--Latest news: granted licences to develop two major wind farms off Scotland in league with Scottish and Southern Energy and RWE npower

Renewable Energy Generation

--Market cap: £40 million

--What do they do? Developing and operating onshore wind farms

--Where have the shares been? Touched a record high of 132p last year, having floated in spring 2005 at 100p. Over the last year, however, the stock has crashed to trade at 38p

--Latest news: selling its Canadian division to focus on its seven UK wind farms. No sign of the takeover that excited the shares last year

Ocean Power Technologies

--Market cap: £40 million

--What do they do? Develop and manufacture wave energy buoys

--Where have the shares been? Floated in late 2003 at the equivalent of 1250p and went to an initial premium. The stock has ebbed away ever since to trade close to an all-time low at 362p

--Latest news: says its power buoys are ready for deployment off the Orkneys in what will effectively be a giant marine energy laboratory

Helius Energy

--Market cap: £25 million

--What do they do? Developing biomass energy plants

--Where have the shares been? Floated at 26p in early 2007, it was at a high of 62p by the end of that year. After a dive last year to a low of 16p, a recent rally in the stock has taken it back to 27p

--Latest news: reported that it moved into the black at the half year and that a pipeline of three sizeable renewables power stations are on schedule

Renewable Energy Holdings

--Market cap: £20 million

--What do they do? Operates wind farms in Europe and involved in wave and solar energy

--Where have the shares been? Debuted at 50p in February 2005 and touched a high of 75p soon after. By this time last year they were back at the float price and have since fallen by around a third to 32p

--Latest news: has warned of poor wind strength at its German wind farms; has sold wave energy interests and aiming to get into Sicilian solar power

Romag Holdings

--Market cap: £20 million

--What do they do? Manufacturer of solar panels

--Where have the shares been? Shares 18 months ago were at a 270p peak, a sixfold rise on their 45p debut in late 2003. Since then, the price has shattered trading close to an all-time low at 36p

--Latest news: warned demand for solar panels has dived: revenues have dropped, losses have widened and the dividend has been axed

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