What changes to Electricity are you proposing?
the way the game stands at the moment it hardly makes a difference if a city has electricity or not...
I usually wait until I have the Hoover Dam, or in some cases a fusion plant... because, in the end it makes no practical difference.
In reality though electrification was one of the driving forces of the second industrial revolution and is the basis of any progress..
Thus:
- General productivity should skyrocket
- Buildings should be faster to produce (20% or so - think of all the power tools!)
- Hospitals, Doctors should skyrocket in effectiveness - think of all the devices that need electricity or of a hospital without things like refigeration, elevators. etc..
- the Bonuses of refrigeration should be dependent on electricity - so +loads of food from grocers, supermarkets, bakeries etc.
- public transport should be more efficient - provide better bonuses
- research facilities, labs, universities etc. should be much more efficient.
- anti air defences are virtually only possible with electricity (You wanna use a candle as searchlight?)
- wonders like "Rock and Roll" and many others should be only possible to build with electricity (How could you find a cure for cancer, or do the human genome project withoult electricity???
- etc...
The point is - we are so used to electrical energy to our disposal that we completely underestimate its impact. The fact is that a civ with it should (as historically accurate) have a huge advantage!
My Suggestion: just give each city +75% commerce, + 75% productivity, 10% culture, + 25% health, +2 Happiness with electricity - that is easier than reajusting all those buildings that would need it. Also - it takes into account the improvements that people experience at home - due to home refigeration, electrical household devices etc... (you would need to make modern techs a little more expensive to compensate - but that makes sense - how would anyone research radio, quantum physics, computing etc. without access to electricity)
If it isn't too much work you might want to also disallow the construction of a lot of buildings and wonders - that don't make sense without electricity, for instance:
Cure for cancer, Human Genome Project, Lab, Fusion Testreactor, Supermarket, Rock and Roll, World News Network etc.
So please, please, please - change this...
(and while you are at it get the AI to make more millitary units)
You rule by the way