Termosolar Borges is a pioneering hybrid concentrated solar power (CSP) and biomass power plant located in Les Borges Blanques, in the province of Lleida, Catalonia, Spain. Commissioned in 2012, it is notable for being one of the world's first commercial-scale power plants to combine solar thermal energy with biomass combustion in a single facility, providing a dispatchable renewable energy source.
Location and Ownership The plant is situated in the municipality of Les Borges Blanques, within Catalonia, Spain, a region with good solar resources and access to agricultural and forest biomass. The project was developed by a consortium involving Elecnor and Aries Ingeniería y Sistemas, and is owned and operated by a joint venture.
Technology and Design Termosolar Borges integrates two distinct renewable energy technologies:
- Concentrated Solar Power (CSP): The solar field consists of parabolic trough collectors. These mirrors concentrate sunlight onto a receiver tube containing a heat transfer fluid (HTF), typically thermal oil. The heated fluid then generates steam in a heat exchanger, which drives a conventional steam turbine to produce electricity. The CSP component has an installed capacity of approximately 22.5 MW.
- Biomass Power Generation: The plant features a biomass boiler that combusts agricultural residues (such as olive pomace and almond shells) and forest waste sourced from the surrounding region. This biomass component contributes an additional 12 MW of electrical capacity.
The hybrid design allows the plant to operate efficiently and consistently. When solar radiation is high, the CSP system is the primary energy source. During periods of low solar radiation, at night, or during cloudy weather, the biomass unit can either supplement the solar thermal input or operate independently to maintain power generation, thus providing a continuous and dispatchable supply of renewable electricity to the grid.
Capacity and Output The plant has a combined gross electrical generation capacity of approximately 34.5 MW (22.5 MW from CSP and 12 MW from biomass). Its hybrid nature significantly enhances its capacity factor compared to a standalone solar thermal plant, ensuring more stable power output and grid reliability.
Significance Termosolar Borges is considered a landmark project in renewable energy for several reasons:
- Hybrid Innovation: It demonstrated the technical and commercial viability of integrating CSP with biomass, offering a model for other dispatchable renewable energy projects.
- Dispatchability: By combining intermittent solar power with a controllable biomass source, the plant effectively overcomes the variability inherent in solar energy, providing reliable power that can respond to grid demands.
- Resource Utilization: It effectively utilizes local renewable resources – both solar irradiance and agricultural/forest waste – contributing to regional economic development and waste management.
- Reduced Emissions: As a renewable energy facility, it significantly reduces greenhouse gas emissions compared to fossil fuel-based power generation.
The success of Termosolar Borges has provided valuable insights into the design, operation, and benefits of hybrid renewable energy systems, influencing future developments in the clean energy sector.