Does a Charging Membership Make Your Free Referral Miles Worth Less?
Sam Whitfield, UK EV writer & Tesla owner · published 2026-09-02 · figures checked 2026-07-13.
Yes — and by a predictable amount. A free-miles reward displaces whatever you would otherwise have paid, so anything that lowers your per-kWh baseline lowers the reward's cash value. Here is the arithmetic, and the crossover where the membership still wins.
The two rates
Supercharger pricing, checked 2026-07-13: 41p/kWh on a membership, 53p/kWh without one. Both vary by site and time of day, so treat them as the reference points they are.
What that does to 650 free miles
| Baseline you avoid | Rate | Value of 650 miles |
|---|---|---|
| Supercharging, no membership | 53p/kWh | ≈ £98 |
| Supercharging, member rate | 41p/kWh | ≈ £76 |
| Home, standard | 24.5p/kWh | ≈ £46 |
| Home, off-peak | 7.5p/kWh | ≈ £14 |
Assumes 3.5 mi/kWh. The reward is identical in all four rows; only the avoided cost changes.
The crossover
A membership is worth having when the saving across your actual sessions exceeds its monthly fee. The referral reward does not change that calculation — it removes a fixed quantity of paid charging from the top of it. So the correct sequence is: work out whether the membership pays for itself on your normal charging pattern, then treat the 650 miles as a one-off reduction in the first six months of that pattern.
What you should not do is decline a membership because you are holding free miles. The reward covers roughly 5 to 6 sessions and then stops; the membership keeps working.
The interaction that surprises people
Holding a membership makes free miles worth less in cash terms, and that is not an argument against either. Both reduce your charging bill; they simply do not stack multiplicatively. The reward is drawn down automatically at the stall before any payment method is touched, so with a membership active you are displacing a member-rate charge rather than a public-rate one.
The six-month constraint on the whole exercise
Supercharging distance expires six months from the Grant Date, with a 30-day warning email and no reissue. That is what makes the "where do I spend it" question urgent rather than academic: the highest-value use is the most expensive charging you would otherwise have paid for inside that window.
The case where the membership loses
Worth modelling because the reward changes the answer at the margin. If your only public charging for the next six months is covered by the reward, a membership bought in that window pays a monthly fee to discount charging you were not going to pay for. The crossover therefore shifts: a driver who supercharges rarely, and who is holding 650 free miles, should consider starting the membership after the allowance is spent rather than alongside it. A driver who supercharges weekly will exhaust the allowance in the first two months and wants the membership from day one.
Sequence, in four lines
Decide the membership on its own merits. Note the Grant Date and add six months. Spend the reward on the most expensive charging you would have done anyway. Keep home charging for the cheap overnight hours it is already good for. Run your own figures in the charging-cost calculator.
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