this enables large utilities to duly allow for the portfolio effect benefits of generating portfolios which includes generating technology with quite different cost and cost risk characteristics such as nuclear in comparison with portfolios dominated by the dash for gas the pervasive assumption of risk management officers that the gas price risk can be largely passed on to the customers on account of revealed strong correlation between the price of gas and the price of electricity might prove costly once the gas market turns from a buyers market to date into a sellers market aspects in need of further strengthening include the transformation from oneperiod analysis into multiperiod analysis building on recent work in this regard research to improve the credibility of covariance matrices used and segmentation of baseload midload and peakload technology