Rarotonga is the largest island in the Cook Islands and the centre for international tourism. Historically, all electricity generation on the island has come from diesel generators managed by Te Aponga Uira (TAU), Rarotonga’s power company. Over the last decade, there has been a steady increase in the number of solar photovoltaic (PV) installations in Rarotonga, which has increased the island’s renewable electricity generation to about 8% of total generation.
In 2020 , Vector Powersmart installed and completed a 2MW/10.5 MWh utility scale battery to provide dynamic power capacity to the network to mitigate fluctuations from solar PV generation. The battery also helps maintain electricity frequency on the network within the target range and provides voltage support.
TAU now has the capacity to increase its renewable generation on the network as Rarotonga looks to further reduce its reliance on imported fossil fuels.