Index profile

WilderHill Clean Energy Index

Index family


The Wilderhill Clean Energy Index includes only those companies focusing on the technologies for utilizing greener, renewable sources of energy. These technologies include renewable energy harvesting or production, energy conversion, energy storage, pollution prevention, improving efficiency, power delivery, energy conservation, and monitoring information. There is a strong bias in favour of the pure-play companies in wind power, solar power, hydrogen and fuel cells, bio fuels, and related fields; companies in relevant fields such as hydroelectric, geothermal, wave, tidal, waste heat recapture and others will be considered with respect to carbon content, the impacts upon marine and terrestrial biodiversity, and degree to which they advance or reflect the clean energy sector. In the selection process both ecological and economic aspects are relevant.

Excluding criteria

Nuclear power is not allowed in ECO.

Positive criteria

(1) The Clean Energy Index uses modified equal dollar weighting. No single stock may exceed 4% of the total Clean Energy Index weight at the start of quarterly rebalancing.

(2) For a stock to be included in the selection universe, the company must be identified as one that has a significant exposure to clean energy, or contribute to the advancement of clean energy, or be important to the development of clean energy.
• Companies in the Clean Energy Index generally (i) work to further renewable energy efforts and do so in ecologically and economically sensible ways; or (ii) help prevent pollutants, such as CO2, NOx, SOx or particulates-avoiding carbon or contaminants that harm oceans, land, air, or ecosystems structure; or (iii) de facto incorporate ideals of the precautionary principle or pollution prevention into their energy efforts.
• Companies in the Clean Energy Index generally will not have their majority interests in the highest-carbon fuels: oil or coal.
• Large companies with interests outside clean energy may be included if they are significant to this sector.

(3) Market capitalization for a majority of Clean Energy Index stocks is typically $200 million and above. To account for notable but smaller companies sometimes significant to the clean energy field, a minority of Clean Energy Index stocks may have market capitalizations between $50 million and $200 million.

(4) Stocks in the Clean Energy Index generally as a guideline should:
I. have three-month average market capitalization of at least $50 million;
II. have a three-month average closing price above $1.00;
III. be listed on a major U.S. exchange such as the NYSE, AMEX or NASDAQ and if a foreign company have their ADR listed on one of these exchanges;
IV. reach minimum average daily liquidity requirements for sufficient trade volume.

Research done by

WilderShares, LLC

Funds based on the index PowerShares WilderHill Clean Energy Portfolio
Finance-/tech. - support by WilderShares, LLC
Benchmark n.s.
Company profiles n.s.


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