Thanks for your info. I'm currently on a fixed Red Energy tariff . Theydefaulted me initially on to a 90 days billing cycle , so I quickly changedit to monthly.Why ?Well, because of the demand charges.My consumption is very "lumpy". Our AC is the biggest consumer. Some weeksit's used, other weeks it's not at all.If we had a 90 day billing cycle , it means if I had one single heavy usageday ( say we had AC and the oven on), we would be penalised for 90 days ofdemand charges.Whereas for monthly bi ...