That is 54% more solar capacity than would be added if the ITC were allowed to drop from 30% to 10%, as currently planned, and would result in $40bn in incremental investment, GTM Research says.
The US added 6.4GW of solar capacity in 2014, and was the world's third largest market, trailing China and Japan.
The impact of an ITC extension would be most pronounced in the utility-scale sector, where project economics are tightest, giving a huge boost to players like First Solar and SunPower.
Deployments