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Save through Energy Efficiency

By Salman Tariq


Energy efficiency is one of the smartest investment that households and businesses can undertake to minimize energy costs. It is the most under-appreciated measure as consumers generally think of drastic steps like investment in alternate sources of power or even sacrificing energy usage through conservation. It is important, first, to understand what energy efficiency is and how its different from energy conservation.

Energy efficiency entails doing the same amount of work using less resources  while energy conservation is doing less amount of work  thereby using less resources.

Example: You want to watch 3 hours of TV everyday (90 hours in a month) and you have an old 20inch CRT TV that consumes 90watts of power. 3 hours of watching TV will cost you 270 watt hours of power (90w x 3h = 270wh).

Energy efficiency: a 20inch LED TV takes 24watts of power. Now watching TV for 3 hours would consume 72 watt hours (24w x 3). For the same amount of work (3 hours of TV) you used less resources (198 watt hours less).

Energy Conservation means watching 0.8 hours or 48 minutes of TV (less amount of work) in order to use less resources (72watt hours rather than 270 watt hours).



Work (output)

Input (watt hours)

Cost (PKR)

Assuming 20rs/kwh

Old Appliance

3 hours of TV everyday


90 hours every month

270 wh/day



8100 wh/month

Rs. 5.4 /day



162rs/month

Energy Efficient Appliance

3 hours of TV everyday


90 hours every month

72wh/day



2,160 wh/month

1.44rs/day



43rs/month

Energy Conservation

(with old appliance)

0.8 hours of TV everyday


24 hours every month

72wh/day



2,160 wh/month

1.44rs/day



43rs/month


In that way, the priority for cutting energy cost is the following:

  1. Energy Efficiency
  2. Alternate source of power like solar
  3. Energy Conservation

Energy efficiency has to be the first step when thinking about cutting energy costs. The paybacks on most energy efficiency are lower than any investment in clean energy generation. We use a plethora of appliances such as lights, TV, washing machines, fans and ACs. The following measures can be taken:

    1. Lights - using LED lights as it saves 40% compared to CFLs.
    2. Sensor Lights: Lighting sensors can save a lot of power in commercial buildings and offices - these sensors switch off or adjust down wattage based on room occupancy or natural lighting
      1. Fans - using the new energy saver ceiling fans which save 50% compared to the traditional fans.
        1. Inverter ACs - Inverter ACs, when used properly, can save 50% compared to normal ACs
          1. DC Motors - energy efficient DC motors use 50% less compared to normal motors

            There are other measures that can have a drastic impact on energy costs. Heat insulation using protective glass sheets or roof insulation can block heat and reduce the temperature inside a building which in turn saves on cooling costs.

            These energy efficiency measures when combined can save 30-40% on power costs without investing in alternative technology. The ideal combination would be converting your facility into an energy efficient home alongside solar installation on rooftop. The solar power system will ensure cheap electricity production and also insulates the roof which helps in reducing cooling costs.



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