SYNOPSIS The UK electricity market is being opened up to full competition in stages, starting in September 1998. This radical change means that consumers can contract with suppliers of their choice, rather than just with their local Regional Electricity Companies. It also makes it possible for purveyors of renewable energy to offer “green” power from renewable energy sources direct to consumers, although they are likely, at least initially, to have to be charged a premium price. While some hope that this new green power market will expand so that renewable energy technology can begin to make a significant contribution to the UK's electricity supplies, there are several problems with this new scheme, not least the fact that it relies of the voluntary support of altruistic consumers. Can they be relied on to provide sufficient surplus to fund the expansion of renewables? Shouldn't this be the responsibility of the government? Or the energy companies? Some renewable energy proponents even fear that, since liberalisation may drive down the price of conventional electricity, renewables will be left looking expensive, and, far from expanding, could be wiped out entirely. This paper explores the potential and limits of the green market approach to renewable energy development, and looks at some of the alternative, or complementary, approaches that might be used to help stimulate the development and use of renewable energy technologies. In this paper the term “liberalisation” is used to mean giving consumers the opportunity to buy electricity from whom they please by removing restraints on competition. In the US the term “deregulation” is sometimes used. However, liberalisation is not necessarily synonymous with abandoning regulation. Nevertheless, there is clearly a debate over how much freedom should be given to the market, and how much regulation should be relaxed.