Sacramento-based Pacific Ethanol Inc. has laid off 26 employees at an ethanol plant in Nebraska due to low prices and high supply, news agency Reuters reported. Shares of Pacific Ethanol (Nasdaq:PEIX) have fallen 22 percent since the Wednesday morning Reuters report. The stock has fallen 76 percent over the past year. Including other plants, Pacific Ethanol now has put nearly 20 percent of its total U.S.