Japan is assisting Pacific Island countries with efforts to upgrade power systems in a bid to ensure reliable supply.
While huge strides are being made to provide renewable energy sources, diesel generation needs to be maintained to ensure there is electricity around the clock and all year long.
Our Marshall Islands correspondent, Giff Johnson, says Japan's so-called Hybrid Islands initiative takes into account weather fluctuations.
"The goal of this is is to increase renewables to the greatest degree possible while optimising existing traditional style fossil-fuel power plants."
Giff Johnson says the power scheme is part of a seven areas of Japanese development assistance to the region, worth almost half a billion US dollars over three years.