Reuters: Private equity firm Blackstone Group LP (BX.N: Quote, Profile, Research) said on Thursday it is creating a new business group to focus on clean energy investments. The group, led by James Kiggen, a former executive at AllianceBernstein, will guide Blackstone’s investment decisions in solar, wind, biofuels and other renewable energy technologies, the company said in a statement. Venture capitalists have invested in the search for clean technologies — from renewable energy to …