Sumitomo-backed Alta has officially become the fourth solar product manufacturer to be acquired by Hanergy.

US-based thin film solar module maker Alta Devices conformed last week that it has been acquired by China-based renewable energy company Hanergy Holding Group.

Reports originally emerged last year stating that Hanergy had acquired Alta, one of several thin film solar manufacturers to struggle in the wake of worldwide solar cell prices falling, but Alta formally announced on Wednesday that the deal had closed. The price paid by Hanergy was not disclosed.

Investors in Alta include Presidio Ventures, which acts…