Pinnacle West Capital is at the peak of the energy pyramid in Arizona. It is the holding company for the state's largest electric utility, Arizona Public Service (APS), which transmits and distributes electricity to 1.1 million residential, commercial, and industrial customers throughout most of the state. The utility also has more than 6,280 MW of generating capacity. Through APS and other subsidiaries, Pinnacle West markets wholesale and retail power in Arizona and the western US. The company also develops and manages real estate and invests in energy ventures.

Middle Tennessee Electric Membership Corporation's service territory is smack dab in the middle of Tennessee. The utility company distributes electricity to about 180,000 residential and business customers (member/owners) in four counties (Cannon, Rutherford, Williamson, and Wilson), via 10,000 miles of power lines connected to about 30 electric distribution substations. Middle Tennessee Electric purchases its power supply from the Tennessee Valley Authority. The corporation is Tennessee's largest electric cooperative and the sixth largest in the US.

RMT furnishes environmental engineering and consulting services to businesses that want to keep it clean. The company's services include solid waste management, liability reduction and remediation, air quality management, employee health and safety management, construction contracting, energy and alternative energy management, wastewater treatment, and data management services. RMT serves customers in the cement, chemicals, solid waste, electricity, forest products, metals, oil and gas, and textiles industries. Part of Alliant Energy's Integrated Services division, RMT operates 12 US offices with single locations in France and the UK.

San Diego Gas & Electric (SDG&E) digs doling out energy in sandy Southern California. The company is a regulated utility that serves 1.4 million electricity customers and more than 840,000 natural gas customers in San Diego County and a portion of southern Orange County. The electric utility segment owns about 22,200 miles of power distribution lines, which serve about 25 communities; its 1,870 miles of transmission lines are managed by the California Independent System Operator. SDG&E also has limited power generation operations (it owns or contracts more than 5,500 MW of generating capacity). The gas utility operates almost 170 miles of transmission pipelines and about 8,420 miles of distribution mains.

Macao Water Supply Co. Ltd,the utility supplies its customers with water from the West River's Modaomen Channel in Zhuhai City. Because of the high salinity content in the water (especially in the winter and spring months), Macao Water Supply uses a system of holding tanks and purification stations. Founded in 1932, the company is a subsidiary of Sino-French Holdings (Hong Kong) Limited (a joint venture of France-based water utility Ondeo Services and Hong Kong-based NWS Holdings Limited). As part of an ongoing maintenance strategy the company has replaced or repaired all of the distribution network that was in place in 1982.

Sempra Energy, together with its subsidiaries, engages in the development of energy infrastructure, operation of utilities, and provision of energy-related products and services worldwide. It operates through two divisions, Sempra Utilities and Sempra Global. The Sempra Utilities division includes San Diego Gas & Electric, a regulated public utility that provides electric generation, transmission, and distribution services to 3.5 million consumers, and natural gas distribution services to 3.2 million consumers; and Southern California Gas, a regulated public utility that provides natural gas distribution, transmission and storage services to a population of 20.7 million. The Sempra Global division comprises of Sempra Commodities, a commodities-marketing business operating under the joint venture, RBS Sempra Commodities, with The Royal Bank of Scotland; Sempra Generation, which develops, owns and operates, or holds interest in electric power plants serving wholesale electricity markets in North America; Sempra Pipelines & Storage that develops, owns, operates, or holds interests in natural gas pipelines and storage facilities in the United States and Mexico, as well as in companies that provide natural gas or electric services in Argentina, Chile, Mexico, and Peru; and Sempra LNG, which develops, owns, and operates receipt terminals for importing liquefied natural gas. Sempra Energy was founded in 1998 and is headquartered in San Diego, California.

Kansas Electric Power Cooperative, Inc. (KEPCo), headquartered at Topeka, Kansas, was incorporated in 1975 as a not-for-profit generation and transmission (G & T) cooperative. It is KEPCo's responsibility to procure an adequate and reliable power supply for its 19 distribution rural electric cooperative Members at a reasonable cost. Through their combined resources, KEPCo Members support a wide range of other services such as rural economic development, marketing and diversification opportunities, power requirement and engineering studies, and rate design, among others.KEPCo is governed by a Board of Trustees representing each of its 19 Members which collectively serve more than 110,000 electric meters in the eastern two-thirds of rural Kansas (see map). The KEPCo Board of Trustees meets regularly to establish policies and act on issues that often include recommendations from working committees of the Board and KEPCo staff.

YTL is hot, thanks to having many irons in many different fires. Incorporated in 1955, the Malaysian conglomerate is primarily engaged in utilities and construction, although it is also active in high-speed rail, cement manufacturing, residential property development, hotel and resort management, and technology incubation. In addition to providing electricity to residents in Malaysia, Indonesia, and Australia, YTL owns Wessex Water, a leading water and sewerage operator in the UK. Construction arm Syarikat Pembenaan Yeoh Tiong Lay offers construction services for schools, army barracks, hospitals, hotels, and other large infrastructure projects. Chairman Yeoh Tiong Lay and his sons own 47% of the company.

UniSource Energy has more than one source of income, but it gets most of its revenues from its energy utilities. The company's Tucson Electric Power unit generates and distributes electricity to almost 402,000 customers in southeastern Arizona. The unit has about 2,230 MW of generating capacity. Subsidiary UniSource Energy Services provides electricity (through UNS Electric Services) to 90,000 customers and natural gas (through UNS Gas) to 146,000 customers in 30 communities in northern and southern areas of the state. UniSource's Millennium Energy Holdings unit invests in unregulated energy and emerging technology companies.

Canadian Utilities is the strong arm of diversified energy company ATCO and accounts for most of its sales. Canadian Utilities' regulated utilities operations are ATCO Gas, which distributes natural gas to more than 1 million customers in almost 300 communities in Alberta, and ATCO Electric, which provides electricity to about 207,000 customers. ATCO Pipelines provides natural gas transportation services to producers, major industrial users and gas distribution companies in Alberta. Canadian Utilities' Energy unit (including ATCO Power, ATCO Midstream and ATCO Energy Solutions) manages power generation and pipeline activities. The Technologies segment provide business systems solution through ARCO I-Tek.

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