FuelCell Energy (NASDAQ: FCEL) was down by 14.4%, and Workhorse Group (NASDAQ: WKHS) dropped 16.1%. According to data provided by S&P Global Market Intelligence, shares of industrial electric vehicle company Proterra (NASDAQ: PTRA) were off by 20.3% as of 11:20 a.m. Friday morning since the close of trading last week. Federal Reserve officials spoke in multiple places this week about their plans to continue to raise interest rates over the next year in order to fight inflation and cool off the economy, and investors were weighing how that would impact various types of businesses.