# The Energy Act 2004 (Assistance for Areas with High Distribution Costs) Order 2005, Paragraph 3


The licensee shall issue to each authorised supplier an invoice for the amount determined by applying the p/kWh tariff to the units of electricity actually supplied by each authorised supplier during each period in relation to the relevant year t specified in the following table and such invoices shall be issued in respect of each such period in relation to the relevant year t by the dates specified in the following table specifying the amount due and the date required for payment of such amount by the authorised supplier which shall not be more than 28 days from the date of the invoice.
Period in relevant year
Invoice dates in relation to relevant year
April to June
15 August
July to September
15 November
October to December
15 February
January to March
15 May

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Source: https://www.legislation.gov.uk/uksi/2005/528/schedule/7/paragraph/3 (the official version)
Page: https://openlegislation.uk/energy-act-2004-assistance-for-areas-with-high-distribution-costs-order-2005/schedule-7/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.