Installed utility-scale solar project costs have fallen by about 50%, from $6.3 per AC-W to $3.1 per AC-W, since 2009 for solar projects completed in 2014, Lawrence Berkeley National Laboratory said on Sept. 30.

Installed utility-scale solar project costs have fallen by about 50%, from $6.3 per AC-W to $3.1 per AC-W, since 2009 for solar projects completed in 2014, Lawrence Berkeley National Laboratory said on Sept. 30.