Paragraph 2 Method of calculating hypothetical cost of purchasing certain electricity

The method of calculating what would have been the total cost to each public electricity supplier P of purchasing the electricity mentioned in paragraph 1 if that electricity had been generated by a fossil fuel generating station (which, when combined with the like total cost attributable to every other public electricity supplier, is expressed as By in paragraph 2 of Schedule 2) is given by the formula–

B_{y P} = \underset{n}{Σ} \underset{j}{Σ} (\underset{nj}{Y} \times \underset{nj}{Z}) + \underset{n}{Σ} [(\underset{n}{V} - \underset{j}{Σ} \underset{nj}{Y}) \times (\frac{\underset{j}{Σ} \underset{nj}{Z}}{\underset{n}{W}})]