# The Fossil Fuel Levy Regulations 1990, Paragraph 3: Method of calculating hypothetical cost of purchasing certain electricity


In the formula in paragraph 2–
Σn signifies the summation over all the qualifying months within period y;
Σj signifies the summation over all the half hours (beginning on the hour or on the half-hour) within month n;
Ynj is the number of units of the electricity referred to in paragraph 1 supplied in each particular half hour within month n where that number is known;
Znj is the market price in each half hour within month n as defined in regulation 19 except during a security period, when it shall be a price determined as the Director, after consultation with licensed suppliers, sees fit;
Vn is the number of units of the electricity referred to in paragraph 1 within month n; and
Wn is the number of half hours in month n.

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Source: https://www.legislation.gov.uk/uksi/1990/266/schedule/3/paragraph/3 (the official version)
Page: https://openlegislation.uk/fossil-fuel-levy-regulations-1990/schedule-3/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.