PV-battery systems for increasing the share of renewable energy and avoiding repowering lines in islands where grid-parity is reached

PV grid parity has been reached in the Gran Canaria island grid. To diminish the generating cost ($ 297.37/MWh on average in Canary Islands in 2013) the new Spanish regulation approved in August 2014 offer substantial incentives for PV investment in insular systems. However, many of the best locations for large PV systems are far away from substations. On the other hand, there are isolated villages at the end of large power lines, where the energy demand is increasing and a combination of PV and storage systems could avoid a costly repowering of the grid. In this work we analyze how capacity combinations of PV systems and Li-ion batteries (405 kWp PV and 1MW/3MWh Li-ion batteries currently located) in a defined area can increase the share of PV energy in the power system and also could transfer capital from costly grid repowering investment to new PV-battery systems.