The Technology Descriptions of the 2009 Technology Map assess the technological state of the art and anticipated developments of 17 energy technologies, the status of the corresponding industries and their potential, the barriers to large scale deployment, the needs of the industrial sector to realise the technology goals and the synergies with other sectors. The technologies addressed are: wind power, solar photovoltaics, concentrated solar power, hydropower, geothermal energy, ocean energy, cogeneration of heat and power, carbon capture and storage, advanced fossil fuel power generation, nuclear fission, nuclear fusion, electricity grids, bioenergy for power generation, biofuels for transport applications, fuel cell and hydrogen technologies, electricity storage and energy efficiency in transport. The 2009 Technology Map is the SET-Plan reference on the state of knowledge for low carbon technology in Europe, presenting a snapshot of the energy technology market situation for 2008-2009. However, the information in this work should be seen in the context of the dynamics of the energy technology market. As such, SETIS is continuously tracking and monitoring the global development and progress of energy technologies and makes this information available "on-line" in the SETIS website: http://setis.ec.europa.eu.JRC.DG.F.7-Energy systems evaluatio