Ethanol has gradually gain momentum in the world’s energy market in recent decades with Brazil the largest producers. The issue of price linkage among ethanol, sugar and oil is particular interesting and important in the context of Brazilian sugarcane sector. By accounting for the possible structural breaks in the data, we investigate the price linkage of the three commodities and discover that prices are not cointegrated in the first sub-periods but cointegrated in the second sub-period. Also oil price demonstrates weakly exogenous to the prices of the other two commodities; sugar prices appears to drive the ethanol price in the first sub-periods while in the second sub-period, they influence one another.