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The production of renewable energy in Scotland is an issue that has come to the fore in technical, economic and political terms during the opening years of the 21st century. The natural resource base for renewables is extraordinary by European, and even global standards. In addition to an existing installed capacity of 1.3 gigawatts (GW) of hydro-electric schemes, Scotland has an estimated potential of 36.5 GW of wind and 7.5 GW of tidal power, 25% of the estimated total capacity for the European Union and up to 14 GW of wave power potential, 10% of EU capacity. The renewable electricity generating capacity may be 60 GW or more, considerably greater than the existing capacity from all fuel sources of 10.3 GW. Much of this potential remains untapped, but continuing improvements in engineering are enabling more of the renewable resource to be utilised. Fears regarding 'peak oil' and climate change have driven the subject high up the political agenda and are also encouraging the use of various biofuels. Although the finances of many projects remain either speculative or dependent on subsidies, it is probable that there has been a significant, and in all likelihood long-term, change in the underpinning economics.