Installed by infrastructure company Vector, the new solar power systems cost $500,000 and provide electricity for DOC bases at Port Fitzroy and Okiwi. Power at the two sites, where 11 DOC staff are based, had been provided by four diesel generators.
The new solar power systems have been installed as part of DOC’s sustainability programme. This aims to halve DOC’s use of diesel to generate power – at places like Great Barrier Island that are not on the national electricity grid – by converting to renewable energy systems such as solar power.
“The Great Barrier project is one of the largest off-grid solar power installations in the country,” says Tim Brandenburg, DOC’s Warkworth and Great Barrier Island area manager.
“The 138 solar panels are expected to generate at least 37,000kWh per year, and to provide up to 80% of the power needed to run DOC’s two bases.”
The system is expected to reduce DOC’s diesel consumption on the island by up to 80%, and will save the department about $45,000 a year. In addition, the lower maintenance required on the new diesel back-up generators – two of the old Lister generators had clocked up an impressive 125,000 hours each – will free up staff to work on other conservation priorities.
An added benefit of the new systems is how quietly they run in comparison to the generators.
“Visitors to DOC’s campground at Akapoua Bay are enjoying the peace and quiet now that the old diesel generators at the DOC workshops have been switched off,” says Mr Brandenburg.
DOC staff living in houses at Okiwi station are not only celebrating the demise of the noisy generators, but also the improved supply of electricity the solar system provides.
“With the diesel generators, the system would fall over if they all ran their vacuum cleaners and washing machines at the same time. They even avoided everyday appliances such as toasters and jugs to conserve electricity. Now the supply is much better and our staff can join the 21st century,” says Mr Brandenburg.
Vector chief executive officer Simon Mackenzie says his company welcomes the opportunity to work with DOC to develop a sustainable solar solution to meet its power needs on Great Barrier Island.
“We’re pleased to be providing solar systems that will provide cheaper, cleaner and quieter power for DOC at a location that is quite remote,” says Simon Mackenzie.
Along with the solar panels, the new power systems at Port Fitzroy and Okiwi include new battery banks and inverters providing a much more stable power supply. New diesel generators, which are more efficient than the old generators, have been installed to provide backup power. There are also new switchboards, cabling and other infrastructure including a new generator shed at Okiwi.
Great Barrier joins Motutapu, Tiritiri Matangi, Motuihe and Hauturu / Little Barrier as the fifth island in the Hauraki Gulf Marine Park where DOC has built a solar power system to replace diesel generation. Motuora Island’s solar power system was funded by the Motuora Restoration Society.
DOC has also installed solar power on Stewart(Rakiura), Chatham, Maud, Kapiti and Mana islands. The island conversions from diesel generation are producing significant savings for the Department.
Vector has begun work on a 44 kW (p) solar power project on the remote DOC-managed Raoul Island in the Kermadec Group. The $600,000 project should be completed in May, and is expected to generate savings of $81,000 per year.