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Here are the constituents of the WilderHill Clean Energy Index, with a brief description of each company, as of April 1st 2006. The index is the basis for the PowerShares WilderHill Clean Energy Portfolio ETF (NYSEARCA:PBW).

Renewable Energy Harvesting - 27% sector weight (10 stocks @2.7% each)

Distributed Energy, (DESC). Part solar, wind; mainly in DG, some H2: an integrator.
Emcore, (NASDAQ:EMKR). Solar, 27% ultra-efficient PV cells, also makes LED products.
Evergreen (ESLR). Unique string-ribbon solar PV with efficient silicon-use.
Kyocera, (NYSE:KYO). Solar PV, integrated manufacturer is doubling production.
MEMC, (WFR). Producer of the polysilicon needed in many crystalline solar PV cells.
Ormat, (NYSE:ORA). Geothermal, works as well in recovered energy, biofuels.
SunPower, (NASDAQ:SPWR). Solar, Efficient PV panels with all-rear-contact cells.
Cypress, (NASDAQ:CY). (Parent firm of SPWR above, and owns the major block of their stock).
SunTech Power, (NYSE:STP). Solar, fast-growing and major producer of PV is based in China.
Zoltek, (NASDAQ:ZOLT). Wind, makes carbon fiber for wind blades and product ‘lightening’.

Power Delivery and Conservation - 26% sector weight (10 stocks @2.6% each)

American Superconductor, (NASDAQ:AMSC). Superconductors, ‘no’-resistance 2G HTS wire.
American Power Conversion, (OTC:APCC). UPS, makes firm-power systems.
Cree, (NASDAQ:CREE). LEDs, makes efficient lights, power-saving electronics.
Echelon, (NASDAQ:ELON). Networking, for management of whole energy systems.
International Rectifier, (NYSE:IRF). Efficiency-enabling electronics producer.
Itron, (NASDAQ:ITRI). Monitoring, designs energy measurement and management systems.
Magnetek, (NASDAQ:MAG). Makes solar inverters, wind power converters, power controllers.
Power Integration, (NASDAQ:POWI). Energy savings, enables power conservation in IC chips.
SuperPower / Intermagnetics, (IMGC). Superconductors, and power transmission.
UQM Technologies, (NYSEMKT:UQM). Hybrid vehicle electrics; motor & power systems.

Energy Conversion - 18% sector weight (7 stocks @2.57% each)

Ballard Power, (NASDAQ:BLDP). Mid-size fuel cells, makes mainly PEM FCs.
Capstone Turbines, (NASDAQ:CPST). Micro-turbines 30-60 kW, may be flexible-fueled.
FuelCell Energy, (NASDAQ:FCEL). Large fuel cells as stationary high-temp. flex-fuel MCFCs.
Hydrogenics, (NASDAQ:HYGS). Fuel cells and testing gear, H2 electrolysis, regenerative FCs.
Medis, (OTC:MDTL). Micro fuel cells, designed for liquid-fuels and a unique electrolyte.
Mechanical Technology, (OTCQB:MKTY). Small fuel cells, may compete with Li-Ion batteries.
Plug Power, (NASDAQ:PLUG). Mid-sized fuel cells for distributed generation, home power.

Energy Storage - 16% sector weight (6 stocks @2.66% each)

Active Power, (NASDAQ:ACPW). Flywheel power storage, a firm power alternative to batteries.
Energy Conversion Devices, (NASDAQ:ENER). Very diversified: in batteries, solar PV, also H2 FCs.
Impco, (IMCO). Gaseous fuels, a manufacturer and integrator for cleaner-fuel vehicles.
Maxwell, (NASDAQ:MXWL). Ultracapacitors, a battery alternative such as for hybrid vehicles.
Quantum Fuel, (NASDAQ:QTWW). Hydrogen gas storage systems for cleaner-fuel vehicles.
Ultralife Batteries, (NASDAQ:ULBI). Batteries, advanced lithium ion, polymer rechargeable.

Cleaner Fuels - 9% sector weight (5 stocks @1.8% each)

Air Products & Chemicals, (NYSE:APD). Hydrogen, a supplier of many industrial gases.
BOC Group, (NYSE:BOX-OLD). Hydrogen, a supplier of many industrial gases.
MGP, (NASDAQ:MGPI). Biofuels, ethanol and fuel alcohol.
Pacific Ethanol, (NASDAQ:PEIX). Aims to be a leading biofuels producer for Western U.S.
Praxair, (NYSE:PX). Hydrogen, a supplier of many industrial gases.

Greener Utilities - 4% sector weight (2 stocks @2.0% each)

Idacorp, (NYSE:IDA). Hydroelectric, Utility, mainly hydro; also some fuel cell research.
PPM Energy / Scottish Power, (SPI). Wind, Utility, PPM is growing wind power.

Source: PowerShares WilderHill Clean Energy Portfolio home page.

See also: Deconstructing PowerShares’ Clean Energy Portfolio

Source: PowerShares WilderHill Clean Energy ETF Constituents