I'm daily checking the Admin tab for Credits, I owned 50% of all credits before they bought them of currency shop, And now he is max shiplevel and soloing a damn Alliance. No one is selling Energy. Energy is much more Valuable and much harder to get then Credits but has the same price in Currencyshop. I wasted easly over 200-500 hours, I raided other people to get back to my first place and all this work is Literally nothing worth now, It's damn frustrating.
You could try messaging them and see if you could work together, couldn't hurt to ask at least.
For energy, there is a way to convert credits into energy via ports at a 2:1 ratio. 1 billion credits can bring 500 million energy which can be used in the alliance for offense, defense, or ship upgrades. Exploring for credits, collecting port interest, planet res, etc can build up energy pretty quickly if done certain ways.