Endesa has commissioned the first three electricity storage facilities connected to Spain’s power grid at its generation plants in the Canary Islands.

These form part of Project STORE, a European storage project with the primary objective to demonstrate the technical and economic feasibility of large scale energy storage systems in island environments.

Endesa aims to demonstrate through Project STORE that three different energy storage technologies – lithium-ion batteries, ultra-condensors, and flywheels – can be efficiently integrated in a real world environment into isolated power systems, as is the case of island systems.

The project also encourages the full integration of renewable energies, since electricity storage will boost the operating capacity of these energies to 24 hours a day, irrespective of the specific demands of the system.

The €11 million project, which Endesa is leading, also includes Telvent, Isotrol and Ingeteam as industrial partners, and several research centers, including Spain’s Center for the Development of Industrial Technology (CDTI).

The three facilities installed in the Canaries will each develop one of the three storage technologies.

The facility in the town of La Aldea de San Nicolás on Gran Canaria will use electrochemical storage in the form of 1MW/3MWh Li-ion batteries. It will be used to test the actual capabilities to offer ancillary services in the same way as a conventional generation unit, to manage demand, provide inertia and active power to the system, regulate voltage and play a role in secondary voltage regulation.

The facility installed in the town of Alajeró on La Gomera uses a 0.5MW/18MWs flywheel system. It will provide inertia and active power for primary voltage regulation, as well as helping to continuously stabilize voltage on the island.

At the facility at Breña Alta on La Palma, 4MW/20MWs ultra-condensors will stabilize system voltage, and verify this technology’s ability to avoid outages due to unforeseen faults, reinforcing the system and improving the quality of supply.

The flywheel and ultra-condensor storage systems have very fast response times, which means they are perfect for avoiding unexpected events that can lead to partial power failures in small electricity systems or even widespread outages.

The facility on Gran Canaria, meanwhile, has greater storage capacity and can operate as a manageable generation group, with loading and unloading programmed daily.