If you told them in 1975 that they'd be one of the biggest companies in the world in 2015 if they didn't change much, the smart play would have been to continue

If you told them in 1975 that they'd be one of the biggest companies in the world in 2015 if they didn't change much, the smart play would have been to continue on the same path, not dive in to renewables. What are the renewable energy focused companies in 2015 that are doing any revenue (let alone profit) that in any way matches what Exxon is doing today?