You've probably heard it from neighbors or a door-to-door salesperson: solar saves money. The real story, though, is in the details, cost versus benefit, payback periods, and the factors most people never see in a quick quote.

So how do you calculate a realistic return on your solar investment when so many variables are in play?

We had the same question. Most "solar payback calculators" online are too simplistic and miss Alberta's unique regulatory environment, including seasonal rate plans that micro-generators can switch between throughout the year.

Our Solar Payback Calculator is built specifically for Alberta. It accounts for seasonal rate strategies, shows cumulative savings and ROI over time, and gives you an annualized return figure so you can compare solar against other investments like a high-interest savings account or mutual fund.

The goal is accuracy without complexity. One can think of a kWh of solar-generated power as having the same value to the homeowner, whether it was exported to the grid (resulting in a credit on your bill at your current rate per kWh) or self-consumed by your home (saving you the equivalent kWh of power you would otherwise have had to import from the grid). Our calculator uses this principle to build an accurate picture of your solar system's true value while factoring in any additional costs that come with installing a system.

What each input means

• System Cost ($): Total installed cost of your solar system (panels, inverter, permits, install, and related costs). This is the investment amount the calculator compares savings against.
• Low Season Production (kWh): Total production during Alberta's lower-output months (typically Oct-Mar). This is usually easiest to source from your inverter app or installer estimate.
• High Season Production (kWh): Total production during Alberta's higher-output months (typically Apr-Sep). This can also come from your inverter app or installer estimate.
• Low Rate (cents/kWh): One of two rates available through a solar rate plan (such as Solar Club). This value is applied to low-season production and is usually your lower import/export period.
• High Rate (cents/kWh): The second rate available through a solar rate plan (such as Solar Club). This value is applied to high-season production and is often the higher-value export period.
• Annual Increase in Electricity Price (%): Assumed yearly escalation in electricity prices. Higher values increase projected long-term savings.
• Financing Interest Rate (%): Loan rate used if the system is financed instead of cash-paid. The calculator subtracts annual loan payments from savings using a 25-year amortization.
• D&T Service Area (optional): Used to estimate variable distribution/transmission savings from self-consumed solar. Select your wires owner area (EPCOR, ENMAX/ATCO, FortisAlberta, ATCO, or Custom). D&T amounts vary by wires provider.
• Self-Consumed Solar (%): Estimated share of your production used in your home instead of exported. This directly drives how much variable D&T savings are included. For typical homes sized near 100% annual usage, this is often around 30%.

Your Results

Once the values are finalized, the calculator displays a "Your Results" summary in the right-hand pane with three key values:

• Payback Period: How many years it takes for cumulative savings to recover your upfront system cost.
• Average ROI per Year: Your annualized return percentage, expressed as a percentage of system cost, spread evenly across 25 years.
• ROI over Lifetime: Total net dollar return over the full 25-year period (total savings minus system cost, and minus financing effects if financing is used).

Cumulative Savings Chart

Lastly, the Cumulative Savings Chart shows you graphically how the annual value produced by your solar system contributes to paying back your initial investment, along with your cumulative ROI over the system lifetime.

• Green bars: Running total of net annual savings (hover a bar for gross savings, financing payment, and components).
• Red dashed line: Your system cost (cash payback occurs when bars cross above it).
• Blue line: Cumulative ROI in dollars (cumulative savings minus system cost; matches ROI over Lifetime).