David Tepper-led hedge fund Appaloosa Managemen sued to prevent SunEdison’s yieldco from taking over some of Vivint Solar’s assets after SunEdison acquires the rooftop panel installer.

The yieldco, TerraForm Power, is to acquire Vivint’s residential solar rooftop portfolio after SunEdison completes the Vivint transaction.

Appaloosa is seeking “immediate injunctive relief”, given that SunEdison’s acquisition of Vivint could close “at any time,” the hedge fund said in a filing in a Delaware court on Tuesday.

Tepper goes after TerraForm Power, SunEdisonSunEdison shares fell about 10 percent in morning trading, while TerraForm Power’s shares rose about 2 percent.

Appaloosa has repeatedly said the acquisition of Vivint’s assets by TerraForm Power was not in the interest of the yieldco’s shareholders.Funds affiliated with Appaloosa together owned 9.5 percent of the outstanding class A shares of TerraForm Power as of December.

Source: Appaloosa sues to block SunEdison unit from buying Vivint assets