Ohio Public Employees Retirement System, Columbus, might add a portable alpha strategy to its investment mix. J.G. Lee, director of quantitative strategies at the $60 billion fund, said an equity-based portable alpha strategy "is one of many strategies we are discussing," but there is no timeframe for implementation. Portable alpha is attractive because it is a risk-averse way to generate alpha, he said. Neil Toth, director of investments, was traveling and could not return calls for comment. In the past year, the $900 million Cooper Industries pension plan, Houston, and the $1.4 billion San Diego County Employees Retirement Association have added portable alpha strategies to their investment mix.