1. IEEE Guide for Electric Power Distribution Reliability Indices (2012) IEEE Std 1366, p 43
2. Electricity Distribution Quality of Service Report 2008/09 (2009) Office of Gas and Electricity Markets (OFGEM) Annual Report
3. The Electricity Standard of Performance Regulations Statutory Instruments (2010) In Standard No. 698, Office of Gas and Electricity Markets (OFGEM)
4. The Electricity (Standards of Performance) Regulations (2015) Standard No. 699, Office of Gas and Electricity Markets (OFGEM)
5. RIIO-ED1 Annual Report for the Distribution Network Operators Performances in 2017–18 (2018) Office of Gas and Electricity Markets (OFGEM), London, pp 1–52