Sounds pretty cool.

why not have it be basically the same thing as meteor control, but be a different visual effect in solar wells, just for the coolness of it?

If it was anywhere near realistic, it'd be pretty OP as it'd be a "Kill everything, including yourself" button.

Sins is supposed to be futuristic.

The idea is nice, but it might be overpowered even if it was a destroy-all. An damage/EMP effect with a flare from another part of the star is less OP IMO, with it disabling all friendly ships/starbases in the gravity well as well as enemy, to prevent 4 Starbases from spamming it and pretty much giving absolute control to the Starbase owner. It gives incentive to instead send a fleet to the star and get the drop on them.

Solar flares realistically do destroy like everything in their way (they're strong enough to damage satellites all the way here on Earth), but it'd probably be nerfed in the same way that nukes get nerfed in every RTS.