Question: how much electricity does roof heat cable use?
Answer: A typical 120 foot long roof edge with 6-12" overhangs and no gutters deicing, will need about 291 feet of cable. That equals to 2.3kWh per hour or almost 56kWh per day of continuous operation. With US average electric price of $0.13/kWh, you will be spending $7.25 per day, if your system is running full 24 hours.