Statkraft has started the second and final phase of repowering at the Montes de Cierzo wind farm in the Navarrese municipality of Tudela.
The company said it already holds all environmental and administrative licences for the phase, which will run through 2026.
It added that the €40m programme will remove 41 turbines that are 25 years old and replace them with four new machines and a battery storage system.
Statkraft has already replaced 44 turbines with 10 modern units in the earlier phase of the project, according to the company.
It said the full repowered site will be more efficient, produce more clean energy and reduce visual impact by cutting turbine numbers by 84% from 85 to 14.
Installed capacity will rise from 60MW to 90MW and estimated annual output will increase from 145GWh to about 300GWh, the company stated.
Statkraft plans to hybridise the second phase by installing a lithium-ion battery system with 14.26MW of power and 28.51MWh of storage capacity, with a two-hour charge and discharge time.
The company said the system will allow the 25.8MW segment to manage production peaks when the grid is saturated and improve overall efficiency.
It added that storage systems provide flexibility by supplying energy when renewable output is insufficient, helping stabilise supply and reduce price volatility.
The hybridisation project has been selected to receive public aid covering up to 24% of the battery investment under the IDAE’s first call for innovative hybrid storage projects funded through the Recovery, Transformation and Resilience Plan.
Statkraft said storage is a key technology for achieving a fully renewable energy mix and that it is developing further hybrid projects totalling 65MW across solar and wind sites in Galicia, Andalusia, Navarra and Extremadura.
The company also operates the 139.2MW Renovables del Cierzo complex in Navarre, comprising four wind farms commissioned in spring 2024 supplying the equivalent consumption of 123,000 homes and avoiding over 112,000 tonnes of CO2 annually.