Let's cut right to the point: construction materials and mining used to be the lifeblood of Knife River Corporation, but in recent years, its energy and utility operations have grown to be the largest portion of its business. Oil and natural gas production, power transmission, pipelines and power utilities now dominate Knife River's balance sheet. But don't count out its construction services division, which continues to produce record earnings. Knife River has operations in Alaska, Hawaii, Oregon, California, Idaho, Minnesota, Montana, North Dakota, Oregon, Texas, and Wyoming. The company is a subsidiary of MDU Resources Group, Inc.

Zodiac Marine and Pool (formerly Polaris Pool Systems) wants your backyard retreat to be sparkly clean, and your maritime sector to have access to the best in liferafts and inflatable boats. The swimming pool and spa maintenance division manufactures a wide range of automatic pool cleaners, automated chlorinators, and related accessories. The marine division makes inlflatable boats for recreational use and for the military, as well as a toilets, grease separators, marine incinerators, and other environmental equipment for the marine sector. Zodiac Marine and Pool, a Carlyle Group company, has operations throughout the US, as well as in Australia and in Europe.

Northeast Utilities (NU) uses a little Yankee ingenuity (and a number of power generation plants) to keep its customers powered up. The largest utility in New England, NU supplies power to more than 2 million customers in Connecticut, New Hampshire, and Massachusetts through subsidiaries Connecticut Light and Power, Public Service Company of New Hampshire, and Western Massachusetts Electric. The company's power grid encompasses more than 3,100 circuit miles of overhead transmission lines and more than 32,800 pole miles of distribution lines. NU's Yankee Gas utility provides natural gas to 205,000 customers in Connecticut. In 2010 the company offered to buy regional rival NSTAR in for $4.2 billion.

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.

Infiltrator Systems is not connected to The Spy Who Came In From The Cold, spy satellites, or any other relic of Cold War espionage. The company is the world's leading maker of plastic leachfield products used to handle commercial and residential wastewater. Infiltrator Systems' leachfield drainage chambers are a direct and cost-effective replacement for stone and pipe leachfields, and create a footprint only half the size of traditional leachfields. The products, which are made at facilities in Kentucky and Utah, are sold throughout the US. The company estimates that one in four septic systems in the US uses Infiltrator Systems' products.

China Power International Development Limited (China Power) is one of five national power generating groups that construct and operate large power plants in China. The company is a subsidiary of CPI Holding, and is ultimately controlled by China Power Investment Group (CPI Group). China Power owns five high-capacity coal-fired power plants, including the Pingwei Power Plant and the Yaomeng Power Plant. It also has stakes in power plants in Changshu and Shanghai. The company has an installed capacity of more than 9,000 MW. China Power also manages three other power plants, which have a total installed capacity of about 1,300 MW.

Equisol, LLC can't part seas, but it can see to it that water is flowing correctly through the water/wastewater systems at companies. Equisol specializes in supplying water and wastewater products, equipment, and services to industrial, governmental, and commercial industries nationwide. Serving mainly medium to large-sized companies, Equisol does everything from supplying pumps and chlorinators to designing and installing water/wastewater systems. Additionally, the company offers their customers consulting, training, emergency response, and various other services. In 2009 powder coating and technology business Xiom Corp. acquired the company.

Avista Utilities' vista is the Pacific Northwest and the Intermountain West. The utility, a subsidiary of integrated production, transmission, and distribution powerhouse Avista Corporation, provides regulated electricity and natural gas services to residential, commercial, and industrial customers in Idaho, Oregon, and Washington. Avista Utilities provides power and gas services to about 673,000 customers (357,000 electric, and 316,000 gas). It serves power customers with a mix of hydro, natural gas, coal, and biomass generation (with a total capacity of 1,776 MW in 2009), and serves gas customers through purchased wholesale gas supply. The company sells excess electricity to wholesale customers.

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.

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.

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