The Aste 1B Concentrating Solar Power – Thermal Energy Storage System is a 50,000kW energy storage project located in Ciudad Real, Alcazar de San Juan, Spain.

The thermal energy storage project uses molten salt as its storage technology. The project was commissioned in 2012.


The Aste 1B Concentrating Solar Power – Thermal Energy Storage System was developed by Aries Ingenieria Y Sistemas and Elecnor. The project is owned by Aries Ingenieria Y Sistemas (50%) and Elecnor (50%), a subsidiary of Cantiles XXI.

The key application of the project is renewables capacity firming, renewables energy time shift.

Contractors involved

Aries Ingenieria Y Sistemas and Elecnor have delivered the project.

Additional information

Electricity generation of the plant is 170,000 MWh/yr (Expected/Planned). The type of storage is 2-tank indirect and the description is as follows: 60% Sodium Nitrate, 40% Potassium Nitrate.

About Aries Ingenieria Y Sistemas

Aries Ingenieria Y Sistemas SA (Aries), a subsidiary of AF AB, is a diversified company that offers engineering services. The company provides planning, construction, turn-key projects, testing laboratories, supply chain management, purchase management, servo hydraulics, electro-mechanical design, software design, control system and instrumentation services, among others. It offers activities such as basic and detail engineering, construction, start-up, operation of projects, and others. Aries provides engineering services such as studies and economic consulting, plant engineering, basic and detailed engineering, plant management and systems integration, among others. The company caters energy, power, construction, test system, instrumentation and measurement, industrial, security and defense sectors, among others. It operates through its offices in Spain, the US and China. Aries is headquartered in Madrid, Spain.

About Elecnor

Elecnor SA (Elecnor) is an engineering and construction company that involves into engineering, development and construction of projects relating to infrastructure, renewable energies and new technologies. The company focuses on end-to-end management of electricity, power generation, telecommunications and systems, facilities, gas, construction, maintenance, environment and water, rail and space projects. It also invests in power generation and transmission assets, primarily in the wind power and solar thermal segments, and also provides environmental services. The company has operational presence in Germany, Portugal, Mexico, Australia, Canada, the UAE, Chile, the UK and the US. Elecnor is headquartered in Madrid, Spain.


All publicly-announced energy storage projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects are sourced through secondary information sources such as country specific power players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.