How can I save electricity?

Residential

Residential

Do It Yourself Home Makeover

Do It Yourself Home Makeover

The first step towards increasing your home’s energy efficiency and comfort is to conduct a whole-house energy audit.

Did you know that regular household electricity use can be reduced with simple energy efficiency upgrades even before occupants make changes to how they use electricity?

The first step towards increasing your home’s energy efficiency and comfort is to conduct a whole-house energy audit. A walkthrough tour of your home with a checklist to record your notes will help you determine how well your home currently operates and what upgrades are needed to improve its energy performance.

Once you assess what needs to be done, this guide will help you with the second step—determining which upgrades to implement. The calculation section will help you estimate your consumption and the payback section will help you prioritise your upgrades.

You can maximise your savings by doing your own Powerwise Home Makeover. Let’s get started:

 

How to complete your home energy audit

Completing your home energy audit is easy and takes just 10 minutes. Read the questions in the ‘What do you do at home?’ column and tick off your answers in the YES or NO arrow boxes. If you answer NO, follow the advice in the ‘What can you do to save energy’ column. Everyone in your home can help to save energy. If you live with family members, it is a great idea to do this audit together—the more they participate, the more likely they will be to help save.

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Tick off your answers to each question or skip questions that are not applicable. When you’re finished, you will have a handy action checklist to follow.

 

1. Check and improve your Lighting electricity consumption

Lighting accounts for up to 15% of all electrical energy usage, and so it is not surprising that lighting has attracted a lot of attention in the drive to reduce energy consumption.

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2. Check and improve your air conditioners (ACs) electricity consumption

Residents in Abu Dhabi can spend up to 65% of their total electricity usage on air conditioning (AC), especially during the hot and humid summer months. AC should be your first and biggest target for saving electricity.

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3. Improve your home's insulation and air-tightness

The more the sun heats your home, or air flows in and out, the more electricity you spend on AC.

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4. Check your Appliances

Your home's energy consuming appliances add to your electricity bill. Simple changes to how you use and maintain these can reduce your consumption.

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Do you want to calculate your electricity consumption and how much it costs you?

Every electrical appliance draws a certain amount of electrical power while operating which is measured in Watts (W). You can often find how much electricity it uses on a label on the appliance itself. Multiplying that by the number of hours (h) you use it for results in how much total electrical energy it consumes which is measured in Watt-hour (Wh).

Please note that some items or appliances use the same amount of electricity constantly such as light bulbs. Others use more electricity at some times and less at others such as ACs. When the AC compressor and condenser is on (when the AC is cooling), they use the most electricity; and when there are off, they use much less, just using the fan to circulate air. Water heaters and refrigerators also operate in similar cycles, heating or cooling for a period, then cycles, then heating or cooling again.

The following equations are intended to help you estimate how much electricity any item or appliance consumes. For those items that use different amounts of electricity at different times, use their maximum wattage and the number of hours per day you estimate that they are running at their full wattage, not when they are cycling or using less energy.

 

Calculation procedure

1. Daily energy consumption (kWh)
    Find the daily energy consumption using the following formula:
    (Wattage × Hours Used Per Day) ÷ 1000 = Daily Kilowatt-hour (kWh) consumption

2. Yearly energy consumption (kWh)
    Find the annual energy consumption using the following formula:
    Daily kWh consumption × number of days used per year = annual energy consumption

3. Yearly cost of use (AED)
    Find the annual cost to run the appliance using the following formula:
    Annual energy consumption × rate per kWh* = annual cost to run appliance

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Payback periods

Payback is an estimate of how long it will take to save enough energy to pay for the cost of a conservation measure. A payback calculation will help you decide which upgrades to prioritise. We recommend doing those improvements first that cost the least and save the most energy.

For example, a 10,000 AED investment which returns 5000 AED per year in savings would have a two-year payback period (The time value of money is not taken into account for simplicity).

Simple payback can be calculated as below:

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