At CORVUS PRO SOLAR, our goal is to make this process as transparent and “easy” as possible, a sentiment echoed by many of your neighbors in our 4.9 star Google Reviews.
Your system at a glance
8 panels, 3.68 kW, producing about 4,512 kWh a year.
Your actual roof layout from the design team.
What you pay every month, for 25 years
Orange is Ameren Illinois, climbing 13.5% a year for the first 5 years, then 7% a year after that. Green is your solar payment, locked to 2.99% a year. The gap between them is money you keep.
Your system
Where this lands
Your solar payment is lower than your power bill from month one, and the distance only widens.
Year by year
Your first five years, with all 25 a click away. Ameren Illinois escalated 13.5% a year for the first 5 years, then 7% a year after that, starting from $126 a month. Solar escalated 2.99% annually from $80.12 a month.
| Year | Ameren Illinois | Solar | Saved / mo | Saved / yr | Running total |
|---|---|---|---|---|---|
| 1 | $126 | $80 | $46 | $551 | $551 |
| 2 | $143 | $83 | $61 | $726 | $1,277 |
| 3 | $162 | $85 | $77 | $928 | $2,205 |
| 4 | $184 | $88 | $97 | $1,161 | $3,366 |
| 5 | $209 | $90 | $119 | $1,428 | $4,794 |
| 25 yr | $119,981 | $35,007 | $84,974 | $84,974 |
View all 25 yearsShow less
| Year | Ameren Illinois | Solar | Saved / mo | Saved / yr | Running total |
|---|---|---|---|---|---|
| 6 | $224 | $93 | $131 | $1,571 | $6,365 |
| 7 | $239 | $96 | $144 | $1,726 | $8,091 |
| 8 | $256 | $98 | $158 | $1,893 | $9,984 |
| 9 | $274 | $101 | $173 | $2,073 | $12,056 |
| 10 | $293 | $104 | $189 | $2,266 | $14,323 |
| 11 | $314 | $108 | $206 | $2,475 | $16,798 |
| 12 | $336 | $111 | $225 | $2,700 | $19,499 |
| 13 | $359 | $114 | $245 | $2,943 | $22,442 |
| 14 | $384 | $118 | $267 | $3,204 | $25,645 |
| 15 | $411 | $121 | $290 | $3,484 | $29,130 |
| 16 | $440 | $125 | $316 | $3,787 | $32,916 |
| 17 | $471 | $128 | $343 | $4,112 | $37,028 |
| 18 | $504 | $132 | $372 | $4,461 | $41,489 |
| 19 | $539 | $136 | $403 | $4,837 | $46,326 |
| 20 | $577 | $140 | $437 | $5,241 | $51,568 |
| 21 | $617 | $144 | $473 | $5,676 | $57,243 |
| 22 | $661 | $149 | $512 | $6,142 | $63,386 |
| 23 | $707 | $153 | $554 | $6,644 | $70,030 |
| 24 | $756 | $158 | $599 | $7,183 | $77,212 |
| 25 | $809 | $162 | $647 | $7,761 | $84,974 |
The fine print
- What this compares. Your current average power bill of $126 a month against your solar payment of $80.12 a month, over 25 years. Utility escalated at 13.5% per year for the first 5 years, then 7% per year after that, solar at 2.99% per year.
- Still connected to the grid. You are still connected to the utility grid and would be expected to pay a small fixed monthly rate, considered the standard connection fee.
- Ameren Illinois rates are moving. Ameren Illinois residential rates are up about 94 percent since 2021, from roughly 8 cents a kWh to about 15.5 cents a kWh in 2026. The supply rate rose again on June 1 2026, from 8.769 cents to about 11 cents a kWh, driven by Illinois Commerce Commission approved increases and a sharp rise in regional capacity prices. Past increases do not guarantee future ones.
- This is an estimate, not a contract. Production, rates and savings are projections. Nothing here is a guarantee.