Saving Energy

Why Save Energy?

A large portion of Hong Kong's electricity and gas supplies come from non-renewable fossil fuels, such as coal and oil. Burning fossil fuels produces air pollutants and greenhouse gases. By conserving energy and using it more efficiently, we will waste less, pollute less and reduce the impact on an already overstressed environment.


Energy Saving for All

What You Can Do

You do not have to reduce your standard of living when reducing your energy consumption – you only have to think a little about how you can use them more wisely.


There are simple ways to reduce energy use in lighting without having to grope in the dark.

  • Switch lighting on only when you need it.
  • Use daylight whenever possible.
  • When buying new lighting, should be consider to replace incandescent lamps with more efficient lamps (e.g. Light Emitting Diode (LED) lamps).
  • Appropriately place your lighting where you need with suitable brightness.
  • Better choose a light coloured, high-reflectivity decoration scheme to enhance the penetration of the light intensity into the room.
  • Use non-opaque, light-coloured lamp shades.
  • Keep light fixtures and lamps clean to maximise their efficiency.

Air Conditioning

Air conditioning is another major form of energy consumption in your home, but there are ways in which you can use it more wisely.

  • When buying an air-conditioner, check its Energy Efficiency Ratio, with lower numbers denoting better efficiency.
  • Avoid installing air-conditioners where they will be exposed to direct sunlight.
  • Close off areas that do not require air-conditioning, and turn air-conditioners off in unoccupied rooms.
  • Keep windows and doors shut when the air-conditioner is running.
  • Place weather strips on doors and windows to prevent the leakage of cool air.
  • Clean or replace the filters in all air-conditioners at the beginning of summer, and clean them every two weeks from then on.
  • Set the temperature to an energy-efficient level so that you will feel comfortable rather than cold.
  • Use fans instead of air-conditioning whenever possible.


When cooking and heating water with gas, there are a few simple tips that can help you save energy.

  • Choose a cooker or oven of a suitable size for your family needs.
  • A multi-jet cooker or oven offers you more flexibility, and can minimise wastage.
  • Adjust the flame to fit the bottom of your pan.
  • Cook several dishes in one session when using an oven.
  • Use the simmer burner rather than the oven to reheat food.
  • Use your grill to its full capacity rather than cooking one item at a time.
  • Always put the lids on pans to trap heat.
  • Boil only as much water as you need.
  • Steaming and stir-frying is an energy-efficient way of cooking.
  • Turn your oven or ring off before you have finished cooking, and let the remaining heat gently finish the job.
  • Check your oven door seal for heat leakage, and replace it if necessary.

Water Heating

  • If you take a shower instead of a bath you will save about 50% in heating costs.
  • A low-flow shower head also saves water and heating energy.
  • Only use hot water when necessary.
  • When not using your water heater, switch off the pilot light.
  • Have your water heater inspected from time to time as recommended on the unit's label to ensure its efficiency and safety.

Water Use and Energy Savings

You can also reduce energy use in other ways when using water. Just remember that energy is used to transport, store and treat all water in Hong Kong.

More on saving water tips
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Last revision date: April 2021
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