Maximizing solar energy with batteries

solar energy

Maximizing solar energy with batteries

In times like these, when renewable energy must be prioritised, solar energy is the one with the best opportunities of succeeding in the world. Along with its low environmental impact, its economic profitability and the confidence of knowing that it is a renewable energy and, makes it increasingly common to see solar installations, either in photovoltaic stations or particular homes.

Despite all the known benefits, one of the drawbacks was: what happens with all the unconsumed energy? This is being answered by new energy storage projects, such as that of Iberdrola in the Campo Arañuelo Complex.

The company has built the Arañuelo I, II and III plants in the Almaraz region (Cáceres). All of them will be made up of 12,514 fixed structures and 366,180 solar panels. The great innovation of this project is the incorporation of a 3MW storage battery system. Ingeteam is the company hired for its development.This resource manages to capture the unconsumed solar energy and distribute it when it is most needed.

This system maximizes the use of the generated electricity. The extra energy produced by the solar panels is stored when there is less consumption, and it avoids overloads by controlling the energy evacuated.

This project demonstrates, once again, Iberdrola’s commitment to improving clean energy generation systems and the integration of renewable energies in a natural environment. In Campo Arañuelo there are, in total, seven different types of panels with 101,373 modules.

In Spain, as well as Arañuelo III, it is carrying out the Puertollano project (Ciudad Real), currently the first and largest green hydrogen plant in Europe, powered by a 100 MW photovoltaic facility that includes Li-ion batteries with 20 MWh of storage capacity.

On the Elgea-Urkilla (32 MW) wind farm in Álava, Basque Country, the battery has an installed power of 5 MW and 5 MWh of storage capacity and will be the first installed in a wind farm in Spain. There are plans to build another at the ST Abadiano in Biscayne, Basque country, with 6 MW, which will also be built by Ingeteam.

In the Canary Islands, Iberdrola will install batteries on the Ifara and El Vallito wind farms in Granadilla de Abona, Tenerife, with a 12 MW storage system. The company is building or has permission to build 200 MW of battery power, some of which has already been installed, which will increase to 300 MW by 2025, mainly in UK markets and Australia. The company’s current battery storage project portfolio has already reached 900 MW.


Efficient energy storage is a fundamental pillar of the energy transition: allowing flexible renewable energy production and guaranteeing its integration into the grid. Find out which storage systems are the most efficient and which ones promise to drive the much-needed transition towards a decarbonised electricity system.

Electricity can be easily generated, transported and transformed. However, up until now it has not been possible to store it in a practical, easy and cost-effective way. This means that electricity needs to be generated continuously according to demand and, consequently, renewable energies require supporting storage systems for their integration, to avoid drops in clean energy during supply troughs and to provide greater efficiency and security to the electrical grid.

In a world that is in the midst of a transition from fossil fuels to renewable sources, such as wind and solar energy, improved electrical energy storage is vital to support these technologies, ensuring that electrical grids can be balanced and can contribute to the maximisation of every green megawatt generated.

Electricity cannot be stored as such and therefore it needs to be transformed into other types of energy, such as mechanical or chemical. Storage systems can add value at every stage of the supply chain. Depending on their capacity, energy storage systems are divided into: large-scale storage, which is used in places where GW scale is required; storage in the grid and in power generation assets, where the MW scale is used and, finally, storage at the end-user level, which applies to the residential level and works with kW.

Currently, the following list shows the ways to accumulate energy and the main technologies that allow efficient energy transformation and storage:


The most efficient large-scale storage system in operation. This is a cost-effective and proven technology that provides stability to the electrical system and can generate significant levels of clean energy with rapid response times.


These facilities have a reversible motor that, during periods of excess energy, ambient air is stored at high pressures in underground cubicles. It is a mechanical storage system comparable in capacity to hydroelectric pumping.


It consists in accumulating energy in materials that allow it to be retained and released in a controlled manner, through methods ranging from cooling through ice accumulation to exposure to extremely high temperatures.


This is a device capable of storing large amounts of electrical energy in the form of electrostatic charges, meaning there are no chemical reactions. Supercapacitors can be charged or discharged in a matter of seconds, thus being ideal for responding to energy peaks or brief supply interruptions.


This is a mechanical storage system consisting of a metal disc that starts to spin when a torque is applied to it, then, with the action of braking the wheel applying a firm braking torque, electrical energy is conserved in kinetic form.


This is a device that stores energy in chemical compounds capable of generating electrical charge. There are many types, such as lead-acid batteries, lithium ion or nickel cadmium batteries. The main advantages of batteries are their rapid response (milliseconds), their ease of installation and scalability and, finally, the multiple benefits they can bring to renewable assets to which they connect.


This is a type of continuous chemical storage. It differs from batteries in that it is supplied continuously with hydrogen from the outside allowing its constant use. There are other types of fuel cells, but hydrogen is the most commonly-used fuel.


In recent years, the renewable energy sector has seen in lithium-ion batteries the solution to its main problem: the storage of generated energy. Being one of the smallest elements in the periodic table, lithium has a high electrochemical potential and can accumulate large amounts of energy. With the desirable low weight and high efficiency, only one obstacle has so far prevented lithium batteries from becoming the standard storage technology for renewable energy: their high cost.

This situation, however, seems to be changing. According to a recent study by Bloomberg NEF (BNEF), the cost of lithium-ion batteries will be significantly reduced in the coming years — beyond even the 85% reduction that occurred from 2010 to 2018. Specifically, BNEF predicts a 50% reduction in the costs of lithium-ion batteries per kW/h by 2030, as demand takes off in two different markets: stationary storage and electric vehicles.

This will lead to worldwide energy storage facilities multiplying exponentially, from modest 9GW/17GWh implemented from 2018 to 1,095 GW/2,850 GWh by 2040. This dramatic increase will require an estimated investment of US$662 billion.

According to BNEF forecasts, the total demand for batteries in the sectors of stationary storage and electric vehicles will be 4,584 GWh by 2040, which, in addition to supporting the energy transition, will be a great opportunity for battery manufacturers and extraction companies of the components required, such as lithium, cobalt and nickel.

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