Earnings Roundup: Making a Profit Proves Tough

A series of companies – including an ethanol producer, an electric-grid-technology developer and a materials provider – release quarterly results showing losses rather than profits.

Making good money in the renewable-energy business can be tough, particularly given the slow economy and the impact of public policies (or lack thereof).

Here is a roundup of the latest earnings posted by greentech companies selling ethanol, low-emission engines, electric-grid equipment and more.