¥Payback time of energy used in fabrication
–from about 1
year for roof integrated built-in installations in Phoenix made
from high efficiency amorphous Silicon
¥Over
30-year lifetime, Si based solar cells will produce
6 to 31 times the amount of energy used to
produce them
¥No GHG emissions during power generation
¥Energy
generation cost is ~0.18 $/kWh in Arizona (TEP)
¥Monthly use of 500 kWh per house: $90 (TEP
cost ~$40)
¥TEP
anticipates solar cells become cost effective ~2015
¥Solar
cells on the buildings in Tucson would provide the power needed for Tucson transportation via electric cars