Pall Aeropower, a subsidiary of filtration products maker Pall, manufactures filtration equipment for use in the aerospace and defense industries, as well as for general industrial applications. The company's products are used in aircraft cabin air filtration, fixed wing and rotary wing aircraft, marine vessels, military land vehicles, and space vehicles. Its Portable Fluid Purifier automatically removes water, gases, solvents and particulate matter from coolants, hydraulic and lubrication fluids, and other liquids. The unit sells directly to customers in most of its markets, though Danish company Satair distributes to commercial airlines. Pall Aeropower is part of its parent's industrial business segment.

Pepco Energy Services continues to sail right along. The company provides electricity and natural gas to residential, commercial, industrial, and governmental customers in deregulated areas (primarily the US eastern seaboard, Chicago, and Texas). The nonregulated energy supply company, a subsidiary of Pepco Holdings, offers services in energy management, energy-efficiency consulting, "green power" facilities development and construction, and equipment maintenance. It operates two power plants with a aggregate capacity of 790 MW. Pepco Energy Services also provides its customers the choice of sourcing power from green sources (from solar, wind, and biomass plants).

PG&E Corporation is well on the way to fully recharging its batteries after losing power and declaring bankruptcy following California's energy crisis and the ensuing collapse of the wholesale energy trading industry. Its venerable Pacific Gas and Electric utility serves approximately 5.1 million electric customers and 4.3 million natural gas customers in California. The utility (founded in 1905) is also engaged in electricity generation; procurement and transmission; and natural gas procurement, transportation, and storage. In September 2010 a PG&E utility gas transmission line ruptured in San Bruno, causing a major fire, loss of life, and destruction of, or damage to, about 170 homes.

Plambeck Neue Energien develops and operates renewable power wind farms in Germany and other European countries. The company has developed 74 wind farms in Germany. Plambeck developed its first wind farm -- Windpark Marschland -- in 1995. The company bought SSP Technology A/S, a maker of light and efficient rotor blades based in Denmark. Plambeck has sold its solar business in order to focus on its wind farm operations. In 2006 the company announced plans to join with Evelop to develop an 80-wind turbine offshore wind farm project, Gode Wind I, in Germany. In 2008 Plambeck established a subsidiary in the US.

PNM Resources, Inc. company's primary utility unit, Public Service Company of New Mexico, distributes electricity to nearly 500,000 residential, commercial, and industrial customers in the state. PNM Resources operates power plants with more than 2,700 MW of generating capacity and markets energy to wholesale customers in the western US. Its Texas-New Mexico Power Company (TNMP) unit provides transmission and distribution services at regulated rates to about retail electricity providers that, in turn, provide retail electric service to 230,000 end users. Subsidiary First Choice Power is a retail electric provider operating in Texas and serving 234,000 customers.

Porvair wants to reign in pores. The company makes specialist porous filtration products out of ceramics, plastic, metal, and carbon for a variety of industries, including aerospace, aluminum, high-purity liquids, life sciences, and nuclear maintenance. The company's specialist laboratory filter systems are used by pharmaceutical and drug companies for diagnostic and testing kits, medical devices, and pharmaceutical production. Porvair also makes high performance bi-polar planes for fuel-cell manufacturers. The company operates in both the UK and US.

RainSoft (a division of Aquion Water Treatment Products) wants to clear up the water in your home or office. Through its division, the company makes residential and commercial water treatment equipment. Products include whole-house water conditioning systems, drinking water systems, and filters designed to remove particular contaminants that detract from water's taste and odor. RainSoft's products are distributed through a network of about 300 independent dealers in the US and in 24 countries in Asia, Europe, and the Middle East. Clients have included Allstate , Dow Chemical, Ford Motor, Holiday Inn, and Underwriters Laboratories.

REC Solar helps you say "So long!" to fossil fuel dependence. The company designs and installs solar electric systems for residential and small commercial customers in six states -- Arizona, California, Colorado, Hawaii, New Jersey, and Oregon. REC Solar has installed more than 3,200 power systems since being founded in 1997. Its systems range from simple rooftop panel displays for residential customers to industrial solar electric systems for Costco. REC Solar uses solar panels manufactured by Kyocera, Mitsubishi, Sanyo, and Sharp, and components by Satcon, SMA Solar Technology, and Xantrex. Investment group Mainstream Energy owns both REC Solar and AEE Solar.

ReliOn relies on its ability to produce hydrogen fuel cells in order to make money. The company claims to be the world's leading developer and marketer of modular, cartridge-based, proton exchange membrane fuel cell technology. ReliOn markets a range of stationary fuel cells for emergency and back up power systems, uninterruptible power supplies, digital power needs and a range of off grid power requirements. The company has sold and installed more than 2 MW of products with private and public entities in the energy, telecommunications, and transportation segments. Investors include Avista, Enterprise Partners Venture Capital, and Wall Street Technology Partners.

Renegy Holdings (formerly Catalytica Energy Systems) was formed in the 2007 merger of Catalytica with the renewable energy divisions of NZ Legacy, a land and energy development firm. Among other ventures, Renegy has built a biomass power generation plant near Snowflake, Arizona, that came online in 2008. The company has long-term power purchasing agreements in place with Arizona Public Service and Salt River Project to buy biomass electricity from the Snowflake White Mountain Power plant. To save costs, in 2009 Renegy delisted its stock from the NASDAQ exchange.

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