Energy Usage Tips | CEM - Companhia de Electricidade de Macau

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Energy Saving and Safety

Energy Usage Tips

Energy Efficiency Label

At Home

Efficient use of electricity not only lowers your electricity bill, but also helps to maintain your electrical appliances and preserve the environment. Here are some tips for you to save energy and money without sacrificing comfort or convenience.

Living Room & Bedroom

Kitchen

Bathroom & Utility Room

Living Room & Bedroom

Kitchen

Bathroom & Utility Room

At Office

Safety Tips

	Electric Water Heater Take showers instead of baths to save up to 50% of energy. Set thermostat at a lower temperature to shorten heating time if only a small amount of hot water is needed.
	Washing & Drying Machines Only use washing and drying machines with a full load. Use cold water for both washing and rinsing. Clean lint filters after each load to keep machines efficient.
	Electric Iron Iron large batches of clothing at one time for energy efficiency. Switch off irons and use residual heat to finish items that require careful treatment, e.g. silky items.
	Vacuum Cleaner Choose a model that is practical and suitable for floors or carpets at home. An all-purpose model using a lot of power may not be the best choice. Clean or replace dust bags regularly to keep appliances in good condition.

	Illumination Replace T12 or T10 fluorescent tubes with T8 or T5 energy efficient fluorescent tubes which are 10% to 30% more energy efficient. Replace incandescent light bulbs with LED light bulbs which are 90% more energy efficient. Install dimmers and lighting zone controls wherever possible to adjust brightness of or turn off the light in unoccupied areas. Install parabolic-type lighting reflectors to reflect sufficient light with fewer fluorescent tubes.
	Office Equipment Select energy-efficient office equipment, e.g. photocopiers and laser printers that bear energy labels. Always switch off office equipment when they are not in use during non-office hours.
	Water Heating Use heat pumps, high-efficiency electric water heaters and boilers. Keep hot water pipes as short as possible.
	Heating, Ventilating & Air-Conditioning (HVAC) System Replace ageing HVAC equipment with new energy-efficient equipment. Set room temperatures to standard optimum temperature 24°C or 25°C. When outside conditions are suitable and the outdoor air is cool and dry enough, the outdoor air intake should be increased. Maintain cooling efficiency by regularly cleaning condenser tubes, cooling coils and air filters.
	Building Envelope Install self-closing doors to non-air-conditioned spaces to reduce excessive infiltration and exfiltration. Install caulking or replace worn caulking around windows, doors or other infiltration or exfiltration areas. Install outdoor shading devices, add reflective film to windows and close interior shades such as curtains or blinds (preferably light colored) to reduce solar heat in summer.
	Other Machinery & Equipment Adhere to the maintenance schedules recommended by manufacturers. Reduce the numbers of lifts or escalators in service during non-office hours.

	Illumination Replace T12 or T10 fluorescent tubes with T8 or T5 energy efficient fluorescent tubes which are 10% to 30% more energy efficient. Replace incandescent light bulbs with LED light bulbs which are 90% more energy efficient. Install dimmers and lighting zone controls wherever possible to adjust brightness of or turn off the light in unoccupied areas. Install parabolic-type lighting reflectors to reflect sufficient light with fewer fluorescent tubes.
	Office Equipment Select energy-efficient office equipment, e.g. photocopiers and laser printers that bear energy labels. Always switch off office equipment when they are not in use during non-office hours.
	Water Heating Use heat pumps, high-efficiency electric water heaters and boilers. Keep hot water pipes as short as possible.
	Heating, Ventilating & Air-Conditioning (HVAC) System Replace ageing HVAC equipment with new energy-efficient equipment. Set room temperatures to standard optimum temperature 24°C or 25°C. When outside conditions are suitable and the outdoor air is cool and dry enough, the outdoor air intake should be increased. Maintain cooling efficiency by regularly cleaning condenser tubes, cooling coils and air filters.
	Building Envelope Install self-closing doors to non-air-conditioned spaces to reduce excessive infiltration and exfiltration. Install caulking or replace worn caulking around windows, doors or other infiltration or exfiltration areas. Install outdoor shading devices, add reflective film to windows and close interior shades such as curtains or blinds (preferably light colored) to reduce solar heat in summer.
	Other Machinery & Equipment Adhere to the maintenance schedules recommended by manufacturers. Reduce the numbers of lifts or escalators in service during non-office hours.

	Main Switch Check regularly to see that the main switch is in good condition. Label "ON" and "OFF" clearly. Be easy to reach without obstructions in an emergency.
	Residual Current Devices (RCDs) Use RCDs to protect yourself from electric shock. They can automatically disconnect the electricity supply if an earth fault or a current leakage develops. They are especially important to be installed in kitchens, bathrooms and places where water is present. Test RCDs according to the manufacturer’s instructions regularly by pressing the button marked "T" or "Test".
	Circuit Breakers / Fuses Choose correct rating and type. Label each circuit breaker or fuse to indicate which circuit it protects. Always replace the blown fuse the proper rating. Don’t substitute it with an object, such as a coin or paper clip. Know how to switch on/off circuit breakers safely. The circuit breaker trips off repeatedly when the appliance is plugged, there could be a fault on that circuit and you should seek assistance from an experienced electrician.
	Socket Outlets Replace any broken or missing outlets and wall plates. Place safety caps in all unused outlets that are accessible to children. Do not use extension socket when the appliances exceed the maximum current rating.
	Plugs Choose a square 3-pin 13 amp plug that complies with safety requirements and standards. Check the plugs for signs of damage or discoloration. Plugs should fit securely into outlets, don’t force a plug into an outlet if it doesn’t fit.
	Cords Make sure cords are in good condition – no part of the cable is worn, split, cracked or frayed. Use electrical cords properly. Insert or remove plugs by grasping themselves instead of the cords. Don’t run electrical cords underneath carpets, rugs or furniture, near hot appliances or expose them to corrosive materials. When using a detachable cord, always unplug the appliance from socket outlet before detaching the cord from appliance.
	Lighting Arrange regular check for damaged fittings, cords and connections. Don’t use bulbs that have higher wattage than the recommended size of fixture. Ensure outdoor lighting fittings and luminaries are weatherproof. Don’t touch energized light bulbs to avoid burns.
	Appliances Use appliances that meet local / international statutory safety requirement. Make sure appliances or equipment are in good condition with regular cleaning and maintenance. Never cover up ventilation holes or slots on appliances. Don’t touch any appliances, socket outlets or switches if hands are wet. Don’t reach into water to retrieve an appliance without unplugging it first. Allow sufficient clear space around an appliance for heat dissipation and keep it away from direct sunlight. Check appliances by an experienced electrician if they are in wet, constantly blow fuses, feel a tingle when touching, have a burning smell or sizzling sound coming from an appliance, or flickering lights. Switch off electrical items that are not in regular use at the plug to ensure that when we are away from the house for any length of time to reduce fire risk and waste energy if left on standby.
	Safety for Children When appliances are not in use, switch off the power and unplug. Close unused power points with plastic plug-in covers. Make sure electrical cords are not dangling from benches or within your child’s reach. Use power boards with inbuilt safety switches when plugs are unavoidably within your child’s reach. Don’t permit your child to touch electrical cords. Explain the dangers of electricity and teach your child safety measures including how to use electrical appliances safely.

	Main Switch Check regularly to see that the main switch is in good condition. Label "ON" and "OFF" clearly. Be easy to reach without obstructions in an emergency.
	Residual Current Devices (RCDs) Use RCDs to protect yourself from electric shock. They can automatically disconnect the electricity supply if an earth fault or a current leakage develops. They are especially important to be installed in kitchens, bathrooms and places where water is present. Test RCDs according to the manufacturer’s instructions regularly by pressing the button marked "T" or "Test".
	Circuit Breakers / Fuses Choose correct rating and type. Label each circuit breaker or fuse to indicate which circuit it protects. Always replace the blown fuse the proper rating. Don’t substitute it with an object, such as a coin or paper clip. Know how to switch on/off circuit breakers safely. The circuit breaker trips off repeatedly when the appliance is plugged, there could be a fault on that circuit and you should seek assistance from an experienced electrician.
	Socket Outlets Replace any broken or missing outlets and wall plates. Place safety caps in all unused outlets that are accessible to children. Do not use extension socket when the appliances exceed the maximum current rating.
	Plugs Choose a square 3-pin 13 amp plug that complies with safety requirements and standards. Check the plugs for signs of damage or discoloration. Plugs should fit securely into outlets, don’t force a plug into an outlet if it doesn’t fit.
	Cords Make sure cords are in good condition – no part of the cable is worn, split, cracked or frayed. Use electrical cords properly. Insert or remove plugs by grasping themselves instead of the cords. Don’t run electrical cords underneath carpets, rugs or furniture, near hot appliances or expose them to corrosive materials. When using a detachable cord, always unplug the appliance from socket outlet before detaching the cord from appliance.
	Lighting Arrange regular check for damaged fittings, cords and connections. Don’t use bulbs that have higher wattage than the recommended size of fixture. Ensure outdoor lighting fittings and luminaries are weatherproof. Don’t touch energized light bulbs to avoid burns.
	Appliances Use appliances that meet local / international statutory safety requirement. Make sure appliances or equipment are in good condition with regular cleaning and maintenance. Never cover up ventilation holes or slots on appliances. Don’t touch any appliances, socket outlets or switches if hands are wet. Don’t reach into water to retrieve an appliance without unplugging it first. Allow sufficient clear space around an appliance for heat dissipation and keep it away from direct sunlight. Check appliances by an experienced electrician if they are in wet, constantly blow fuses, feel a tingle when touching, have a burning smell or sizzling sound coming from an appliance, or flickering lights. Switch off electrical items that are not in regular use at the plug to ensure that when we are away from the house for any length of time to reduce fire risk and waste energy if left on standby.
	Safety for Children When appliances are not in use, switch off the power and unplug. Close unused power points with plastic plug-in covers. Make sure electrical cords are not dangling from benches or within your child’s reach. Use power boards with inbuilt safety switches when plugs are unavoidably within your child’s reach. Don’t permit your child to touch electrical cords. Explain the dangers of electricity and teach your child safety measures including how to use electrical appliances safely.