Union Electric unites electricity and natural gas services under the Gateway Arch. The utility (a subsidiary of Ameren) operates as Ameren Missouri and serves 1.2 million power customers and 127,000 gas customers. The utility's service territory includes 57 Missouri counties; more than half of its customers reside in the St. Louis metropolitan area. The company owns about 3,270 miles of natural gas transmission and distribution mains and 33,000 of electric distribution lines (and 295 miles of power transmission lines). Ameren Missouri owns or has interests in nine power plants (primarily thermal) with a capacity of almost 10,300 MW, and it also engages in wholesale power transactions.
The company serves customers in a 24,000-square-mile area service area (57 counties) in central and eastern Missouri.
Ameren Missouri accounts for about 60% of parent Ameren's total power generation capacity.
The utility's revenues dropped by 3% in 2012 primarily due to a rate decrease and warmer-than-usual weather decreasing gas and power demand.
On the flip side, in 2012 Ameren Missouri’s net income increased by 44% thanks to lower operating costs.
In 2011 the company announced a major environmental compliance strategy to meet stringent federal requirements for significant reductions in sulfur dioxide emissions by securing a long-term contract for 91 million tons of ultra-low sulfur coal from Peabody Energy through 2017. The purchase of the cleaner coal, along with the already completed installation of $600 million-worth of scrubbers at its fossil-fueled power plants allows Ameren Missouri to avoid needing to make additional expensive plant retrofits and making major rate hikes.
Ameren Missouri was founded in 1922 and is the successor of a number of companies, the oldest of which was set up in 1881.
Seeking to bring down power costs for its business customers, in 2009 the company launched Business Energy Efficiency Program. In the first year of operating the scheme the company received more than 1,000 applications from business customers for the installation of more efficient lighting, motors, heating/ventilation/air conditioning (HVAC), and refrigeration units, and paid out more than $1.8 million in program incentives.
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