• Implementation of an Energy Management System (EnMS) in accordance with the ISO 50001 Standard

    ISO 50001 certificate for DCD

    ISO 50001 Certificate for DCD

    ISO 50001 certificate for EMD

    ISO 50001 Certificate for EMD

    Since December 2011, we have established and implemented an EnMS in accordance with the ISO 50001 standard on our residential building design. Through the implementation of the EnMS, a baseline and an Energy Performance Indicator (EnPI) for energy consumption of building services installed in the communal areas of the public housing blocks were initially set at 30 kWh/m² annually, and applied to all our new projects for comparison, and for design adjustment to achieve the target performance if necessary. This EnPI was tightened from 27 kWh/m² to 24 kWh/m² in 2016 and reduced to 23.5 kWh/m² in 2020 to further enhance the energy performance of our designs.

    The ISO 50001 EnMS was built on a Plan-Do-Check-Act management model which focused on energy efficiency, use and consumption in communal building services installations of domestic public housing blocks. In June 2012, we obtained the ISO 50001:2011 certification on residential building design. With the promulgation of the 2018 edition of ISO 50001 in August 2018, we successfully transited to ISO 50001:2018 in August 2020.

    For the existing estates, Kwai Shing West Estate was the first residential estate and the first public rental housing (PRH) estate in Hong Kong granted with ISO 50001 certification in June 2013. With the successful experiences gained at Kwai Shing West Estate, we extended the certification to cover all existing PRH domestic blocks by April 2015 in two phases.

    The Phase One certification covering the domestic blocks in 92 PRH estates was obtained in August 2014 and the Phase Two extended certification to cover the domestic blocks in all existing estates has been obtained in April 2015. With the promulgation of the 2018 edition of ISO 50001 in August 2018, we successfully transited to ISO 50001:2018 in June 2020.

  • Optimisation on Illumination Level of Domestic Blocks

    To meet accessibility requirements as laid down in the Design Manual: Barrier Free Access 2008 promulgated by the Buildings Department, the illumination standard for public areas has been increased to accommodate people with special needs such as those with vision impairments. To achieve this standard without increasing energy consumption, a two-level lighting control system has been adopted in new domestic block designs since December 2008. The system allows users to adjust lighting levels as needed. The illumination levels for public areas are as follows:

    Public Areas of Domestic Block

    Normal Mode

    Triggered Mode

    for typical lift lobby

    50 lux

    85 lux

    for typical corridor

    30 lux

    85 lux

    for staircase

    30 lux

    85 lux

    for ground floor lift lobby

    120 lux


    for lift car

    150 lux


    Raise the lighting level of public areas 1

    Raise the lighting level of public areas

    Two level lighting control system  2

    Two level lighting control system

  • Adopting EMSD's Code of Practice for Energy Efficiency of Building Services Installation

    All new buildings comply with the Building Energy Codes issued by EMSD for lighting, electrical, HVAC, and lift/escalator systems. As of August 2015, 237 HA buildings had received Certificates of Compliance Registration under the Building Energy Efficiency Ordinance from EMSD, demonstrating compliance with energy efficiency requirements.

    'Hong Kong Energy Efficiency Registration Scheme' Energy Certificates 1

    'Hong Kong Energy Efficiency Registration Scheme' Energy Certificates

  • Photocell Sensor Control for Lights in Public Areas of New Domestic Blocks

    Photocell sensor controls for lights are installed in areas with natural light fenestration, such as areas near the windows in communal areas, to switch off some lights to save energy when the illumination level is adequate.

    Photocell sensor controls for lights 1

    Photocell sensor controls for lights

  • The Use of Electronic Ballast to replace Electromagnetic Ballast

    For fluorescent type lighting fittings, about 20% of electrical energy could be saved if electronic ballast is used instead of electromagnetic ballast. In view of this, since 2003, we have widely adopted the use of electronic ballast. At present, all fluorescent type lighting fittings are equipped with electronic ballasts.

    Starting from 2012/13, we have launched a 42-month programme of replacing existing light fittings equipped with electromagnetic ballast by energy-saving electronic ballast in communal areas of all our existing estates, covering around 960 domestic blocks. The replacement work for all 960 domestic blocks have been completed in September 2015.

  • Wider Use of LED Lighting

    To increase energy efficiency, HA has adopted LED lighting in new developments. Since early 2016, LED bulkheads have been the standard luminaire for communal areas in new domestic blocks. HA has also adopted LED exit signs, directional signs, and tubular lamps in new projects starting in 2019.

    For existing PRH blocks, starting from 2019/20, LED bulkheads have been adopted in communal areas to replace defective public lighting. Besides, LED exit signs and directional signs are also used to replace the conventional ones.

    LED bulkheads 1

    LED bulkheads

    LED exit sign 1

    LED exit sign

    LED tubular lamps 1

    LED tubular lamps

  • Variable Speed Drive Control for the Fresh Water Booster Pumping System

    To improve energy efficiency, HA have adopted variable speed drive control for the fresh water booster pump system in all new projects. Together with smaller stainless steel pneumatic pressure vessels, the system could achieve higher energy efficiency and occupy less plant room space.

    Variable Speed Drive Control for the Fresh Water
                                      Booster Pumping System 1

    Variable Speed Drive Control for the Fresh Water Booster Pumping System

  • Hybrid Ventilation / Free Cooling System

    To improve sustainability, HA has adopted innovative HVAC systems in some new developments. For example, hybrid ventilation and free cooling systems at shopping centers combine natural and mechanical ventilation to reduce energy use. By switching between ventilation modes based on users’ need, these systems decrease energy consumption and hence carbon emissions. HA will consider using this system in other appropriate projects in accordance with relevant guidelines.

  • District Cooling System

    HA has adopted innovative technologies such as district cooling systems (DCS). The PRH developments at Kai Ching Estate and Tak Long Estate developments use a centralized DCS provided by the Electrical and Mechanical Services Department (EMSD) to supply chilled water to air conditioning systems for non-domestic facilities including shops, kindergartens, and estate offices. Through centralized cooling, the DCS can save up to 35% more energy than conventional systems.

  • Energy-saving Technologies and Initiatives for New Lift Installations

    HA has adopted energy-efficient technologies for lifts. These include permanent magnet synchronous motors, regenerative drives for high-power motors, and gearless/machine-room-less lifts. These technologies increase energy efficiency and reduce space requirements. By utilising these technologies, HA is working to create greener public housing.

  • Smart Meter Monitoring and Energy Information Display System

    To encourage sustainable living, HA has adopted technologies that provide energy usage information to residents. The Smart Meter Monitoring and Energy Information Display System comprising smart meters and displays that show electricity, gas, and water consumption for blocks in the estate at the main entrance lobbies. The displays facilitate comparison of energy use between blocks, raising awareness of conservation opportunities. By providing transparent data, the system helps residents understand and reduce their environmental impact. Through initiatives like this, HA is working with residents to build a greener community.

    Smart Meter 1

    Smart Meter

    Smart Meter 2

    Smart Meter

    Smart Meter

    Display of the smart meter monitoring
                                        system at ground floor lobby of Tak Long
                                        Estate 1

    Display of the smart meter monitoring system at ground floor lobby of Tak Long Estate

  • Renewable Energy Installation

    To promote the use of renewable energy in line with Government’s policy, HA has incorporated photovoltaic (PV) systems into public rental housing blocks where technically feasible since 2011. New rental housing blocks have included grid-connected PV systems that generate renewable electricity for communal areas providing 1.5-2.5% of communal electricity needs. HA continues to explore and pilot new renewable technologies in public housing. Through the use of clean energy, HA is working to make Hong Kong's public housing more sustainable.

    Grid-connected photovoltaic systems 1

    Grid-connected photovoltaic systems

    For existing PRH estates, HA completed the first trial project of flexible PV system at Kwai Shing West Estate at the end of 2021. Afterwards, it is planned to install flexible solar PV systems at about 25 existing PRH estates progressively by the first quarter of 2024.

    Grid-connected flexible photovoltaic systems 1

    Grid-connected flexible photovoltaic systems