Most of these 1* reviews are from people who are not able to set up their own consumer accounts. Yes you get charged a Daily standing charge fee even if you don’t use any electric - the same as you would with a quarterly bill - Meterpay do not supply the electric , they merely offer the service of a smart meter for your convenience. The landlord who is responsible for paying the bill will be able to tell you which electric supplier they use for your property. You should be able to request a user manual for your meter from your landlord.
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