Nasdaq listed GPRE closed up 5.80% today at 36.50.

The company, which is based in Las Vegas, is building a 50 million gallon ethanol plant in Iowa.

Bioenergy watchers might also be interested to trawl through their detailed links page on agricultural data, particularly on corn and ethanol.

D1 Oils PLC , gaining over 8% on the day to close at 227.75p

It could be that the market is responding positively to news that it is on course to deliver 72,000 tonnes of biodiesel by year-end. Today it was also anticipated that dealings would commence on a 100,000 plus share allotment.

Perhaps the company's renowned volatility will soon start to settle down with more predicatable cash flows like these coming on stream. It has however, been a rollercoaster ride since going public in late 2004, with a high of over 500 and a low of around 150.

That's why this is certainly one company to watch closely.