It would be very nice if the Storage could be upgraded to have more capacity when it's upgraded, currently it still only stores 500 at all levels.

After roughly uber level the economy completely crashes - even on a small map with six mexes (upgraded) once the energy generation reached a high enough level (~500k) the metal generation tanked from several thousand to around 74. Very strange behaviour, reproducible by starting to reclaim a power plant (restored metal income) and repair it (broke it)