STANDATA Variance on Energy Storage Systems in Residential Buildings

November 1, 2023

Industry has identified concerns regarding Energy Storage System (ESS) requirements. This variance permits the installation of an ESS at a dwelling unit or residential occupancy not exceeding 20 kWh for any single ESS, as an alternative method to the C22.1:21 – Canadian Electrical Code, Part I.

The current electrical code, C22.1:21 – Canadian Electrical Code, Part I, Rule 64-918 2) prohibits the installation of ESS’s utilizing batteries below grade, including basements of dwelling units. Additionally, 64-918 4) prohibits ESS’s with a storage capacity above 1 kWh from being installed in a dwelling unit or living space of a residential occupancy including clothes closets, storage rooms, bathrooms, stairways, or in any similar undesirable locations.

The next electrical code is C22.1:24 – Canadian Electrical Code, Part I is expected to contain requirements for ESS installations up to 20 kWh for any single ESS installed at a dwelling unit or residential occupancy.

The upcoming code provisions in the 2024 edition were developed by the CSA Group. Additional standards related to ESS’s include:

  • Batteries for Use in Stationary and Motive Auxiliary Power Applications ANSI/CAN/UL1973, which covers battery safety,
  • Energy Storage Systems and Equipment ANSI/CAN/UL 9540, which covers overall ESS system safety,
  • ANSI/CAN/UL 9540A Standard for Test Method for Evaluating Thermal Runaway Fire Propagation in Battery Energy Storage Systems, which covers fire propagation testing.

Go HERE for more information.

Related Articles


Changing Scene

  • E.B. Horsman & Son Announces Maxim Laberge as New Process Instrumentation Manager

    E.B. Horsman & Son Announces Maxim Laberge as New Process Instrumentation Manager

    EB Horsman is excited to welcome Maxim Laberge as its new Process Instrumentation Manager. Maxim brings over 25 years of experience in electrical, instrumentation, and control systems, with a proven record in business development, client engagement, and strategic project leadership. He is known for his consultative approach, combining technical insight with a strong focus on… Read More…

  • E.B. Horsman & Son Announces Stephen Murray as New Calgary Branch Manager

    E.B. Horsman & Son Announces Stephen Murray as New Calgary Branch Manager

    EB Horsman & Son is pleased to announce the appointment of Stephen Murray as Branch Manager of its Calgary location, effective Tuesday, September 3, 2025. Stephen brings over two decades of experience in the industrial automation sector, where he has built a strong reputation for driving growth, expanding market presence, and developing high-performing teams. His… Read More…


Peers & Profiles