Hmm, I might bring back the money balance but also let the player choose how much they charge per MW. Charging too much would lower your reputation and if it falls too low you lose the game, while charging a lower amount improves reputation. Because my issue before was that the amount earned per MW is arbitrarily set by the game, which isn't really realistic.
I'll keep the new meters I created in addition to the above, so the player can see how much it costs them to produce each MW vs how much they are selling each MW for - the difference being the profit which can be used to upgrade the grid etc.
Thanks for the feedback.