Played through this, this morning, you definitely got some really interesting ideas here. I really like the short prestige loop with a new mechanic on every prestige set up you have going. a little short, but a really solid proof of concept.
One minor critique, there's no real drawback to massively overproducing power to the point that the player doesn't really need to interact with most of the prestige challenges. Only real way around that I can think of is either capping the number generators somehow (number of active districts? and maybe a way to sell old generators to stay under cap?) or taking it in the other direction and rewarding grid codes based on speed to encourage players to run lean and fast? The fuel depot challenge is a great example of one way to solve this, I definitely found that one more engaging. the ability to sell excess power was also cool. Definitely a really solid start ideas wise, I'd love to see you continue on it.
Other minor thoughts/nitpicks/features Id love to see:
- An option to display renewables range by solid numbers (ex: 20MW~28MW instead of 24MW+/- 50%)
- A larger or more clear forecast bar, I couldn't really tell what it was doing most of the time and just waited for headroom to bottomed out instead.
- Different maps on each prestige? even the same nodes in different arrangements to keep them from feeling stale.
- Would be interested in combining multiple challenges in later prestige (saw the all at once option looking forward to it!)