Unrelated to the transmission fees: in general German prices are probably at least 2x, maybe even 3x from those in the US. But partly that's due to the US being ridiculously resource rich, outside of its geopolitical access to energy (traded worldwide mostly in US currency), making energy quite cheap wholesale. And partly it's due to various tariffs that push Germans towards efficiency, making energy quite expensive for the end user, but leading to Germany producing a substantially higher $ amount (gdp) per unit of energy spent than the US.