Take one kilowatt-hour. In a flat in Manchester it might cost you around 25p. In an apartment in Pune, depending on how much you have already used that month, it could cost anywhere from 4 to 12 rupees. Same physics. Same electron doing the same work. But behind those two numbers sit two completely different machines, different regulators, different risk carriers, different failure modes, and if you work anywhere near energy trading, understanding both machines teaches you more about commodity risk than most derivatives textbooks.
I have delivered trading systems into desks that price power on both sides of this divide. The single most useful thing I learned is this: the retail price of electricity is not a price. It is the visible end of a chain of risk transfers, and every link in that chain is a decision someone made about who should hold commodity exposure. The UK and India made opposite decisions almost every time.
