¥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