Sustainable Energy Management and Local Schemes

Sustainability means managing demand as well as supply

A sustainable energy supply meets people's needs today without preventing future generations from meeting theirs. This involves more than choosing a renewable fuel: energy must also be affordable, reliable, environmentally responsible and manageable by the people using it.

Increasing supply is one approach, but reducing the amount of energy needed is equally important. When homes, workplaces and transport use less energy, pressure on energy resources falls. If this reduces fossil fuel burning, it also reduces greenhouse gas emissions.

An individual's carbon footprint includes emissions from heating, electricity and travel, as well as those associated with producing and transporting the things they buy. Buying fewer unnecessary goods, switching off unused appliances and walking instead of driving can therefore reduce both energy demand and emissions.

Conservation and efficiency work in different ways

Energy conservation means avoiding unnecessary energy use. Switching off lights in an empty room conserves energy because lighting is no longer being demanded.

Energy efficiency means obtaining the same useful service with less energy. An efficient appliance performs its task while using less electricity. Both approaches can reduce bills and emissions, but efficiency allows people to retain a service rather than simply use it less.

Smart meters make energy use more visible, helping households identify opportunities to cut consumption. However, information alone does not guarantee a reduction: people must be able and willing to change their behaviour.

Designing homes and workplaces to need less energy

Insulation slows the loss of heat from a building. A well-insulated home therefore needs less heating to maintain a comfortable temperature. The same principle applies to offices and other workplaces, where savings can be substantial because buildings may be large and used for long periods.

Energy-efficient appliances reduce electricity demand, while switching off unnecessary lighting and equipment avoids waste. Solar panels can provide renewable electricity on site. They change the source of the energy supplied rather than necessarily reducing the amount used.

Building regulations can require efficient designs in new buildings. Grants or tax incentives can help households and businesses pay for improvements such as insulation or solar panels. These measures can produce lasting savings, but installation costs are a barrier, especially for people with limited incomes. Improving existing buildings is also more difficult than incorporating efficient design during construction.

Making transport more sustainable

Walking and cycling avoid the fuel needed for a car journey. Safe cycle lanes make cycling a more practical choice, while investment in public transport helps people travel without relying on individual cars. Car sharing allows several people to use one vehicle rather than making separate journeys.

These measures work best when alternatives are convenient and accessible. A frequent bus service may attract commuters, whereas an infrequent service is less useful to someone travelling to work at a fixed time. Rural communities may have fewer alternatives than urban residents.

More efficient engines and aerodynamic vehicle designs reduce the fuel required for travel. Hybrid vehicles combine an engine with electric power, while electric vehicles avoid burning petrol or diesel during use. Their wider environmental benefit depends partly on how their electricity is generated: changing the vehicle does not remove the need for sustainable electricity supplies.

Using fossil fuels more efficiently

In a conventional power station, some of the energy released from fuel becomes heat that is not used. Combined heat and power (CHP) puts this heat to work, for example by heating nearby homes and businesses alongside generating electricity. More useful energy is obtained from the fuel, reducing the need to burn additional fuel for heating elsewhere.

CHP is particularly useful where there is a nearby demand for heat. It is less useful if potential users are too far away or do not need much heating. It also still uses fuel: greater efficiency does not make a fossil fuel renewable.

Carbon capture and storage tackles a different problem. It captures carbon dioxide from fossil fuel use and stores it underground, reducing the amount released into the atmosphere. This is an emissions-reduction measure, not the same as conserving energy or obtaining more useful output from each unit of fuel.

Overall, conservation and efficiency can reduce demand while renewable energy supplies more of the remaining need. Combining these approaches is stronger than relying on any one measure alone.

Chambamontera: a local renewable energy scheme in Peru

Chambamontera, on the eastern slopes of the Andes in northern Peru, provides an example of a local renewable energy scheme in a newly emerging economy. Its scattered population largely depends on subsistence farming, including coffee growing. Steep terrain and difficult access make extending the electricity grid expensive and impractical.

The same landscape creates an opportunity: rivers and streams, high rainfall and steep slopes provide suitable conditions for micro-hydro power. Practical Action helped the community develop a small scheme using flowing water to generate electricity locally.

The project cost US$51,000 to establish and run. Funding came from the government, Japanese investment and the local community. Households each contributed US$750, using a credit scheme to spread the cost. This shows that even a relatively small scheme can require outside support and finance.

How the micro-hydro scheme works

Local people helped dig a canal and build a forebay, a small basin that holds water before it enters the penstock. The penstock carries water down a steep slope. Water leaving it turns a turbine, and the turbine drives a generator that produces electricity for the community.

This is a run-of-the-river scheme: it diverts flowing water rather than storing it behind a large dam in a reservoir. Water is a renewable resource, and electricity generation does not require burning fossil fuels. However, the scheme depends on a suitable flow of water and enough height difference to drive the turbine.

Why the scheme supports sustainable development

Electricity has helped create opportunities for businesses, including coffee processing and furniture making. Powered machinery allows more processing to take place locally, supporting jobs and incomes.

Electric lighting lets children study after dark and helps schools use computers and other equipment. Health centres can refrigerate vaccines, communicate by radio and use electrical equipment. These benefits show how access to energy can improve services as well as household comfort.

Replacing kerosene lamps improves indoor air quality and reduces fire risks. Less reliance on fuelwood also reduces pressure on trees, helping limit deforestation and soil erosion. Unlike large hydroelectric reservoirs, the scheme does not require widespread flooding of land.

Local involvement is central to its sustainability. People helped build the scheme, and community management and appropriate technology support local maintenance. Participation also helps ensure that the project serves local priorities rather than imposing an unsuitable solution.

Chambamontera demonstrates that small-scale renewable energy can be effective where extending a national grid is impractical. Its strengths are local benefits, renewable generation and limited large-scale environmental disruption. Its limits include the initial cost, maintenance needs and dependence on suitable rivers and slopes. It is therefore a strong local solution, not a model that can be copied successfully everywhere.

Reducing demand

• Conservation: avoid unnecessary energy use.
• Efficiency: provide the same service with less energy.
• Individual choices: switch off unused equipment, walk or cycle, buy fewer unnecessary goods.
• Homes and workplaces: insulation, efficient appliances, smart meters and efficient building design.
• Transport: public transport, cycling facilities, car sharing and more efficient vehicles.

Evaluate the methods

• Lower demand can reduce bills, fossil fuel use and carbon footprints.
• Installation costs and access to alternatives can limit uptake.
• CHP: uses heat from electricity generation to heat nearby buildings; still consumes fuel.
• Carbon capture and storage: reduces carbon dioxide emissions, rather than conserving energy.
• Best approach: reduce demand and provide the remaining energy more sustainably.

Chambamontera, northern Peru

• Eastern Andes: scattered settlements and steep terrain make grid extension difficult.
• High rainfall, streams and steep slopes suit micro-hydro.
• Practical Action supported the scheme; cost US$51,000, with US$750 per household contributed through credit.
• Canal → forebay → penstock → turbine → generator.