A few more things I noticed, and then I'll leave you be.
There don't seem to be any true enforced maximums of these gauges:
Research doesn't actually seem to progress at all if you only give it 50:
A way to input the percentages instead of only having sliders would be great for people that like clean numbers:
The fact that destroying a power line costs over 6 times the amount used to build it feels off:
The offers aren't nearly as efficient as just straight selling off the power to the city is:
Research costs accumulate as work debt, even if you have money for R&D to just take:
The fact that the numbers of boilers and turbines actually represent °C only became clear to me when you mentioned it:
Would be nice to have some sort of auto-refill option for these (It also wasn't clear to me at the start that I had to click the cube button there):
I feel it would be nice to be able to cancel/turn off destruction mode by right-clicking:
Hope this helps you out. I'm really liking the look of the game, and look forward to seeing more.
Best of luck.