This is my weekly recap of the NEX index, the WilderHill Global New Energy Innovation Index. The NEX is tracked by the PowerShares Global Clean Energy Fund (PBD: 9.70 0.00 0.00%). The results posted here are for the week that ended last Friday (May 16).

The NEX had a pretty spiffy week, gaining 6.3%, compared with the S&P 500, up 1.6% and the NASDAQ, up 1.1%. Digging up my posts for the past weeks since the recent low in mid March, the index is up 20.7% since those lows. In the different sectors, solar let the way up 7.9% with wind power close behind at a positive 7.5%. Of the seven sectors, only one was in negative territory, with hydrogen and fuel cells sliding 1.2%.

Here are the top and bottom stocks from the index for the week:

NEX top gainers since 13/05/08
Aventine Renewable Energy Holdings AVR + 37.5%
Zoltek ZOLT + 24.4%
Gushan Environmental Energy GU + 22.8%
Hansen Transmission HSN + 22.2%
Novozymes A/S Series B NZYM’B + 22.0%

NEX top losers since 13/05/08
Verenium VRNM - 8.9%

Medis Technologies MDTL - 7.1%
EnviTec Biogas ETG - 6.7%
Zhejiang Yankon Group 600261 - 6.2%
Centrotec Sustainable CEV - 6.1%

Note: I currently do not have a position in any security listed.