Last week at the Windpower 2018 conference and expo, ACCIONA Energia received the first independent certification for its hybrid wind power and energy storage plant by DNV GL, an energy certification body. The plant is located at Barásoain in Navarra, northern Spain.
The Barásoain plant’s storage system consists of two batteries located in separate containers: one fast-response battery of 1 MW/0.39 MWh (capable of maintaining 1 MW of power for 20 minutes) and another slower-response battery with greater autonomy (0.7 MW/0.7 MWh, maintaining 0.7 MW for 1 hour).
Both have Samsung SDI Li-ion technology connected to a 3-MW AW116/300 wind turbine of ACCIONA Windpower (Nordex Group) technology, from which they capture and store the energy. There are five turbines at the experimental wind farm at Barásoain, operated by the company since 2013. The entire system is managed by control software developed in-house by ACCIONA and is monitored in real time by the company’s Renewable Energies Control Center (CECOER).
The grid-scale storage system serves many purposes for the Spanish grid.
“It helps you to balance the grid, or store the energy at times at which the market doesn’t pay off the generation from the wind turbine,” said Carlos Albero, Global Finance Segmant Leader with DNV GL. With Europe’s market-based energy mechanisms, at certain times, the price available for energy is too low, explained Albero.
“So the way to use storage to mitigate merchant risk is great. You can store the energy, wait for moments in which the market pays higher prices and then put your energy into the market,” he said.
Grid-scale storage is an emerging asset class and Albero hopes the certification will give investors confidence in the solution.
“From a lending perspective, you can trust that the project is going to perform and is installed within the best market practices,” he said.
“We hope that this establishes a milestone for the whole sector to move together and convince lenders and investors through this second party verification.”