Wasting energy

The lack of efficiency in the energy cycle

Cheap and abundant fossil fuels have cemented bad energy habits, especially in rich countries. Most of our methods of producing, distributing and using energy are massively inefficient.

These inefficiencies run across all production and use of energy, from the power plants to our everyday use of cars, heating and cooling systems, air travel and stand-by power.

Power plants

Power plants typically only turn about 30% of the energy input into usable electricity.

We are losing up to 75 % of the energy in the fuel at the start of the process. Energy companies could do much better – combining power and heat production can lift efficiency to over 70%.

But power producers insist on working to old models – the production of large quantities of energy in one plant far from where people live. Many of the new plants that are proposed now will remain below 40% efficiency – but power producers still try to persuade us that this is good. Is wasting 60% really what we need?

• More on the impact of coal-fired power stations

Cars

An average car emits approximately 3 times its weight in CO2 per year*.

And it is typically used to take ONE person to work and back – exceeding the weight of an 80 kg person 37.5 times. Of course, light-weight solutions exist which minimise fuel use. Check the proposals from Rocky Mountain Institute. 

* A car with a fuel consumption of around 7.8 litres/100 km (36 miles per gallon) travelling 16,000 km (10,000 miles) per year emits almost 3 tonnes (6,500 lbs) of CO₂ per year.

Heating and cooling

These systems are some of the biggest culprits when it comes to wasting energy.

How often have you seen the windows open in a house that was overheated? The equivalent exists in the tropics where people cool their places down to 20°C and then open the windows because they are freezing.

Construction can help in a big way – near-to-zero energy homes and offices are possible at an economic scale. But it is also personal habit. Even simple things like choosing to wear a sweater rather than turning up the heating can help.

Flying

Airlines and their industry have been hit by rising oil prices.

The industry is aware of the danger this poses to its profitability and is seeking to develop more efficient planes which can travel further. However, the fact is that flying is inefficient in principle, resulting in much higher energy use and much higher CO₂ emissions than any other form of travel. The best advice is simply not to fly – travel by other means wherever possible.