No jargon, just the number that matters: how much solar takes off your electricity bill, this month and over the life of the system.
"Bill without solar" grows every year with your rate-increase assumption; "with solar" is just the unoffset portion of that same growing bill.
Further reading: Net Metering vs. Net Billing: How Solar Export Credits Actually Work
The single biggest reason online savings estimates disagree is whether they account for rising electricity prices. A flat "$1,620/year × 20 years" estimate undercounts real savings, because the value of every kWh you generate grows as utility rates rise. This calculator compounds that growth year by year instead.
Unless your offset is set to 100%+, some usage still draws from the grid — cloudy days, winter months, and any usage above what your system produces. Raise the offset % to see the effect of a larger system.
This tool only answers "how much will I save" — it skips system cost and payback. Use the Solar ROI Calculator once you have a quote and want the full payback and return picture.