Yes, the full lifecycle of the construction, transport, installation, and use of technologies (windmills, biofuels, solar, etc.) can be taken into account. In the best assessments, this is done.
The state of California, for example, has adopted a 'Carbon Calculator' that my research group developed. We built a first version that is online at http://bie.berkeley.edu/calculator.html and a California-specific version on the state supported website http://www.coolcalifornia.org.
This calculator includes goods and services, energy, and vehicle purchases. Later commercial-sector versions will show the greenhouse gas inputs to energy systems, including wind, natural gas, coal, and a range of other technologies.
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