David Wilks, President of Energy Supply, Xcel Energy Services Inc. testifies before the US Senate Committee on Energy and Natural Resources full committee hearing on the role of natural gas in mitigating climate change on October 28, 2009 on Capitol Hill in Washington, DC. Getty Images logo Getty Images 28 months ago

David Wilks, President of Energy Supply, Xcel Energy Services Inc. testifies before the US Senate Committee on Energy and Natural Resources full committee hearing on the role of natural gas in mitigating climate change on October 28, 2009 on Capitol Hill in Washington, DC.

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