Garnet deal. At Port Gregory in the Mid West, Advanced Energy Resources are working on an $11.2 million microgrid to supply GMA Garnet's nearby mine. Arena announced today it would chip in $3 million. The project will include a 2.5MW wind farm, 1MW solar farm and a 2MW/0.5MWh battery. It will provide up to 70 per cent of the mine's power needs.