AMSC, a Devens company that makes products for wind turbines and energy grids, reported a second-quarter loss of $15.9 million, or 31 cents per share, compared with net loss of $51.7 million, or $1.02 per share, in the year-ago period.
Second-quarter revenues of $20.9 million were roughly flat with those of the same quarter a year ago.
AMSC, which is also known as American Superconductor, is embroiled in a lawsuit with Sinovel Wind Group, a Chinese wind turbine maker that was once AMSC’s largest customer. AMSC alleges Sinovel stole its intellectual property. Sinovel once accounted for nearly 80 percent of AMSC’s revenues.
Shares of AMSC closed up 13 cents at $3.80.