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Kempsey Primary School

To learn with respect and belief; to challenge, create and dream!


Look at how much energy our solar panels have produced:


In 2016 we produced over 9500 kilwatt hour (kWh) and in 2017 over 8500 kWh.

So what exactly is a kilowatt hour?

A kilowatt hour (kWh) is a measure of how much energy you’re using.

It doesn’t mean the number of kilowatts you’re using per hour. It is simply a unit of measurement that equals the amount of energy you would use if you kept a 1,000 watt appliance running for an hour.

So if you switched on a 100 watt light bulb, it would take 10 hours to rack up 1 kWh of energy.

What else takes around 1 kilowatt hour?


Here are some rough examples of 1 kWh:


  • Using a 10,000 watt electric shower for six minutes
  • Keeping an immersion heater (3,000 watts) on for 20 minutes
  • Cooking in a 2,000 watt oven for half an hour
  • An hour’s ironing with a 1,000 watt iron or 45 minutes with a 1,500 watt iron
  • Less than an hour using a dishwasher (1,000 - 1,500 watts)
  • Around three hours watching a plasma TV (280 - 450 watts)
  • Keeping a fridge-freezer (200 - 400 watts) on for about three hours
  • Keeping an electric blanket (130 - 200 watts) on all night
  • Using a laptop (20 - 50 watts) all day
  • Keeping a broadband router (7 - 10 watts) on for five days


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