Orival manufactures self-cleaning water filters, automatic water filters, and strainers for industrial and agricultural use as irrigation filters, cooling tower filters, industrial water filters, and HVAC filters. The company has installed units in more than 40 countries. Orival's products are flexible in design so that the company can cater to a wide range of customized orders and local requirements -- form single units, flange-to-flange systems, and complete skid mounted packages, to diverse construction standards, alternate flanges, and voltage standards.

Enerchina Holdings focuses on offering a variety of energy and public utility services in about 40 cities in China. The company generates electrical power, as well as provides more than 400,000 tons of natural gas every year through Panva Gas Holdings. Panva also offers pipeline network construction, transportation, storage, and wholesale of natural gas. Enerchina Holdings serves more than 3 million customers. The company is researching and developing other clean energy sources, including different uses of coal. Chairman Ou Yaping owns about 52% of Enerchina Holdings.

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.

Southern Californians soak up the sun, and the energy. The latter is where Southern California Public Power Authority comes in. The power authority generates and transmits electricity for 10 municipal distribution utilities and one irrigation district in southwestern California. Members include the municipal utilities of the cities Anaheim, Burbank, Colton, Glendale, Los Angeles, Pasadena, and Riverside. The authority has interests in three power plants and three transmission projects in the western US. It is constructing a fourth generation project. Southern California Public Power Authority also provides legislative representation and cost efficiency services to its members.

Withlacoochee River Electric Cooperative keeps the power flowing to the residences and businesses of more than 200,360 member-owners in five counties along the central Florida Gulf Coast. The power distribution utility, which was originally set up in 1941, receives wholesale generation and transmission services from the Seminole Electric Cooperative. Withlacoochee River Electric, a non-profit organization, returns any funds remaining at the end of each year to its membership. The cooperative has returned more than $190 million to its member-owners.

ITC Holdings Corp. (NYSE: ITC) invests in the electricity transmission grid to improve electric reliability, expand access to markets, lower the overall cost of delivered energy and allow new generating resources to interconnect to its transmission systems. The largest independent electricity transmission company in the country, ITC operates high-voltage transmission systems in Michigan’s Lower Peninsula and portions of Iowa, Minnesota, Illinois, Missouri and Kansas, serving a combined peak load in excess of 25,000 megawatts through its regulated operating subsidiaries, ITCTransmission, Michigan Electric Transmission Company (METC), ITC Midwest and ITC Great Plains. ITC also focuses on new areas where significant transmission system improvements are needed through ITC Grid Development and its subsidiaries.

Siemens Water Technologies Corp. company is a leading producer of water- and wastewater-treatment equipment worldwide. Through its Water and Wastewater Systems and Water Services and Products groups, Siemens Water Technologies provides services to municipal, industrial, and institutional clients. It has more than 200,000 installations on several continents and a portfolio of more than 900 water treatment products and technologies. Among its other services are ion exchange resin recycling and thermal reactivation processes that reduce carbon expenditure. The company is a subsidiary of Siemens Industry.

Calpine Corporation, an independent wholesale power generation company, engages in the ownership and operation of natural gas-fired and geothermal power plants in North America. It generates electricity and produces steam from natural gas-fired combustion and renewable geothermal facilities. The company sells wholesale power, steam, capacity, renewable energy credits, and ancillary services to utilities, independent electric system operators, industrial and agricultural companies, retail power providers, municipalities, and power marketers. As of December 31, 2009, the company had a portfolio of 77 operating power plants with an aggregate generation capacity of approximately 24,802 megawatts. Calpine Corporation was founded in 1984 and is based in Houston, Texas.

EcoWater Systems is in a pristine spot. The company manufactures commercial and residential water treatment systems. It sells its products through a network of more than 1,400 dealers, wholesalers, and private-label retailers. Products include water refiners, conditioners, and purifiers, and innovations such as reverse osmosis drinking water systems. Founded in 1925, EcoWater Systems is a member of Berkshire Hathaway's Marmon Group and maintains its autonomous management. In addition to the US, the company operates in Canada, the UK, Europe, and China.

Trans-Elect has elected itself as a cross-border power company. The independent transmission company owns and operates about 12,600 miles of high-voltage power lines in portions of Canada and the US. The company acts as a wholesale provider of electricity to distribution companies. It operates the former transmission assets of of US utility Consumers Energy; it is also part of an international consortium that operates the former transmission assets of Canadian power distributor TransAlta. The acquisitions were the first of their kind in the deregulating North American electricity market. Trans-Elect is also involved in several expansion projects in congested areas of the US grid.

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