Capstone Turbine Corp. will sell 6.3 million shares of its common stock to two institutional investors, it was announced Tuesday. The Chatsworth company expects to net about $6.8 million from the sale that will go toward general corporate purposes and fund general working capital. The stock offering involves an existing investor and a new accredited investor. They will buy 3.6 million in common shares and receive warrants to purchase 2.7 million shares at the price of $1.20 a share. “We appreciate the support of our investors as we continue to pursue several larger multi-megawatt projects,” Capstone Chief Executive Darren Jamison said in a prepared statement. “Maintaining a strong balance sheet is critical to our business.” Oppenheimer & Co. Inc., in New York, acted as the lead placement agent and Roth Capital Partners, in Newport Beach, acted as co-placement agent. Shares closed up a cent, or just less than 1 percent, to $1.11 on the Nasdaq.