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.

The dryly named electric utility Electric Power Development Co. has a much more fun nickname -- J-POWER. With a generating capacity of 16,380 MW, the company supplies power used all over Japan. It has 67 hydroelectric plants, as well as some thermal and geothermal plants, and owns a transmission network that covers 2,400 km. J-POWER acts as a wholesale electric utility, selling to other electric power companies. Established by the Japanese government in 1952, J-POWER went through the privatization process, finally achieving full privatization and trading on the Tokyo Stock Exchange in 2004. The company is also sometimes referred to as EPDC.

Summit Energy Services is a major provider of energy management and procurement services for industrial and commercial companies, and operates in 56 countries. A consolidator in a fragmented industry, the company's offerings include market intelligence reporting, need and competitive supply analysis, contract negotiation, utility bill auditing, risk advisory planning, and energy efficiency projects. It serves the automotive, healthcare, transportation, and food industries, as well as chemical, metal, paper, and plastic manufacturing companies, and municipal and state governments and hospitality and real estate management enterprises. Summit Energy Services has more than 650 clients.

Better PLC, or Better Place as it goes by, wants people to imagine a world free of oil. The startup, which was founded in 2007 on $200 million of venture capital, is teaming with automakers, battery manufacturers, energy companies, and governments to help make electric cars more viable worldwide. As an alternative to traditional gas stations, the company is attempting to build and operate an electric recharge grid to power electric car battery recharging stations, which drivers pay to access (much as phone users pay to access a mobile network). Better Place has begun work with partners in Australia, China, Denmark, Israel, Japan,and the US on this sustainable model. The company was founded by CEO Shai Agassi.

Clyde Bergemman EEC designs and supplies custom-engineered air-pollution control systems and offers related services. Its systems scrub out dust and acid gases from plant emissions to meet strict regulations. Customers include power generators and paper and pulp producers. Its products include ammonia-on-demand systems (which control emissions from power generators), electrostatic precipitators, and fabric filtration systems. The company is a unit of energy services provider Clyde Bergemman Power Group.

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.

Hongkong Electric Holdings Limited, an investment holding company, engages in the generation, transmission, and distribution of electricity to commercial and industrial customers in Hong Kong and internationally. It holds interests in eight coal-fired units, five gas turbine units, two combined cycle units, and one wind turbine. The company also offers engineering consulting services to the electricity supply industry; and engages in advertising and financing activities. It operates in Australia, Thailand, Canada, the United Kingdom, New Zealand, and mainland China. The company was founded in 1889 and is based in Hong Kong, Hong Kong.

Consolidated Water Co. Ltd. and its subsidiaries develop and operate seawater desalination plants and water distribution systems, as well as produce and supply water to customers in the Cayman Islands, the Bahamas, Belize, the British Virgin Islands, and Bermuda. It uses reverse osmosis technology to convert seawater to potable water. The company supplies water to end-users, including residential, commercial, and government customers. As of December 31, 2009, Consolidated Water Co. operated 16 reverse osmosis desalination plants through its subsidiaries and affiliates. It also offers engineering and management services, including designing and constructing desalination plants, and managing and operating desalination plants owned by other companies. The company was founded in 1973 and is based in Grand Cayman, Cayman Islands.

SCS Tracer Environmental traces its financial success to its large portfolio of environmental engineering, consulting, and monitoring services. Among the firm's specialties are ambient air monitoring, counter-terrorism support, environmental advisory services and environmental construction, permitting and compliance, and risk management and safety, and research and development. In addition to private sector clients, the company also works on contracts for the federal government. SCS Tracer's staff includes atmospheric scientists, engineers, and meteorologists. The firm was named Tracer Environmental Sciences & Technologies until being acquired by SCS Engineers in late 2009.

Although South Central Power Company may sound like a power plant in Watts, Los Angeles, it is in fact a member-owned cooperative that provides electricity to consumers and businesses in southern Ohio. An affiliate of the nationwide Touchstone Energy Cooperative network, the electric cooperative provides power to more than 110,000 customers over more than 11,000 miles of power lines. In addition to distributing electricity, South Central Power also provides outdoor lighting, surge suppression products, security systems, water heater switches, and other energy-related services.

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