Without getting into the "beamed down as what?" question, there should be plenty of energy at ground level.

Looking at a wind map of Europe, it looks as though Germany's North Sea coast has sufficient wind - and there are more and more being built offshore.

On the PV front, there have been recent advances in solar panel efficiency (essentially a Fresnel lens over each cell, intended to improve off-angle efficiency - but it also appears to help on cloudy days (which Germany has in great abundance). Speaking of clouds, yes they increase albedo (reflectivity back to space), but some wavelengths penetrate better than others - AKA radiation "windows". Some are in IR territory 0.2-5.5 μm (useful for passive cooling: dump heat to space), visible 8-14 μm, and UVA (300+). There's research going on in the PNW - another cloudy place). Current solar cells don't do much with those wavelengths. I don't have enough physics to opine on whether producing optimized ones is possible - but as a layperson I don't see it as a greater challenge than that of beaming energy down from above the atmosphere.

I'd also point out that putting something in space requires propulsion, which involves dumping a good bit of CO2 into the atmosphere. This is most problematic above the troposphere.

Just my $0.02