Distribution System Code (DSC)

Sets out the minimum obligations that a licensed electricity distributor must meet in carrying out its obligations to distribute electricity within its service area under its licence.

Industry Codes/Rules
Last revised
October 1, 2022

Related documents

Amendments to the DSC

31. Amendments related to the connection of distributed energy resources (DERs) to local electricity distribution systems. These amendments came into force on October 1, 2022 (EB-2019-0207, EB-2021-0117). More information | October 1, 2022 version (pdf)

30. Amendments to facilitate regulatory changes to net metering and retailing. These amendments came into force on July 1, 2022 (EB-2022-0152). More information | July 1, 2022 version (pdf)

29. Amendments relating to Phase 1 of the OEB’s Customer Service Rules Review (EB-2017-0183). These amendments came into force in three phases: on March 14, 2019, on July 1, 2019, and on March 1, 2020. More information | March 1, 2020 version (pdf)

28. Amendments that are aimed at ensuring the Cost Responsibility rules for load customers in the TSC and DSC are better aligned and facilitate the implementation of Regional Plans. These changes came into force on December 18, 2018 (EB-2016-0003). A related supplemental DSC amendment came into force on February 14, 2019. More information | February 14, 2019 version (pdf)

27. Amendments to implement the OEB’s policies related to Protecting Privacy of Personal Information and the Reliable Operation of the Smart Grid in Ontario that came into force on March 15, 2018. More information 

26. Amendments in relation to the the Fair Hydro Plan changes to the Ontario Electricity Support Program (OESP) and net metering that came into force on May 25, 2017. More information

25. Amendment in relation to the deletion of section 5.4.1, which required that the form of agreement between a distributor and the Smart Metering Entity or the IESO be approved by the OEB. The amendment came into force on May 18, 2017. More information

24. Amendments in relation to the elimination of load transfer arrangements that came into force on December 21, 2015. More information

23. Amendments to support the implementation of the Ontario Electricity Support Program (OESP) that came into force on October 8, 2015. More information

22. Amendments in relation to billing frequency, the use of estimated billing, and billing accuracy that came into force on April 15, 2015. More information

21. Amendments to implement the Board's policies with respect to unmetered load customers and distributor Conditions of Service came into force on January 1, 2015. More information

20. Amendments to implement the Board’s policies related to requiring distributors to install interval meters for customers with monthly average peak demand during a calendar year of over 50 kW. More information

19. Amendments to implement the Board’s policies related to Regional Infrastructure Planning. More information

18. Amendments to the DSC in relation to the connection process for micro-embedded generation. More information

17. Amendments in relation to connection timelines for large embedded generators. More information

16. Amendments that address customer service issues applicable to all residential customers. More information
Note: The customer service amendments approved on July 2, 2010 came into force in stages on October 1, 2010, January 1, 2011 and April 1, 2011.

15. Amendments that address issues related to the DSC's alternative bid provisions. More information

14. Amendments in relation to distributor-owned generation. More information

13. Amendments in relation to assigning cost responsibility as between a distributor and a generator in relation to the connection of renewable generation facilities to distribution systems. More information

12. September 21, 2009 amendments to the generation connection and capacity allocation process and for account treatment of embedded retail generators.

11. Amendments to include the addition of a ‘Farm Stray Voltage Distributor Investigation Procedure’ (Appendix H) and for Customer reclassification and non-payment risk issues.

10. Amendments to extend the time period for geographic distributors to eliminate their long term load transfer arrangements came into force June 10, 2009. More information

9. Amendments to facilitate the connection of smaller size embedded generation facilities, came into force February 12, 2009. More information

8. Amendments with respect to Electricity Service Quality Requirements, in force as of January 1, 2009. More information

7. Amendments with respect to load transfers came into force as of March 12, 2007. More information

6. Amendments to Chapter 3 - Connections and Expansions, in force as of January 23, 2007. More information

5. Please note that there is no change to any of the Distribution System Code or Retail Settlement Code amendments issued by the Board on October 30, 2006.

4. Amendments regarding the connection of new generation to distribution systems. More information

3. Amendments regarding consumer security deposits. More information

2. Amendments regarding maximum cumulative generation from net metered generators that the distributor must allow to be connected and a revised version of the net metering threshold table that accompanied Notice of the net metering amendments to the Distribution System Code (EB-2005-0447). 

1. Amendments regarding the treatment of bulk-metered residential condominiums for security deposit purposes. More information (pdf)