource Council, a trade group that represents large industrial electric

power consumers.

Rick Needham, director of Green Business Operations at Google, said in an interview that Google will continue to release this data periodically so the company’s progress can be publically tracked. “It holds our own feet to the fire,” he said.

To reduce the impact of all its power use on the environment, Google is buying renewable power, investing in renewable energy projects to help make it more available, making its data centres more efficient and paying for projects that

remove greenhouse gases from the atmosphere, known as carbon offsets.

Also, Google is trying to prove that its business model is far greener than the alternative. Even if data centres use lots of power, using them to run a search on, say, the

legend of Atlantis, uses far less energy than driving to a

library and looking

through an encyclopedia for

the information.

Google, Microsoft and others in the information technology industry are pushing business customers to shift to centralised data centres packed with thousands of computers to store and process data and

run software.

Using this model, called cloud computing, is far more efficient and cheaper for companies than running their own servers, e-mail programmes and other software in in-house information technology departments, according to Jonathan Koomey, a consulting Professor at Stanford University who studies data centre efficiency.

Google says an e-mail

system run on in-house

servers consumes about 75 times more power than Google’s Gmail service.

Other companies that rely on cloud computing, such as the business software company Salesforce.com, have also conducted studies that show cloud computing is more efficient.

The reason is that data centres make better use of their equipment. An in-house data centre in the backroom of a company headquarters requires its own power systems and cooling systems to run computers that are doing far less than they could be. A data centre can process information from around the world at all hours with one heating and cooling system.

Still, data centres use 10 to 20 times more energy per square foot than a typical commercial building, according to the Electric Power Research Institute. And while data centre power use is growing slower than efficiency experts had feared it would in the early part of the last decade, it is still growing fast.

It now accounts for roughly two per cent of the nation’s annual electricity consumption. Fifteen years ago, it was not a factor.

And for every kilo watt-hour used for computing in a typical data centre, nearly a whole additional kilowatt hour is used for running cooling and heating systems.

“Not all clouds are created equally,” says Horowitz. “Some data centres are more efficient than others, and it matters what kind of power they use.”

Google says its data centres are about twice as efficient as typical data centres as measured by a score it publically reveals each quarter, that measures how much power is used directly for computing compared with power used for heating and cooling.

Google says more efficient data centres are a major cost-cutting method for the company because it has to buy less power. Google won’t say how much money it saved, but it says its data centres use about half the power as a typical data centre. Using the national average retail power price for industrial customers, that would make for an annual savings of US$130 million.

That figure does not take into account the extra expense, if any, of designing more efficient data centres.

Facebook and Yahoo have both revealed in recent months that they have built new data centres that are among the most efficient ever built, though not all of their data centres meet that standard.

Horowitz hopes Google’s disclosure prompts other big data centre operators such as Apple, Amazon.com and the US government to also reveal data centre efficiency and work to improve it.