Recent sub $25/MWh PPA agreements on large solar projects throughout the US are causing changes in the financial models for investment groups.
First shorter term PPAs are becoming more standard for 10 years or less. In this first period it is becoming assumed that little or no return can be obtained.
Then a larger PPA rate for the remaining greater than 20 years is assumed where the majority of the profit is obtained.
Reduced maintenance costs and reduced replacement/repair costs are also being assumed to make these deals attractive for the investor community.