There isn't a definitive guide, AFAIK. You need to take into account a number of variables, including production costs, available resources, and energy needs. Solar plants being the cheapest and not costing anything to maintain, are the obvious initial choice. Reactors, on the other hand, get you much more energy but are more costly, and also gobble up deuterium. The sats, on the third hand, cost plenty in crystal and none in metal, but their energy production depends on max temperature. So, taking all these into account, I'd say it's impossible to figure out a single "optimal" balancing method for energy sources that would apply to all planets.