however things may not be quite as straightforward from the point of view of a private investor given that in a liberalised market the marginal fuel the one with the highest variable cost ie gas sets the price of electricity the electricity price in a liberalised market tends to fluctuate with the gas price thus preserving a rather stable profit margin for investors in gas in a market with regulated prices instead investors in nuclear would benefit from a stable profit margin and investors in gas would have to cope with the volatility of their cost base