Aquila, Inc. was an electricity and natural gas distribution network headquartered in Kansas City, Missouri in the United States. The company also owned and operated power generation assets. It previously operated under the name UtiliCorp United, Inc.The company at one time ranked #33 on the Fortune 500 list.On February 6, 2007, the company announced plans for a merger valued at $1.7 billion to become a wholly owned subsidiary of Great Plains Energy.