It's been a busy summer for me and my Ten Clean Energy Stocks for 2013 model portfolio. While I delayed my monthly update, the companies in the model portfolio have been very busy reporting (and restating) earnings. Overall, the portfolio was flat for July and August, with 1.2 percent of dividends offsetting a 1.1 percent decline in stock prices. This put it further behind my benchmarks, the iShares Russell 2000 Index (IWM) for the broad market, and the Powershares Wilderhill Clean Energy Index (PBW) for clean energy stocks. These each notched up 2 percent over the last two months. For the year to August 30th, my model portfolio is up 10.6 percent, compared to 22.5 percent and 37.9 percent for IWM and PBW, respectively.