...another payload aboard the X-37B will be an experimental system designed by the Naval Research Laboratory that is capable of capturing solar power and beaming that energy back to Earth in the form of microwaves.
Yeah, that won't warm the atmosphere at all. Gerard K. O'Neill ping. Thanks BenLurkin.
The amount of power compared to the total solar flux is so miniscule as to be unmeasurable. Also, the in-orbit collectors intercept some of that incoming solar flux, so there "may" be no net increase, or an actual decrease in energy reaching the earth.