Electrical and electronic components maker Stoneridge Inc (<a href="https://www.nyse.com/site-search?q=stoneridge&page=1" target="_blank">NYSE:SRI</a>) has signed a deal with a unit of power producer NRG Energy Inc (<a href="https://www.nyse.com/quote/XNYS:NRG" target="_blank">NYSE:NRG</a>) to buy renewable energy certificates (RECs) for its factory in Lexington, Ohio.