How is the 25/30 year savings calculated?

This number is the difference between the “Stay with Electric” and “Switch to Solar” costs found on the “Long Term Savings” Page. 

The “Stay with Electric” portion is calculated by taking the current utility bill total and multiplying it by the utility escalation rate for 25/30 years. This provides you with the average monthly bills for each year. To get the total costs, these averages are then multiplied by 12 to receive the average cost for each year

The “Switch to Solar” portion is calculated by adding the New Utility Bill and Your Solar Payments over 25/30 years. The new utility bill over 25/30 years is calculated the same as the 'Stay with Electric' portion. It is important to note that to get the new utility bill values, the system automatically calculates the escalation rate being applied before the solar system offsets the cost.