Blade cost calculation

Hi all,
I wanted to calculate th blade cost of the NREL 5MW wind turbine in order to calculate the CoE. When I read the WindPACT reports and Wind turbine design cost model (L. Fingersh, M. Hand, and A. Laxson. Wind turbine design cost and scaling model.), I have found the terms GDPE and BCE. Can any one tell me how to calculate these values??