Construction site electricity costs for shell construction without screed drying

Hello dear community, I currently have a problem on our construction site that I don't yet know how to deal with. Here's the situation: We were kindly able to obtain the necessary electricity for our shell construction from a neighbor. To keep everything proper, we installed a construction power distributor with calibrated measurement and plugged it into a CEE16A socket at the neighbor's place. After the construction was closed, we immediately had our own proper meter installed and have been drawing our "construction power" from it. According to our meter, we used a little over 300 kWh, which seems completely realistic to me since we didn't have a crane, stone saw, or heater in use. Even the screed heating program was already running through our house connection. Now, the mentioned neighbor received his electricity bill and used 3400 kWh more than the previous year and believes this is our fault and naturally wants the money for it from us. The construction power distributor was connected to his meter for about half a year. The amount seems unreasonably high to me, especially since our meter shows something different. We then had our meter checked by a specialist company, but as expected, it is completely fine. Now my question to you... Does anyone have any idea how I should proceed with this or where this enormous difference could come from. Many thanks in advance!

Is one of the two numbers possibly shifted by a decimal place? 340.0kWh? That would then fit, or 3000kWh for you? But I think you both have already checked this? Have you seen/checked the invoice from him?

Yes, of course, that was also our first thought. But both meter readings match and there is no sign of a digit reversal. His billing also seems to be correct.

That's bad, the neighborhood is off to a rough start. Your 300 kWh also seems more realistic according to your explanation. Check with the neighbor to see if something was billed incorrectly, like the old meter reading, new meter reading. What was the neighbor's total consumption?

According to the bills, he has consumed about 4800 kWh over the past two years. Now it is 8200 kWh. Yes, none of us wanted that either, but I also can't find any reason why we should be responsible for this consumption. Even if the construction power meter did not count 100% accurately, I don't believe it only counted 1/10. Especially since after a test and the inspection everything was OK. It counts exactly what it is supposed to.

According to the bills, he consumed about 4800kWh in the last two years. Now it’s 8200kWh. Yes, none of us wanted that, but I also can’t find any reason why we should be responsible for this consumption. Even if the construction power meter didn’t count 100% accurately, I don’t believe it only counted 1/10th. Especially since after a test and inspection everything was OK. It counts exactly what it’s supposed to.

That went badly. You won’t have many choices if he had a consumption roughly 3400kWh less in the last two years.

There are only these solutions:
- You don’t pay (neighborhood be damned)
- You share the 3400kWh (neighborhood maybe be damned)
- You pay the 3400kWh (you lose 1000€)
- He reports his electricity meter as defective and has to hassle with the grid operator (it becomes his problem and he has the trouble which you somehow have to compensate)