Revision to take into account technological developments. Were integrated: Renewable energy integration; Ease of compliance; Passive building design strategies; and Flexibility for designers.
Energy conservation building code of 2017 has a requirement of 20-40% solar heating in cold climatic regions depending on the floorpace. IEA/IRENA Global Renewable Energy Policies and Measures Database © OECD/IEA and IRENA, [November 2020]

Update: In 2024, the Bureau of Energy Efficiency launched stricter energy efficiency codes for new commercial and office buildings, while also extending the scope from energy efficiency to capture broader sustainability criteria, such as embodied carbon or circularity in materials.