My Model X is the single biggest electrical load at my house. On the October 2026 FPL bill it used 903 kWh — more than the whole house netted from FPL that month (703). Here’s how I charge it on FPL’s EVolution home program, what it really costs per kWh, and how solar does (and doesn’t) fit in.
How the setup works
I enrolled in FPL EVolution Home on July 13, 2024. The charger is on its own FPL sub-meter, separate from the house, and is billed on the RS-1 EV rate:
- Off-peak charging: a flat $19.81 a month, no matter how many kWh.
- On-peak charging: $0.27067 per kWh. That’s more than double the house rate, so I avoid it.
- EVolution Home charge: $18.41 a month for the program and charger.
Total fixed cost: about $38.22 a month, or roughly $459 a year. On my October 2026 bill, all 903 kWh were off-peak and 0 were on-peak. Getting that right is just a matter of scheduling charging overnight in the car.
How much the car uses
Charging energy by month
kWh per month
Tesla app “Vehicle” energy (2 significant figures). Charging starts July 2024. October 2026 runs through Oct 23.
Show the numbers
| Month | Vehicle kWh | EVolution ¢/kWh |
|---|---|---|
| 2024-07 | 737 | — |
| 2024-08 | 923 | — |
| 2024-09 | 897 | — |
| 2024-10 | 830 | 4.6 |
| 2024-11 | 770 | 5.0 |
| 2024-12 | 805 | 4.7 |
| 2025-01 | 870 | 4.4 |
| 2025-02 | 870 | 4.4 |
| 2025-03 | 980 | 3.9 |
| 2025-04 | 1,000 | 3.8 |
| 2025-05 | 1,000 | 3.8 |
| 2025-06 | 1,000 | 3.8 |
| 2025-07 | 1,100 | 3.5 |
| 2025-08 | 1,100 | 3.5 |
| 2025-09 | 840 | 4.6 |
| 2025-10 | 1,000 | 3.8 |
| 2025-11 | 880 | 4.3 |
| 2025-12 | 900 | 4.2 |
| 2026-01 | 770 | 5.0 |
| 2026-02 | 850 | 4.5 |
| 2026-03 | 1,100 | 3.5 |
| 2026-04 | 1,000 | 3.8 |
| 2026-05 | 970 | 3.9 |
| 2026-06 | 970 | 3.9 |
| 2026-07 | 980 | 3.9 |
| 2026-08 | 940 | 4.1 |
| 2026-09 | 960 | 4.0 |
| 2026-10 | 720 | 5.3 |
It averages about 920 kWh a month, with a range of 737 to 1,100. That was 11,540 kWh for 2025 and 9,260 kWh in 2026 through October 23. As a cross-check, the FPL EV meter showed 903 kWh for September 13 to October 13, 2026, while the Tesla app showed 960 for September — different date ranges, same ballpark.
What it costs per kWh
Divide the flat $38.22 by each month’s kWh and my effective price has been 3.5–5.3¢ per kWh, about 4.1¢ on average. The same energy on the house’s RS-1 rate would cost 12.3–14.3¢. That’s a savings of roughly $75–90 a month versus plugging the car into the house meter.
Cents per kWh, three ways
EVolution: $38.22 flat ÷ monthly vehicle kWh, Oct 2024–Sep 2026. RS-1 and on-peak: my October 2026 FPL bill, before taxes.
The flat fee rewards heavy use. If you drive very little, $38.22 a month could cost more per kWh than the regular rate. At about 290 kWh a month the two roughly break even ($38.22 ÷ 13.3¢).
So where does solar fit?
Honestly: not much, for the car. Because the charger is on a separate meter billed at a flat rate, every off-peak kWh costs the same $19.81 whether my roof made a lot that day or nothing. My solar credits go to the house meter. The car charges overnight anyway, when there’s no sun.
What solar does is keep the house side of the bill low, and that’s what lets the total stay small even with a big EV in the driveway. In 2023, with no solar and no car, I paid FPL $4,269. Over the last 12 months, with solar and the Model X, it was about $1,195 including the EVolution fees (bill details).
A battery caveat
If you run Powerwalls with a low reserve, they may discharge into the car overnight. That moves battery energy (with its losses) into a load that’s already billed at a flat rate — a poor trade. It’s one more reason I keep my reserve at 100%. Check your Tesla app’s charging behavior before lowering it.
What if the car were on the house meter?
People ask why I don’t just charge from solar. Here’s the comparison with my own 2025 numbers (estimates):
| 2025, 11,540 kWh of charging | Approx. cost |
|---|---|
| FPL EVolution (what I do): 12 × $38.22 | ≈ $459 |
| Same kWh on the house RS-1 rate, 12.3–14.3¢ | ≈ $1,420–1,650 before taxes |
| Difference | ≈ $960–1,190 a year |
Here’s the catch. In 2025 my house sent FPL 11,750 kWh of solar, almost exactly what the car used (11,540). On paper the roof “covers” the car. But those credits already lower the house bill at the full retail rate. Moving the car onto the house meter would use up the same credits on kWh that EVolution charges me about 4¢ for. On FPL’s current rules, the two separate meters are the cheaper setup for me.
The months that cost the most and least per kWh
- Cheapest: July and August 2025 at about 1,100 kWh each, or about 3.5¢ per kWh.
- Most expensive: November 2024 and January 2026 at about 770 kWh, or about 5.0¢. October 2026 shows 5.3¢ only because the month runs through October 23.
- The swing is all driving. The fixed fee doesn’t change, so the more I charge, the cheaper each kWh gets.
Where the car fits in my overall energy picture
In 2025 the house (without the car) used 34,400 kWh and the car 11,540, for a total of about 45,940 kWh. Solar used directly on site covered 19,550 of that, or 42.6%. Net, I bought about 15,150 kWh from FPL over the year, and the car accounts for most of it. If you’re sizing solar and you have an EV on a flat-fee program, size for the house. If your utility has no flat EV plan, the math changes and the car becomes a reason to add panels.
Practical tips
- Schedule charging off-peak in the car. One accidental on-peak session at 27¢ eats a lot of the savings.
- Read the EV meter lines on every bill. “EV on-peak kWh used” should be 0.
- Run the break-even. Under about 290 kWh a month, the flat fee may not be worth it.
- Don’t oversize solar for the car if it’s on EVolution: the flat rate already makes charging cheap, and solar can’t lower it.
- Keep the battery reserve high so the Powerwalls don’t drain into overnight charging.