The Indian government has accused San Jose-based SunPower and several other solar panel makers of dumping their products onto the domestic market.
According to a document obtained by Bloomberg News, India has found U.S., Chinese, Taiwanese and Malaysian solar-equipment makers were involved.
The dumping caused "material injury" to domestic manufacturers Indosola, Websol Energy System and Jupiter Solar Power, according to a document dated Tuesday and signed by D.P. Mohapatra, a director in India's Ministry of Commerce & Industry. Mohapatra didn't respond to emails or phone calls seeking comment.
The ministry estimated that more than 20 companies sold equipment in India at as little as less than half the regular price in their home markets, according to the document. Parties involved have until Friday to respond to the ministry's findings, according to the document.
Four people involved in the antidumping probe, including manufacturers alleging dumping and developers opposed to duties, confirmed the document's authenticity. Commerce Secretary Rajeev Kher didn't respond to an email, text message or calls to his mobile phone. Commerce Ministry spokesman Dhiraj Singh said he wasn't authorized to speak on the matter.
"We disagree that we have dumped imports into the Indian market," Steve Krum, a spokesman for First Solar, the largest U.S. panel-maker, said in an emailed statement. "The preliminary decision by the Indian authorities, if upheld, would make serving the Indian market very difficult."
SunPower, the second-biggest U.S. panel producer, said its focus in Asia is in Japan, China and the Middle East, and Ingrid Ekstrom, a spokeswoman, declined to address Indian trade issues. Canadian Solar, the best-performing solar manufacturer in the past year, didn't respond to inquiries.
India started the antidumping investigation in November 2012. The Commerce Ministry faces a May 22 deadline to decide whether to recommend the imposition of duties on imports.