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PJM Interconnection, which oversees a 56,350-mile section of the North American power transmission grid that spans across 13 northeastern and midwestern states and the District of Columbia. The regional transmission organization monitors and coordinates the movement of wholesale electricity in its service territory; its more than 560 members have a combined generating capacity of about 164,000 MW. Sanctioned by the Federal Energy Regulatory Commission, PJM is charged with ensuring fair competition among power purchasers, sellers, and traders; it also is responsible for the reliable delivery of distributed electricity to about 51 million consumers in its territory.

Platte River Power Authority supplies wholesale electricity to four municipalities (Estes Park, Fort Collins, Longmont, and Loveland) in northern Colorado, which in turn serve more than 140,500 residences and businesses. The utility, which is a political subdivision of the state of Colorado, has interests in fossil-fueled and wind-powered generation facilities; it also operates transmission assets and acts as a wholesale electric utility, acquiring, constructing and operating generation capacity and supplying electric energy on an as needed basis. Platte River Power Authority evolved from the Platte River Municipal Power Association, a consortium of 31 municipalities.

Portland General Electric (PGE) keeps many Birkenstock-shod feet warm: The company, formerly a subsidiary of Enron, generates, purchases, and distributes electricity to about 815,750 customers in Oregon. PGE's service territory covers 52 cities, including Portland and Salem. Its hydroelectric, coal-fired, and gas-fired plants had a generating capacity of more than 2,600 MW in 2009, and it purchased another 1,920 MW of generating capacity. PGE also markets wholesale electricity and natural gas to other utilities and marketers in the western US. In keeping with the "green" image of Portland residents, PGE leads the nation in residential customers who purchase power from renewable sources.

Powerco is the second-largest distributor of electricity and gas in New Zealand (behind state-owned Genesis Energy). Powerco's network extends across the upper central and lower central North Island and services to 415,000 customers. Its infrastructure represents about 46% of the gas connections and 16% of the electricity connections in New Zealand. The company's Powerco Transmission Services unit is a leading provider of wind farm connections to New Zealand's national grid. Powerco is 58%-owned by investment firm Queensland Investment Corp. and 42% by Australia-based infrastructure group Babcock & Brown Infrastructure.

Alabamans and Floridians come together in PowerSouth Energy Cooperative (formerly Alabama Electric Cooperative), which provides wholesale power services to its member-owners (20 cooperative and municipal distribution utilities and one industrial company). Its distribution members provide electric services to almost 419,000 meters in central and southern Alabama (39 counties) and western Florida (10 counties). PowerSouth Energy Cooperative operates a 2,200-mile power transmission system and has more than 1,600 MW of generating capacity from interests in fossil-fueled and hydroelectric power plants.

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