This research paper has the main objective to study in Smelter Mining In Indonesia. Energy contributed more than 30 Percent of total cash cost production Smelter. Due To This Condition, Smelter Plant must be controlling budget power plant to reduce cash cost production of plant. Existing Power Plant PT Antam, Tbk consumed Fuel Oil as fuel to produce Electricity. In order to get efficiency and then excellence Operation must be analysis the other option for fuel to produce electricity. Case Study research is conducted by reviewing secondary data from PT Antam, Tbk. This case to implementing diversification strategies of David’s Alternatives Strategies and Strategy Formulation. The Expectation gives positive Impacts on the financial and operation to the PT Antam,Tbk.

Keywords
Smelter, Power Plant, Operational Effectiveness, Diversification, Green House.