Once you reach a global level of 2500,you will find a voting ballot at your home. When you pick it up, it asks if you want to start collecting votes to become mayor. Hit yes, and you will get everyone's vote...
Except the shopkeeper, who says you'll just raise taxes. He then goes back and says you can bribe him for 5 billion coins to vote for him.
If you decline it, the chef and miner will praise you for doing the right thing. You won't get the shopkeeper's vote however, but the majority still voted for you.
If you accept it, I don't know what happens. Much like the choice in the animal rights quest on dh2, there are two choices you could make, but one is 10x easier then the other.
Either way, I'm guessing you are now mayor.
When you accept, your rng takes a hit. Your city is failing on your first day at work. Maybe it's the shopkeeper getting revenge. The only thing you can do is build a turbine. You can build multiple turbines actually. You need a population of 60 ( you start with 50) to build other stuff.
Once you build 2 turbines, your population will start to grow.
Unlocked at some point around first time when water demand is covered.
Activate some services, starting with 2 of them at the same time. You can toggle on and off when you want.
Each service have some buff related with the City Management and the cost is money per second and person (population), for example, if you use Clean Energy (cost 0,6) and have a population of 500, the operation is:
Cost X Population = coins per second
So you spent 0,6 * 500 = 300 coins per second to run this service
Reduces the pollution produced from power plants by 50%
Hire engineers to better design your water pipes, tripling the volume limit per pipe.
Increases the population's global happiness.
Increases power output by 50%.
Doubles the staff for all police stations.
Increases the population's global happiness at the expense of requiring more educational faculties.