Calculator Inputs
Projection term: 25 yearsSunk Cost Analysis
Enter your current bill and move-in year to see how much you've already paid to the utility.
Your current monthly electricity bill
When you first started paying utilities at this home
Utility Details
Adjust to match your local utility trends
Enter if your utility charges a fixed monthly fee
Service Plan Details
Total kWh your system will produce per year
Adjust to match your plan structure
Sunk Cost Analysis
What you've already paid to the utility since moving in
Total Paid to Date
$30,126
Years in Home
17 years
First Monthly Bill
$122.11
Year 2010
Current Monthly Bill
$200.00
+$77.89/mo vs move-in
Annual Electricity Cost by Year
Year-by-Year Sunk Cost
| Year | Est. Rate ($/kWh) | Monthly Bill | Annual Cost | Cumulative Paid |
|---|---|---|---|---|
| 2010Move-in | $0.116 | $122.11 | $1,465.26 | $1,465.26 |
| 2011 | $0.118 | $124.21 | $1,490.53 | $2,955.79 |
| 2012 | $0.119 | $125.26 | $1,503.16 | $4,458.95 |
| 2013 | $0.124 | $130.53 | $1,566.32 | $6,025.26 |
| 2014 | $0.125 | $131.58 | $1,578.95 | $7,604.21 |
| 2015 | $0.127 | $133.68 | $1,604.21 | $9,208.42 |
| 2016 | $0.126 | $132.63 | $1,591.58 | $10,800.00 |
| 2017 | $0.131 | $137.89 | $1,654.74 | $12,454.74 |
| 2018 | $0.129 | $135.79 | $1,629.47 | $14,084.21 |
| 2019 | $0.132 | $138.95 | $1,667.37 | $15,751.58 |
| 2020 | $0.134 | $141.05 | $1,692.63 | $17,444.21 |
| 2021 | $0.139 | $146.32 | $1,755.79 | $19,200.00 |
| 2022 | $0.155 | $163.16 | $1,957.89 | $21,157.89 |
| 2023 | $0.165 | $173.68 | $2,084.21 | $23,242.11 |
| 2024 | $0.172 | $181.05 | $2,172.63 | $25,414.74 |
| 2025 | $0.183 | $192.63 | $2,311.58 | $27,726.32 |
| 2026Current | $0.190 | $200.00 | $2,400.00 | $30,126.32 |
| Total Paid to Utility | $30,126.32 | |||
Summary
Year 1 Utility/mo
$125.00
Year 1 Service/mo
$83.33
Monthly Difference
$41.67
Total Utility (25 yrs)
$82,296.77
Total Service (25 yrs)
$35,984.34
Lifetime Savings
$46,312.43
Over 25 years
Annual Cost Comparison
Year-by-Year Breakdown
Year 2 is when your solar service cost becomes lower than what you'd pay the utility, based on projected rate increases.
| Year | Utility/mo | Utility/yr | Service/mo | Service/yr | Monthly Savings | Annual Savings | Cumulative |
|---|---|---|---|---|---|---|---|
| 1 | $125.00 | $1,500.00 | $83.33 | $1,000.00 | $41.67 | $500.00 | $500.00 |
| 2 | $132.50 | $1,590.00 | $85.75 | $1,029.00 | $46.75 | $561.00 | $1,061.00 |
| 3 | $140.45 | $1,685.40 | $88.24 | $1,058.84 | $52.21 | $626.56 | $1,687.56 |
| 4 | $148.88 | $1,786.52 | $90.80 | $1,089.55 | $58.08 | $696.98 | $2,384.54 |
| 5 | $157.81 | $1,893.72 | $93.43 | $1,121.14 | $64.38 | $772.57 | $3,157.11 |
| 6 | $167.28 | $2,007.34 | $96.14 | $1,153.66 | $71.14 | $853.68 | $4,010.79 |
| 7 | $177.31 | $2,127.78 | $98.93 | $1,187.11 | $78.39 | $940.67 | $4,951.45 |
| 8 | $187.95 | $2,255.45 | $101.79 | $1,221.54 | $86.16 | $1,033.91 | $5,985.36 |
| 9 | $199.23 | $2,390.77 | $104.75 | $1,256.96 | $94.48 | $1,133.81 | $7,119.17 |
| 10 | $211.18 | $2,534.22 | $107.78 | $1,293.42 | $103.40 | $1,240.80 | $8,359.97 |
| 11 | $223.86 | $2,686.27 | $110.91 | $1,330.93 | $112.95 | $1,355.35 | $9,715.31 |
| 12 | $237.29 | $2,847.45 | $114.13 | $1,369.52 | $123.16 | $1,477.93 | $11,193.24 |
| 13 | $251.52 | $3,018.29 | $117.44 | $1,409.24 | $134.09 | $1,609.06 | $12,802.30 |
| 14 | $266.62 | $3,199.39 | $120.84 | $1,450.11 | $145.77 | $1,749.29 | $14,551.58 |
| 15 | $282.61 | $3,391.36 | $124.35 | $1,492.16 | $158.27 | $1,899.20 | $16,450.78 |
| 16 | $299.57 | $3,594.84 | $127.95 | $1,535.43 | $171.62 | $2,059.41 | $18,510.18 |
| 17 | $317.54 | $3,810.53 | $131.66 | $1,579.96 | $185.88 | $2,230.57 | $20,740.75 |
| 18 | $336.60 | $4,039.16 | $135.48 | $1,625.78 | $201.12 | $2,413.38 | $23,154.13 |
| 19 | $356.79 | $4,281.51 | $139.41 | $1,672.93 | $217.38 | $2,608.58 | $25,762.71 |
| 20 | $378.20 | $4,538.40 | $143.45 | $1,721.44 | $234.75 | $2,816.96 | $28,579.67 |
| 21 | $400.89 | $4,810.70 | $147.61 | $1,771.36 | $253.28 | $3,039.34 | $31,619.01 |
| 22 | $424.95 | $5,099.35 | $151.89 | $1,822.73 | $273.05 | $3,276.61 | $34,895.63 |
| 23 | $450.44 | $5,405.31 | $156.30 | $1,875.59 | $294.14 | $3,529.71 | $38,425.34 |
| 24 | $477.47 | $5,729.62 | $160.83 | $1,929.98 | $316.64 | $3,799.64 | $42,224.98 |
| 25 | $506.12 | $6,073.40 | $165.50 | $1,985.95 | $340.62 | $4,087.45 | $46,312.43 |