Two of last year's respondents, Sovello Solar of Germany and Scheuten Solar, owned by China but based in the Netherlands, went out of business in 2012. A third, Suntech Power, the Chinese firm that was once the world's largest maker of PV solar modules and a leader in sustainability initiatives, is in the midst of bankruptcy proceedings. These companies are among only a handful of industry players who have responded to the coalition's survey in the past.