Exorbitant power consumption house construction single-family house experiences

Hello everyone,

I built a single-family house with a developer, and according to the construction contract, I bear the electricity costs for the construction of the house. After about 9 months of construction, an astonishing 25,000 kWh were consumed. This corresponds to about €8,000 in electricity costs. In my opinion, the main electricity drivers were the heating program for the screed as well as various fan heaters/drying devices that were in the house for some time.

I wanted the general contractor to cover part (€4,000) of the electricity costs, but unfortunately, he is not willing to negotiate and refers to the contract. My logical explanation would be that as a layperson, I can assume there will be a usual electricity consumption or electricity costs that average between €2,500 and €3,500 for a single-family house (depending on the season and other factors).

Does anyone have similar experience or a suggestion on how to involve the general contractor (50%)?

Thanks in advance!

Why was the heating-up phase for the screed done using electricity?
We actually ended up with almost €3000 in construction electricity costs and an additional €1000 in district heating costs due to the heating program, which was completely unexpected.
That was the biggest negative surprise for us...
But for you it's double that, which is just insane.

Unfortunately, I don't see how the construction company could be involved.

In December, we heated about 90 m² of cement screed in a KfW Efficiency House 55 (bungalow) using a mobile electric heating unit (up to 60°). Consumption during this period was just under 3000 kWh. With your 25,000 kWh, there must have been other significant consumers. Did you see these meter readings yourself in the construction power cabinet, or could there be a possible reading error?

We have geothermal energy and our heating engineer said it would be better not to run the heat pump at full capacity immediately during the screed heating program, which is why everything was done electrically up to 48 degrees. I would be happy with 3000€ construction electricity :)

Unfortunately, there is no reading error, I have seen the over 25,000 kWh myself on the meter

Were the windows open or was the house not insulated?
Only your construction site was running through the meter and it was at zero before?

We have geothermal energy and our heating engineer said it would be better not to run the heat pump at full load immediately during the screed heating program, so everything was electric up to 48 degrees. I would be satisfied with 3000€ construction electricity :) Unfortunately, there is no reading error, I saw the over 25,000 kWh myself on the meter

So the heat pump was used with an electric heating rod for screed drying/heating? What kind of heating rod for the heat pump? Small heat pump = small heating rod = 3 kW. Let’s just calculate a normal heating program with 21 days running time. Even if the heating rod ran at full power around the clock (which it doesn’t have to, since low temperatures are also needed), that would be 2,100 kWh. Or was a mobile electric heating unit with e.g. 36 kW running? They would then have their own integrated meters. Construction dryers often also only run at 2 kW power. Something went seriously wrong here... Have them explain to you in detail which devices were in use and for how long.