Appaloosa Chief Executive David Tepper had called on TerraForm to "resist" the deal, saying it was a departure from TerraForm's business model and would put shareholders at risk. Appaloosa has also sued SunEdison to try to prevent TerraForm from buying assets from Vivint, which is controlled by Blackstone Group LP. David Einhorn's Green light Capital said in January it was in talks with SunEdison regarding a board seat and that it was pressing for asset sales or even the sale of the company itself. Up to Monday's close, SunEdison's stock had lost 94 percent of its value since the Vivint deal was announced, while Vivint's stock had fallen 52 percent. The cash-and-stock deal, worth $2.2. billion when it was forged last July, had faced criticism from hedge funds