Madrid, Spain [RenewableEnergyAccess.com] ACCIONA Energy and Ente Regional de la Energia de Castilla y Leon (EREN) will build a 15-megawatt (MW) capacity biomass plant in the locality of Briviesca (Burgos province, northern Spain).The plant, the first biomass facility in the region of Castilla y Leon exclusively dedicated to the production of electricity from agricultural waste, will burn around 100,000 tons of straw a year and be operational in October 2009. The Briviesca plant will mean an investment of around Euro 40 million [US$ 54.6 million]. Construction is expected to begin in October this year and the entry into service of the plant is planned for the second half of 2009. It will produce 120 million kilowatt-hours (kWh). Most of the raw material will come from the provinces of Burgos and Palencia, and particularly from the Bureba area, which will benefit from the enhancement in value of this waste organic material. Long-term supply contracts will be signed with farmers, cooperatives and other sector professionals. ACCIONA will own a majority stake in the capital of the project development company. In addition to EREN, it is expected that other regional partners will also become involved. The biomass plant at Briviesca will be the first in the region of Castilla y Leon exclusively dedicated to the production of electricity from agricultural waste products such as straw. ACCIONA Energy has commercially operated a 25 MW capacity straw-fired biomass plant located near the town of Sanguesa (Navarre, northern Spain) for several years. The facility is a benchmark of its type in the south of Europe. Last year the Sanguesa plant produced 204 million kilowatt-hours of electric power.