To this end, the control and supervision work carried out by the Control Centre of Renewable Energy (CECRE) is essential. But it is also necessary to develop and undertake projects aimed at energy storage, conceived as system operation tools that will help optimise the efficiency of the system.
In the peninsular electricity system, the production of energy from renewable sources represented 33.8% with respect to the total energy production generated. In line with previous years, noteworthy is the important contribution of wind generation, whose contribution to total energy production reached 19.3%, this ranks wind in second place, behind nuclear energy.
The energy transferred from the Spanish Peninsula covered 19.6% of the Balearic Islands demand, reaching peaks that exceeded 35% of hourly consumption, which has meant a saving of 29% in demand coverage costs of the Balearic Islands system and has avoided the emission of approximately 350,000 tonnes of CO2eq in the territory of the Balearic Islands.
In the Canary Islands, generation of renewable origin has represented 7.9% of the total generation, reaching levels of 34% in Gran Canaria and 35% in La Palma, particularly challenging values in small isolated electricity systems.
The Gorona del Viento hydro-wind power station has been in regular operation throughout 2017, therefore increasing the integration of renewable energy into the electricity system of the island of El Hierro. In this regard, in the month of July, the monthly integration of renewable energy into this system reached almost 80%, achieving 46.5% for the whole year.
The construction of the hydro-electric pumped storage power station between the reservoirs of Soria and Chira represents an essential tool to advance towards the sustainability of the new energy model in the Canary Islands, as it will enable greater development and increased use of renewable energy on the island of Gran Canaria. This facility will be a key element to reduce the vulnerability of the system, when faced with demand peaks, or certain situations of lack of generation associated with smaller and electrically isolated systems, such as that of the island of Gran Canaria.
The Almacena project consists of the field installation and subsequent operation of an energy storage system, specifically a prismatic lithium-ion battery. The project aims to evaluate the technical capabilities and characteristics that this type of facility currently offers as a tool that could help improve efficiency in the operation of electricity systems. In 2014, the energy storage system was installed in the Carmona Substation (Seville) and during this period it has been going through a trial phase in which its functionalities, aimed at facilitating the integration of renewables and the improvement of the system operation services, have been tested.