Hmm. I know it's possible to add new yields, but it would be quite a task. One of the other stumbling blocks we had with this mod is when to make your citizens demand electricity. In the real world, there was no "flip of the switch" where people just demanded electricity. It spread slowly, over time, until it all the big cities had it. There was some legislation to make power companies power rural areas too, I believe... I haven't the slightest clue how to simulate that.
I know I know! I have been thinking this over since the old "We don't have the POWER captain!" thread. And what you do is base it on technology. For instance ...
Electricity = +2% Electricity Use
Refrigeration = +2% Electricity Use
Telegraph = +2% Electricity Use
Refining = +2% Electricity Use
Radio = +2% Electricity Use
Civil Engineering = +2% Electricity Use
Combustion = +2% Electricity Use
Industrialism = +2% Electricity Use
Plastics = +2% Electricity Use
Fission = +2% Electricity Use
Mass Transit = +2% Electricity Use
Electronics = +2% Electricity Use
Manufacturing = +2% Electricity Use
Computers = +2% Electricity Use
Mass Media = +2% Electricity Use
Semiconductors = +2% Electricity Use
Nuclear Power = +2% Electricity Use
Superconductors = +2% Electricity Use
Microprocessor = +2% Electricity Use
Robotics = +2% Electricity Use
Computer Networks = +2% Electricity Use
Globalization = +2% Electricity Use
Fiber Optics = +2% Electricity Use
3D Modeling = = +2% Electricity Use
Communications Networks = +2% Electricity Use ------------- 50%
Magnetic Levitation = +2% Electricity Use
Virtual Reality = +2% Electricity Use
Fuel Cells = +2% Electricity Use
Wearable Electronics = +2% Electricity Use
Cognitive Robotics = +2% Electricity Use
Knowledge Management = +2% Electricity Use
Rapid Prototyping = +2% Electricity Use
Biofuels = +2% Electricity Use
Automated Traffic = +2% Electricity Use
Controlled Plasma = +2% Electricity Use
Fusion = +2% Electricity Use
Skyroads = +2% Electricity Use
Advanced Computers = +2% Electricity Use
Wireless Electricity = +2% Electricity Use
Quantum Computing = +2% Electricity Use
Plastic Electronics = +2% Electricity Use
Personal Robotics = +2% Electricity Use
Nanoelectronics = +2% Electricity Use -82
Megastructure Engineering = +2% Electricity Use
Shielding = +2% Electricity Use
Mind Uploading = +2% Electricity Use
Advanced Shielding = +2% Electricity Use
Terra Computer = +2% Electricity Use
Teleportation = +2% Electricity Use
Sentient Earth = +2% Electricity Use ------------- 100%
As you can see gradually over time as they discover diffrent technologies then the % of electricity used goes up by 2%. Until by the end of the game you are 100% usage. Thus a level 10 city in the modern era will require significantly less power than a level 10 city in the trans-human era.