Local companies Clean Tech Mining and Gem Resources have had their operations suspended.
The plant aims to cut mine's carbon emissions by 60,000 tonnes over 10 years.
Partnership targets the revival of mineral exploration in Japan.
Award will extend for two years
Pour marks progress towards commercial production targeted for the first quarter of 2021.
The remote Grasberg mine will be powered via a 100km transmission line.
Canadian mine is refurbishing concentrator
Operation has been on care and maintenance for about nine months.
California operation will be a 'long-life' asset, owner said
Hemlo openpit has been mined since 1989 and has produced over 2.8 million oz gold.
Miner wants to significantly reduce the risk to the mine of any further deterioration in the grid.
Hybrid grid aims to reduce operating costs and carbon emissions.