Economy seven

Had smart meter fitted today man asked why we used economy seven as its only cost effective if you use 60% of your electricity in the night he thought we would be better off on normal tariff is this true

Do you have electric storage heating and a large, electric only hot water cylinder? If so, economy 7 is likely to work out cheaper. If not, you will almost certainly be using more electricity during the day than you do during off peak hours, in which case a standard tariff is likely to suit you better.