Sustainable Energy

Sustainable energy definition

Being more sustainable is becoming ever more important, as our population increases, and the effects of Climate Change worsen. Let's firstly understand the meaning of sustainability.

Sustainable energy is therefore finding methods of energy supply and consumption that help to make sure that current and future demands are met, ensure energy security for the future, and also reduce the effects on the environment. This can involve methods to conserve energy and reduce waste, finding ways to use fossil fuels more efficiently, reducing the demand for energy, and moving to more renewable energy resources.

Sustainable energy use

With our vastly growing global population, energy demand is only going to increase, as more people require energy supplies around the world. Non-renewable energy sources are not only bad for the environment, but are also not going to last forever. They are finite. It may also be a long time until renewable energy resources become our main source of energy, as we have been using non-renewable resources for so long, that the switch would be costly and timely. Non-renewable resources still take up a large percentage of the energy we use globally. Figure 1 shows that coal, oil, and gas are still the major sources of global energy consumption. This means that sustainable energy use needs to increase, to help meet the global demand, supply future generations, and reduce environmental damage.

Fig. 1 - graph showing global energy consumption

One of the methods of being more sustainable is the move to renewable energy resources. We will discuss this more later on; however, it is important to remember, that sustainable energy isn't exactly the same as renewable energy. Let's try to understand the difference.

Sustainable energy vs renewable energy

Sustainable energy is energy supply and consumption that reduces damage to the environment and preserves energy resources for current and future generations. Renewable energy is a little different; these are energy sources that won't run out, such as solar power, or wind power. Many methods of renewable energy also happen to be sustainable and vice versa. However, sustainable energy can include non-renewable energy sources, that are used in a more efficient way to be conserved for the future.

Types of sustainable energy

Sustainable methods of energy production and consumption are going to become increasingly important to ensure supplies for future generations and to protect the environment. Let's have a look at the different types of sustainable energy.

Conserving energy

Conserving energy or reducing waste energy is important for being more sustainable. This can mean making more personal sustainable choices or designing homes and workplaces to reduce waste energy. Some of these methods include:

• Homes or offices that have more energy-efficient appliances
• Insulation (this stops the loss or gain of heat, with materials such as foam)
• Solar power or green electricity
• Personal choices e.g., recycling, reducing food miles
• Transport - reducing air travel, electric cars

Reducing energy demand

Demand for energy is high around the world. This is a result of rising populations, increased industrial growth in countries like India and China, and improved standards of living around the world.

Higher demand means that the supply needs to increase. If there is reduced demand, more energy can be saved. Government schemes or grants can help to reduce energy demand, by providing incentives or support to be more energy-efficient.

Education is also an important factor; increasing awareness about energy use may make people change their energy-using habits. Smart electricity meters may also have a similar effect; a smart meter can tell you exactly how much energy you are using. This means people are more aware of their energy use and may be more likely to try to reduce their consumption. In London, a fee must be paid to drive into certain central zones of the city. This is known as a congestion charge. Congestion charges can decrease the reliance on unsustainable methods of transport, discourages the use of cars, and favours public transport methods.

Fossil fuel efficiency

Sustainability is all about making sure future generations are secure. As non-renewable energy is finite, methods to make these resources last longer are essential.

Vehicle efficiency

Vehicles are being designed so that they are more energy-efficient, by reducing fuel usage (or even cutting it to zero). This can be exampled by hybrid or electric cars. Make sure you take a look at the Energy Conservation explanation, as it provides much more detail on energy-efficient transport, such as car efficiency and alternative transport.

Carbon capture

Carbon capture is the method of storing carbon dioxide. During the energy production process, carbon dioxide is captured instead of being released into the atmosphere and then moved to a storage space, usually underground. This means fossil fuels can still be used, but with reduced emissions. However, many environmentalists say that this is not a solution to Climate Change, as emissions are still being released.

Fig. 2 - Protesting against carbon capture, Matt Hrkac, CC-BY-2.0Wikimedia Commons

Combined heat and power

The combination of heat and power can also be called cogeneration. During energy production (using fossil fuels), heat waste occurs. With cogeneration technology, this heat can be captured and used for power, such as heating, cooling or lighting. Cogeneration is very efficient and helps to reduce energy waste.

Renewable energy sources

Renewable energy sources can also be sustainable. As non-renewable energy resources start to deplete, renewable energy sources are going to become increasingly important to ensure energy supply in the future. Renewable energy is also significantly better for the planet. Some examples of renewable energy sources are:

• Wind power
• Solar power
• Hydroelectric
• Geothermal
• Biomass

Sustainable energy examples

Case studies and examples are super important in geography. Throughout this article, we have used examples of sustainable energy methods in more developed countries, such as the UK or Germany. Don't forget to use these in your exam answers and compare them to lower-income countries! Let's take a look at an example of sustainable energy in a low-income country.

Renewable energy programme in Bangladesh

Energy supply is unequal across the globe, with some people suffering from the Impact of Energy Insecurity. In many developing or low-income countries, the energy supply is low, in comparison to much of the developed world. As lower-income countries begin to develop further and increase their access to energy supplies, it is critical to find ways to be more sustainable, instead of increasing the use of fossil fuels. There needs to be a balance between increasing energy supplies for developing countries, as well as ensuring sustainability.