Solar and wind make up 2-3% of energy produced in the US. We can still make huge improvements just doubling a few times to bring it to 33% before talking about

Solar and wind make up 2-3% of energy produced in the US. We can still make huge improvements just doubling a few times to bring it to 33% before talking about a 100% renewable grid. (Though some people have said that a 100% renewable grid is still achievable within reasonable economic conditions.)