Sustainable Energy Solutions Revision Notes | GCSE AQA Higher Geography
The Dharnai solar microgrid is a local renewable energy scheme in Bihar, India, installed in 2014 with funding from Greenpeace India. 11 questions answered.
Updated 23 Mar 2026 · Revise Right Team
Sustainable Energy Solutions is part of Section C: The challenge of resource management in GCSE AQA Higher Geography.
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What this lesson covers
The Dharnai solar microgrid is a local renewable energy scheme in Bihar, India, installed in 2014 with funding from Greenpeace India. 11 questions answered.
Describe the features of a named local renewable energy scheme in an LIC or NEE
Explain how the scheme provides sustainable energy supplies to local communities
Assess the social, economic, and environmental impacts of the scheme
Apply case study evidence to exam questions using named places, data, and geographical terminology
Key ideas to keep in view
Use this lesson to stay inside Section C: The challenge of resource management while connecting the detail back to the wider Challenges in the human environment topic.
Renewable energy: Energy from sources that are naturally replenished and will not run out, such as solar, wind, or hydroelectric power. Used when discussing sustainable alternatives to fossil fuels.
Sustainable energy supply: Energy provision that meets current needs without compromising the ability of future generations to meet their own needs. Relevant in LIC and NEE contexts where demand is growing rapidly.
LIC / NEE: Low Income Country (LIC) or Newly Emerging Economy (NEE) — nations where energy demand is rising but infrastructure and investment may be limited. Sustainable local schemes can be especially significant here.
Energy mix: The combination of different energy sources used to meet a country or region's total energy demand. A diverse mix reduces dependence on any single source.
Revision notes
Read the core explanations from Sustainable Energy Solutions before testing yourself from memory.
1. Why Sustainable Energy Matters in LICs and NEEs
Millions of people in low income countries and newly emerging economies still lack reliable access to electricity. Without it, hospitals cannot run equipment, children cannot study after dark, and businesses cannot grow. The question is not just how to generate more energy — it is how to do so in a way that lasts.
Fossil fuels can generate power quickly, but they are expensive to import, produce carbon emissions, and will eventually run out. Renewable energy schemes — especially small-scale, locally managed ones — offer a different path. They can be built close to the communities that need them, using resources that are freely available in the local environment.
The AQA specification asks you to know one named example of a local renewable energy scheme in an LIC or NEE. The Dharnai solar microgrid in Bihar, India, is a well-documented case that covers the key themes you need: energy access, community impact, and sustainability.
2. Case Study — Dharnai Solar Microgrid, Bihar, India
India is classified as a newly emerging economy (NEE). Despite rapid economic growth nationally, rural areas in states such as Bihar have historically suffered from poor energy infrastructure. Dharnai, a village of approximately 2,400 people, had been without electricity for around 30 years before the scheme was established. [VERIFY]
In 2014, Greenpeace India partnered with local organisations to install a solar-powered microgrid in Dharnai. The system used photovoltaic (PV) solar panels to generate electricity, which was stored in batteries and distributed through a local grid to homes, shops, and a health centre. The scheme was designed to be community-managed, with local people trained to operate and maintain the equipment.
Location: Dharnai village, Bihar state, north-east India (NEE)
Year established: 2014
Energy source: Solar photovoltaic (PV) panels
Capacity: Approximately 100 kilowatts (kW) [VERIFY exact figure]
Beneficiaries: Around 2,400 residents across roughly 450 households [VERIFY]
Management: Community-run, with local trained operators
The scheme is a strong example of a local renewable solution because it was not connected to the national grid at the point of installation. It generated, stored, and distributed power entirely within the village — making it genuinely self-sufficient in energy terms.
3. Social, Economic, and Environmental Impacts
Exam questions on case studies often ask you to assess impacts across three dimensions: social, economic, and environmental. Here is how Dharnai performs across all three — and where the picture is more complicated.
Impact Type
Positive
Limitation or Challenge
Social
Children could study after dark; health centre gained reliable power; reduced reliance on kerosene lamps (which cause indoor air pollution and fire risk)
Some households initially could not afford the connection fee; benefits were uneven across the community [VERIFY exact fee structure]
Economic
Local shops and small businesses could operate longer hours; local people were employed to manage and maintain the system; reduced household spending on kerosene
Initial installation costs were high and required external funding from Greenpeace; long-term financial sustainability of the community-run model is uncertain [VERIFY]
Environmental
Solar energy produces no carbon emissions during operation; no local air pollution compared to diesel generators or kerosene; uses a freely available renewable resource (sunlight)
Manufacturing and disposing of solar panels and batteries has an environmental cost; land use for panels may compete with other uses [VERIFY local land-use data]
Notice that each impact category has both positives and limitations. This balance is exactly what examiners want to see in an 'assess' or 'evaluate' question. A top-band answer does not list benefits — it weighs them against drawbacks and reaches a judgement.
4. How the Scheme Provides Sustainable Energy Supplies
Sustainability in energy supply means more than just using a renewable source. It also means the scheme can keep running over time — socially, economically, and environmentally. Dharnai was designed with this in mind.
Worked example: How a Solar Microgrid Provides Sustainable Energy: Process Chain
Trace the process by which the Dharnai solar microgrid delivers sustainable energy to the community.
Photovoltaic (PV) panels on rooftops and open land absorb sunlight and convert it directly into direct current (DC) electricity. — Solar radiation is the trigger. Bihar receives strong sunlight for much of the year, making solar PV a well-matched technology for this location.
DC electricity is stored in a battery bank, allowing power to be available at night or during cloudy periods. — Storage is what makes the scheme reliable rather than intermittent — a key requirement for sustainable supply.
An inverter converts DC to alternating current (AC), which is then distributed through cables to connected homes, shops, and the health centre. — The local grid means no dependence on the national infrastructure, which was unreliable or absent in this area.
Trained local operators monitor the system, collect small usage fees, and carry out routine maintenance. — Community ownership is central to long-term sustainability — the scheme does not collapse if external funding ends, because local people have the skills and financial model to keep it running.
Households receive reliable electricity; the community reinvests usage fees into maintenance; the energy source (sunlight) is permanently available. — This meets the definition of sustainable supply: current needs are met without depleting resources or creating dependency that undermines future provision.
Answer: Sunlight is captured by PV panels → stored in batteries → converted and distributed locally → managed by trained community members → generating a self-sustaining energy supply that does not depend on fossil fuels or external infrastructure.
5. Exam Technique — Answering Case Study Questions on Sustainable Energy
Now that you know the case study, the next step is making sure your exam answers actually earn the marks. The most common reason students lose marks on case study questions is not that they lack knowledge — it is that they present it without structure or judgement.
Worked example: How to Answer: 'Assess the extent to which a local renewable energy scheme provides sustainable energy supplies' [9 marks]
Using a named example of a local renewable energy scheme in an LIC or NEE, assess the extent to which it provides sustainable energy supplies. [9 marks]
Name the scheme, location, country classification, energy source, and date: 'The Dharnai solar microgrid, Bihar, India (NEE), installed in 2014, uses solar PV panels to supply approximately 2,400 residents.' — Examiners award marks for named, located, and dated evidence. A vague opener such as 'a solar scheme in India' will not access the higher levels of the mark scheme.
Explain one or two ways the scheme is sustainable: 'Solar energy is renewable and produces no carbon emissions during operation. Community management means the scheme can continue without external funding, as local operators collect usage fees to cover maintenance costs.' — Use the word 'because' to link your point to a geographical reason. This is what separates an explanation from a description.
Identify a genuine limitation: 'However, the scheme's sustainability is limited by the high upfront cost of solar panels and battery storage, which required external funding from Greenpeace India. If the battery bank fails and replacement costs cannot be met locally, supply would be disrupted.' — A balanced answer is essential for Level 3. The word 'however' signals to the examiner that you are evaluating, not just describing.
Consider social or economic sustainability: 'Not all households could initially afford the connection fee, meaning the poorest residents — those most in need — may have been excluded. This raises questions about whether the scheme is socially sustainable as well as technically renewable.' — Sustainability is not only about the energy source. Social and economic dimensions count, and raising them shows geographical thinking.
'Overall, the Dharnai scheme provides a largely sustainable energy supply in technical and environmental terms, because it uses a permanent renewable resource and is community-managed. However, its long-term social and economic sustainability depends on whether all residents can access and afford it. To a large extent, it is sustainable, but continued monitoring and support are needed to ensure benefits reach the most vulnerable.' — The conclusion must directly answer the question. Use 'overall', 'to a large extent', or 'on balance' to signal your judgement. Do not introduce new evidence here — summarise and judge.
Answer: A top-band response names the scheme with location and date, explains sustainability with geographical reasons, evaluates limitations with evidence, and ends with a clear, supported judgement using 'overall' or 'to a large extent'.
The Dharnai case study covers everything the specification requires: it is a named local renewable energy scheme in an NEE, it demonstrates how sustainable energy supplies can be provided at community scale, and it offers genuine material for evaluating social, economic, and environmental impacts. Knowing this case study in depth — with its location, date, energy source, and specific impacts — gives you the evidence base to answer any question on this topic at the highest level.
Sources and content standards
Published by Revise Right. Use the official specification reference to check the requirements for your course. Content updated: 2026-03-23.
An inverter converts the direct current (DC) electricity produced by solar panels and stored in batteries into alternating current (AC), which is then distributed through cables to homes, shops and the health centre. In Dharnai, this local grid meant no dependence on unreliable national infrastructure.
What is a local renewable energy scheme?
A local renewable energy scheme is a small- to medium-scale project that generates energy from renewable sources such as solar, wind or micro-hydro to serve a specific community or region, rather than feeding a national grid. It is especially valuable in rural areas of LICs and NEEs where grid connection is costly or unavailable.
What is the Dharnai solar microgrid?
The Dharnai solar microgrid is a local renewable energy scheme in a village in Bihar, India, an NEE, installed in 2014 with external funding from Greenpeace India. Photovoltaic panels generated electricity that was stored in batteries and distributed through a local grid to homes, shops and a health centre, with local people trained to run it.
How does a solar microgrid work?
Photovoltaic panels convert sunlight into direct current (DC) electricity, which is stored in a battery bank so power is available at night or in cloudy periods. An inverter converts it to alternating current (AC), which is sent through local cables to homes, and trained community operators maintain the system using small usage fees.
What were the impacts of the Dharnai solar scheme?
Socially, the Dharnai solar scheme let children study after dark and gave the health centre reliable power, while local people were trained to operate and maintain it. Environmentally, solar produces no carbon emissions during operation. However, some households could not afford the connection fee and the scheme needed external funding.
Why is renewable energy important for LICs and NEEs?
Millions of people in LICs and NEEs lack reliable electricity, so hospitals cannot run equipment, children cannot study after dark and businesses cannot grow. Fossil fuels are expensive to import, produce carbon emissions and will run out, whereas small, locally managed renewable schemes can be built close to communities using freely available resources.
How long was Dharnai without electricity?
Dharnai, a village of approximately 2,400 people in Bihar, India, had been without electricity for around 30 years before the solar microgrid was established. Rural areas in states such as Bihar have historically suffered from poor energy infrastructure despite India's rapid national growth.
Why is community management important for energy schemes?
Community management is central to long-term sustainability because trained local operators monitor the system, collect small usage fees and carry out maintenance. The scheme does not collapse if external funding ends, because local people have the skills and financial model to keep it running.
Is the Dharnai solar scheme sustainable?
The Dharnai scheme is largely sustainable in technical and environmental terms, because it uses a permanent renewable resource and is community-managed. Its social and economic sustainability depends on more, as high upfront costs needed external funding, a failed battery bank could disrupt supply and the poorest residents may not afford the connection fee.
Why is solar power suited to Bihar?
Solar power is suited to Bihar because the state receives strong sunlight for much of the year, making solar PV a well-matched technology for that location. Battery storage means power is available at night or during cloudy periods.
Why are fossil fuels unsuitable for rural LICs?
Fossil fuels can generate power quickly, but they are expensive to import, produce carbon emissions and will eventually run out. Small-scale, locally managed renewable schemes can be built close to communities using resources freely available in the local environment, where grid connection is costly or unavailable.