Best energy companies in Saint Louis, MO

Peabody Energy (NYSE: BTU) is the world's largest private-sector coal company, with 2009 sales of 244 million tons and $6 billion in revenues. Its coal products fuel 10 percent of all U.S. electricity generation and 2 percent of worldwide electricity.

Spire headquartered in St. Louis, Missouri, is a public utility holding company. The Gas Utility segment serves St. Louis and eastern Missouri through Laclede Gas and serves Kansas City and western Missouri through Missouri Gas Energy. Together they provide more than 1.13 million residential, commercial and industrial customers with safe and reliable natural gas service. Laclede's primary non-utility business, Laclede Energy Resources, Inc., included in the Gas Marketing segment, provides non-regulated natural gas services.

Arch Western Resources, LLC engages in the mining, processing, and marketing of coal with low sulfur content in the United States. It holds interests in two surface mining complexes, Black Thunder and Coal Creek located in Wyoming; four underground mining complexes, including Dugout Canyon, Skyline, Sufco, and West Elk situated in southern Wyoming, Colorado, and Utah; and Arch of Wyoming, a surface mining complex. As of December 31, 2011, the company owned or controlled approximately 2.2 billion tons of proven and probable recoverable reserves. It sells its coal to power plants and industrial facilities. The company was founded in 1998 and is based in St. Louis, Missouri. Arch Western Resources, LLC operates as a subsidiary of Arch Western Acquisition Corp.

Union Electric Company, doing business as Ameren Missouri, operates as a rate-regulated electric generation, transmission, and distribution company in Missouri. It generates electricity through coal, nuclear, hydroelectric, methane gas, and solar energy sources. The company is also involved in the rate-regulated natural gas transmission and distribution business. It supplies electric services to 1.2 million customers and natural gas service to 0.1 million customers to a 24,000-square-mile area in central and eastern Missouri. The company was founded in 1881 and is based in St. Louis, Missouri. Union Electric Company is a subsidiary of Ameren Corporation.

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City Lighting Products commercial lighting company provides commercial lighting to a variety of commercial and retail clients.

Catenary Coal Holdings, Inc. operates as a subsidiary of Arch Coal Inc.

Armstrong Energy is a private company formed in 2006 by management and Yorktown Partners LLC to acquire and develop coal reserves in the Illinois Basin. Through a series of coal reserve purchases and leases, Armstrong controls over 565 million tons of proven and probable coal reserves in Western Kentucky. Armstrong currently operates two underground and three surface mines and sells its coal via barge, rail and truck to utilities located within close proximity to its operations in Western Kentucky, as well as the expanding eastern market in need of high BTU thermal coal.