First please fix the turrets at the base with extra firepower and health. Too easy to destroy them when rushed. Maybe have an upgrade for the turrets, but it would cost alot to upgrade though to each stage?
The biggest problem right now with the game units and vehicles and ships don’t cost that much. If stuff cost more, you would not attack like a clown because it cost you to build more units and vehicles again. You try to attack a base more strategically.
Also capturing electricity poles should see a better boost with power.