Hi NeilC1.
VAT on electricity (& energy in general) actually depends on consumption. You should check your invoice to see which rate you've been charged.
Standard rate is 20% = 20.0%S in QB.
Reduced rate is 5% = 5.0%R in QB.
Fuel and power (VAT Notice 701/19)
https://www.gov.uk/guidance/vat-on-fuel-and-power-notice-70119
5.2 Supplies of small (de minimis) quantities
Supplies of not more than an average rate of 33 kilowatt hours per day, 1,000 kilowatt hours per month, of electricity to one customer at any one of the customer’s premises are subject to VAT at the reduced rate. This applies whether the bill is based on a meter reading by either you or your customer or on an estimate.
If your usage is below 1000kWh per month you will be charged at the reduced rate.