MoneySavingExpert Chair, Martin Lewis · Editor, Marcus Herbert

# Fixed or Variable rate

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Posts: 8 Forumite
EDF variable rate if I change tariff is £147 compared to current DD of £299 fixed rate.

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• Posts: 2,185 Forumite
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can you please provide information of what exact tariff you are on & your actual annual energy usage?
• Posts: 8 Forumite
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Electricity day unit rate: 38.74p per kWh
Electricity night unit rate: 20.36p per kWh
Daily standing charge: 51.71p per day

### Fix Total Service Apr24v2 (E7)

Annual use 7164 kwh
• Posts: 9,286 Forumite
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Electricity day unit rate: 38.74p per kWh
Electricity night unit rate: 20.36p per kWh
Daily standing charge: 51.71p per day

### Fix Total Service Apr24v2 (E7)

Annual use 7164 kwh
... and the split between day/night?

• Posts: 1,448 Forumite
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Electricity day unit rate: 38.74p per kWh
Electricity night unit rate: 20.36p per kWh
Daily standing charge: 51.71p per day

### Fix Total Service Apr24v2 (E7)

Annual use 7164 kwh
How much of your annual use is day time and how much is night time?

• Posts: 8 Forumite
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74% night time
• Posts: 0 Newbie
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EDF variable rate if I change tariff is £147 compared to current DD of £299 fixed rate.

Just remember that’s an estimate of yearly usage spread out of course, not showing that one tariff is half the price of the other.
• Posts: 21,482 Forumite
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74% night time
My gut feeling is that yes, a change to the SVR will work out substantially cheaper for you as the night rate is so much lower.  I suspect someone will be along with the actual maths in a short while though!
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• Posts: 1,161 Forumite
edited 6 October 2022 at 3:01PM
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Assuming your estimate of 7164 kWh is realistic, then

Total night usage = 7164 * 0.74 = 5301
Total day usage = 7164 - 5301 = 1863

Total standing charge = 365 * 0.5171 = 188.74
Total night cost = 0.2036 * 5301 = 1079.28
Total day cost = 0.3874 * 1863 = 721.73

Overall total = 1989.75

Month cost = 1989.75 / 12 = 165.81

• Posts: 8 Forumite
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Electricity day unit rate: 38.74p per kWh     42.75 new rate
Electricity night unit rate: 20.36p per kWh   14.82   "      "
Daily standing charge: 51.71p per day        52.74   "      "
• Posts: 1,161 Forumite
edited 6 October 2022 at 3:18PM
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Total night cost = 5301 * 0.1482 = 785.61
Total day cost = 1863 * 0.4275 = 796.43
Daily Standing charge = 365 * .5274 = 192.51

Overall total = 1774.51

Monthly cost = 147.87

You would be £17.94 better off a month.  This, of course, would change negatively if you day usage increased.

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