Electricity demand is increasing every year, to meet the growing electricity demand, new power plants and transmission lines must be built. Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as utilizing wind, solar, and hydro power. In Indonesia renewable energy power generation has grown as a result of clean energy policies. One of the fastest growing of these green energy sources is solar power. One of the main challenges that PLN faces in terms of generating power in insular isolated system is the cost of electricity. This supply mainly comes from diesel generators which use very high price fuel due to difficulty in transportation. In order to overcome this challenge, UPC Renewables propose to develop Hybrid Power Plants in several independent island grid systems. These Hybrid Power Plants consist of PV Farm as its primary energy source and will be equipped with battery for load shifting, frequency regulations, and smoothing functions to ensure safe, reliable, and economic operation of the system. One of the targeted systems is Natuna Island, which geographically is Indonesia’s outermost northern border islands in the Riau Archipelago, Natuna Island located between Singapore, the Malaysian Peninsula on one side and East Malaysia on Borneo on the other.