American Electric Power Company Inc (<a href="https://www.nasdaq.com/market-activity/stocks/aep" target="_blank">NASDAQ:AEP</a>) and PNM Resources (<a href="https://www.nyse.com/quote/XNYS:PNM" target="_blank">NYSE:PNM</a>) on Tuesday announced an agreement to sell their 50% stakes in a New Mexico-based joint venture that holds solar assets with a total potential capacity of 625 MW.