J. Hancock says that "sixty years ago nearly every large town/city had a complete infrastructure in place to provide electric powered transport. All affordable, convenient and pollution free".
The genesis of the electricity network that we know now was individual municipal corporations changing from horse-drawn to electric tramcars. There was no "grid" so they had to make their own electricity. The companies that supplied this kit usually over-estimated the power required (to allow for expansion of the tram system over time and to boost their sales in the short time) leaving the council with an excess of capacity, which they realised could be sold for domestic lighting, etc. The power stations were built near the centre of the tram system, which meant that many were built in the centre of town.They were invariably coal powered, with chain-grate stokers that struggled to reach 20% thermal efficiency, but as every house had its own open coal fire(s) nobody bothered about pollution. Battersea would have been one of the later and bigger examples.
The Tramways Act stipulated that tram systems had to be built and operated by companies independent of the councils, but could be bought out by a council after some years. This hindered investment no end. Why invest, only to get bought out before you had got your money back?
The council-owned transport was convenient, was apparently affordable (because some of the cost was hidden in the rates) but far from pollution free.
All this changed with the nationalisation of the electric companies after WW2. New, bigger, power stations were built out of town, a grid was built to connect them and Scotland embarked on the "Power from the Glens" programme.
And yes, I know about the steam powered trams widely used in the Midlands.They were coal-fired too.
Dick