Auckland's Motutapu Island will on Friday flick the switch on the country's largest off-grid solar power system.
Solar panels will generate energy for Department of Conservation homes on the island, the Motuptapu Education Camp and a working farm.
DOC area manager Brett Butland says the system, which has a price tag of $715,000, should save about $190,000 in fuel costs each year.
Mr Butland says that money will be put back into field work on the island.
He says Motutapu is the ninth DOC-managed island to have a renewable energy system installed.
