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What are the spots?carbon dioxide emissionsfuel costs They show the relative Cost Savings and Reduced CO2 emissions.

Each Year
Each Year
Each Year
dishwasher energy saving tips Dishwashers
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30kWh -
£4.62 -

11.01kg -

Run the machine full and less often

boil less water in kettle energy saving tips Boiling Water
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82kWh -
£12.628 -

30.09kg -

Boil only what you need. Savings depend on how much tea you drink!

fridge freezer energy saving tips Fridge Freezers
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50kWh -
£7.7 -

18.35kg -

Fridge maintenance. Savings depend on size, age and rating

dmoney saving tips tumble drying Tumble Dryers
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90kWh -
£13.86 -

33.03kg -

Operate Less often, clean filters, part dry clothes?

differnce in cost of shallow or deep bath Baths
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700kWh -
£30.1 -

147kg -

Have shallower baths and consider how you heat water

change energy supplier to save money Change Supplier
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0kWh -
£0 -

0 -

save money and have a beerSwitch! This is the single simplest way of saving money. This is equivalent to 100 pints of beer!

shower or power shower which is cheaper Shower of Power Shower
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120kWh -
£18.48 -

25.2kg -

Aviod immersion heated power showers

save money and energy with good loft insulation Install Loft Insulation
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3000kWh -
£129 -

630kg -

Modern loft insulation in a 3 bed semi - these numbers are for Gas, savings are greater for other fuels

save money and energy with good loft insulation Improve Loft Insulation
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1000kWh -
£43 -

210kg -

Modern loft insulation in a 3 bed semi - these numbers are for Gas, savings are greater for other fuels

This table is under construction there are more tips here.

Measures to reduce fuel bills: ROI* is the time it takes in years to return the investment in fuel savings for an average gas heated 3 bed semi-detached house.
Measure ROI*
hot water tank insulation save energy save money Lagging 1 Year
loft insulation energy saving Loft Insulation 2 Years
cavity wall insulation energy saving Cavity Wall Insulation 2.3 Years
underfloor insulation energy saving Underfloor Insulation 4.4 Years
solid wall insulation energy saving Solid Wall Insulation 15.8 Years
double glazing energy saving Double Glazing 58.1 Years
Renewable Energy Measures ROI** is the time it takes in years to return the investment in energy. The table assumes no government incentive schemes are used (FIT or RHI).
Measure ROI**
solar hot water energy saving costs Solar Hot Water 11 to 62 Years
ground source heat pump investment costs Heat Pumps 4 to 81 Years
domestic wind power costs Wind Power 16 to 32 Years
solar PV costs and investment Solar Photovoltaics 13 ± 3 Years

What is a kWh, What is a TWh?

Last Updated on Saturday, 25 March 2017 22:58

First What is a Watt?

A Watt (W) is 1 joule per second (j/s), it is a unit of power and a joule is a unit of energy, so if you have a 1W device running for 1 hour, then it consumes 1 Wh of energy .....

An electric heater might have a power rating of 1 kW so if you leave it on for 1 hour it will use 1kWh of energy, 2 hours then 2kWh. The k here stands for kilo (1000) and the unit most normally used is kWh (1 kWh is 1 kilowatt hour and is often called 1 unit). The units are not confined to electricity, you can relatively easily calculate for example that 1kg of propane contains 13.9 kWh of chemical energy, which will be released upon combustion. It is useful to do this to compare different sources of energy with electricity.

A Watt, by the way, is named after a Scottish bloke called Watt, who lived log before all the climate change stuff, so lets blame him for all of this since he can do little about it if we do and he did help with the industrial revolution.

What about kWh, MWh, GWh and TWH? Well these are just orders if magnitude of energy, k is kilo, M is mega, G is Giga and T is Tera.

  • 1 kiloWatt -1000 Wh
  • 1 megaWatt - 1,000,000 Wh
  • 1 gigaWatt - 1,000,000,000 Wh
  • 1 teraWatt - 1,000,000,000,000 Wh

Now can we have some perspective please? What do these numbers mean?

Examples of 1 Wh
typical led light 1Wh

A modern LED light in your house required about 5W to power it, so if you leave it on for 12 minutes it will consume 1 Wh of energy.

Examples of 1 kWh

Thing like fan heaters require between 1 and 3 kW to power them, so if you leave it on for an hour it will have consumed between 1 an 3 kWh, depending on the setting you have the heater on.

Examples of 1 MWh
energy consumption of a high speed train

A high-speed electrical train is a good example here. On average they consume about 25 kWh (0.025 MWh) of energy for every kilometer they travel, so for 1 MWh of energy the train can travel 40 km. It is about 400 km from Newcastle upon Tyne to London, so the train would require about 10 MWh of energy.

Examples of 1 GWh
energy consumption of scotland

Since Watt was Scottish lets look at Scotland. The total electrical energy consumption of Scotland in 2012 was about 25,000 GWh, divide that by 365 in a year and we get 68.5 GWh per day and then by 24 hours in a day, 2.85 GWh. So to give you and idea of a GWh, Electrical energy requirement in Scotland is about 1 GWh every 20 minutes on average.

Examples of 1 TWh

Again using Scotland it has a population a little over 5 million and requires 25 TWh of electrical energy each year.

Now here is the real big number. Total energy demand in the world in 2015, this includes all sources of energy, electrical energy and burning fuels directly was 160000 TWh. This equates to 21700 kWh per person on average given that in 2015 there were about 7,350,000,000 people, With the USA using 88000 kWh per person and Africa on average 7000 kWh per person.



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