alt Hacker NewsActually the local cost is not the fuse size, but how much smaller the first transformer after you could be if you weren't there. Though it's often more fair to determine such for each user; then take those as a relative scale, then split the transformer's actual TCO by the determined share sizes between the users. Because the first user needs the transformer to it's peak size; the second only by the instantaneous-added peak size, which is lower as they won't use it peak at the same time.
> the first user needs the transformer to it's peak size; the second only by the instantaneous-added peak size
Of course, how does the electricity company determine which user was first in this situation. A tariff that depends on the order of connection may not be practical for domestic situations, although it may be OK for very large users, e.g. factories, data-centres.
Using fuse size seems a more reasonable and fair proxy for cost, assuming the same load patterns as the rest of the users. Then again, consumers with EVs might argue that their load pattern is different to the average user (e.g. filling up with off-peak electricity). Also consumers with air conditioning might argue for special treatment given their usage correlates with solar output (except where it does not).