There will come a day Berlin will be under Warsaw's energy thumb,
Theoretically, it is already under it.
Germany alone, for example, has three separate unconnected gas pipelines that feed three parts of the country.
Without our goodwill, Germany will not be able to supply the eastern part of the country.
Ironically, Germany spent a pile of money to be able to bypass us and the rest of Eastern Europe in getting gas and to become an energy hub for all of Europe only to have it all go down in a matter of days thanks to Putin invading Ukraine and mysteriously destroying both NS.
Now Germany has to rapidly build other avenues for obtaining gas, while we are already a kind of energy hub* thanks to our investments and cooperation with our neighbors.
*We have a gas pipeline connection with Croatia for their LPG port, we have another one with Finladia if I haven't mistaken something and that goes through the Baltics, the Lithuanians seem to be finishing building a proper connection to our pipelines.
Our own LPG port, we plan to build a second one and a floating port. And now Baltic Pipe.
Ironically, we have everything we need to become an Energy Hub, which is what Germany was trying to become.
Still, just a few atomic power plants and we'll have peace and we can maliciously laugh at the ever-smarter Germans.
All in all, I'm beginning to suspect that war reparations, besides being an obvious way for the government to boost its ratings, serve or will serve other purposes.
As I look at it more and more, I think that in reality our government doesn't want these reparations, it wants to use them like a cudgel against any German demand, for example, just as you suggested, a rip-off on energy prices for Germany. This cudgel can silence Germans who complain about high energy prices every time. And seeing how our German react badly to this topic, one can assume that this will cause them to lose their minds every time it is mentioned.