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.

Kissimmee Utility Authority (KUA) is committed to redoubling efforts to serve this Florida city with three double letters in its name. KUA operates the municipal power distribution system serving 62,000 commercial and industrial, and residential customers in Kissimmee and surrounding areas. It also offers its customers internet, telephone, and security services. In addition, the community-owned utility has stakes in some power generation units. The century-old company is used to managing operations in a hurricane prone area. In 2009 the company piloted a 4-day working week option for its employees as a way to bring down costs.

NSTAR is looking to outshine its rivals through the efficiency of its regulated electric and natural gas sales, distribution, and transmission operations. The utility holding company transmits and distributes electricity to almost 1.2 million homes and businesses through NSTAR Electric and serves some 300,000 natural gas customers in Massachusetts through NSTAR Gas. The company also markets wholesale electricity, and operates liquefied natural gas (LNG) processing and storage facilities. Its NSTAR Communications unit owns about 240 miles of fiber optic network. In 2010 the company agreed to be acquired by Northeast Utilities for about $4.2 billion.

Through its regulated utility subsidiaries, Aquarion distributes water to more than 180,000 homes and businesses (or about 580,000 people) in some 39 communities in Connecticut, Massachusetts, and New Hampshire. It is one of the 10 largest investor-owned utilities in the US. The company's Aquarion Services unit provides contract management of municipal water and wastewater systems, along with engineering and management consulting services and consumer water line protection plans. In 2007 UK-based Kelda Group sold control of Aquarion to Australia's Macquarie Bank for $860 million.

Sembcorp Industries can help your ship keep its shape or sell you electricity, among other things. Its 62%-held Sembcorp Marine subsidiary, the #2 offshore oil rig maker in the world, specializes in marine and offshore engineering services such as ship building and conversion, repair, and rig building. Sembcorp Utilities (also known as SembUtilities) is a leading retailer of electricity in Singapore; it also provides utility services and water management services (wastewater, reclaimed water, desalination, water for industrial use). Singapore's government (through investment company Temasek Holdings) controls 49% of Sembcorp Industries, which serves clients primarily in the Asia/Pacific region and in Europe.

Midwesterners can feel the power, thanks to Midwest Independent Transmission System Operator (Midwest ISO), which monitors and coordinates the operation of an electric transmission system with 56,300 miles of transmission lines across 13 Midwestern states and one Canadian province. It manages energy markets with almost $23 billion in annual energy transactions. The Regional Transmission Organization (RTO) ensures fair access to the grid and facilitates communication between its members, which include investor-owned, cooperative, and municipal utilities, as well as power marketers and independent transmission companies. Midwest ISO also provides wholesale electric service across much of the region.

Tokyo Electric Power Company (TEPCO), which supplies power to a population of 44 million customers in Tokyo, Yokohama, and the rest of the Kanto region. One of the world's largest electric utilities, TEPCO's 190 power plants have the generating capacity of approximately 64,000 MW, primarily produced by thermal, nuclear, and hydroelectric power sources. Through interests in telecom businesses, the company offers telephony and Internet services; it also has international consulting and power generation operations. Other businesses include construction, real estate, and transportation companies. It also invests in independent power producers in other countries.

Public Works Commission of the City of Fayetteville, North Carolina (PWC), which is responsible for operating, maintaining, and upgrading the municipal electric, water, and wastewater utility systems. PWC distributes electricity and water to more than 78,000 residential, commercial, and industrial customers. The electric utility has about 930 miles of underground power lines, 24,100 distribution line transformers and more than 47,160 poles. The water utility has 1,260 miles of mains; the wastewater unit, 1,180 miles of sewer line.

Calvalley Petroleum searches below the plateau for fuel for its customers. The company focuses on exploring for and producing oil and natural gas at Block 9 in the Republic of Yemen. The company, which has about 16 working wells (more than 50 have been drilled), produces some 5,000 barrels of oil each day. Its subsidiary Calvalley Petroleum (Cyprus) Ltd. is the operator of the property, which includes about 552,000 acres of land in the Sayun-Masila basin. Calvalley Petroleum has a net proved plus probable reserves of 7.8 billion barrels of oil equivalent.

Wolf Creek Nuclear Operating Corporation (WCNOC) helps to sate the energy hunger of the US public. The nuclear plant operator is in charge of the Wolf Creek Generating Station in Kansas, which houses a four-loop pressurized water reactor that generates about 1,200 MW of electricity (enough to power some 800,000 homes). WCNOC is joint venture between Westar Energy, which owns a 47% stake, Great Plains Energy (which through subsidiary Kansas City Power & Light owns 47%), and Kansas Electric Power Cooperative, 6%. Its job description is to operate, maintain, repair, and eventually decommission the Wolf Creek Generating Station.

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