Section B: Case study – (compulsory) [50 MARKS] Refer to the following article and answer the questions that follow: Wright, C.Y., Mathee, A., Kapwata, T. and Street, R., 2024. The impact of rolling blackouts on environmental health in South Africa. Journal of Health and Pollution, 14(1), pp. 1–12. Available at: University of Pretoria Research Repository [Accessed 10 October 2026]. doi:10.1289/JHP1090. Question 4 Question 4 [18] The article highlights the need for more sustainable and resilient energy solutions to address the long-term consequences of load shedding in South Africa. Recommend and justify a range of energy-efficient and sustainable options that South African households could use to meet their energy needs while reducing pollution, managing costs and supporting sustainable development. In your answer, evaluate the advantages of renewable energy, energy-efficient technologies and responsible energy-use practices, taking into account the different financial circumstances of households. (9 x 2 marks) T

Here are nine energy-efficient and sustainable options for South African households, along with their justifications:

1. Solar Photovoltaic (PV) Systems (Grid-tied/Hybrid)

   • Recommendation: Install rooftop solar PV systems, potentially with battery storage for hybrid systems.
   • Justification: Solar PV provides a clean, renewable energy source, significantly reducing reliance on the national grid during load shedding and lowering electricity bills. It directly reduces carbon emissions from fossil fuel-based electricity generation, supporting environmental sustainability. While the initial investment can be substantial, decreasing panel costs, financing options, and government incentives (where available) are making it more accessible. Smaller, grid-tied systems can offer immediate savings for moderate-income households, while larger hybrid systems provide greater energy independence for those with higher financial capacity.

2. Solar Water Heaters (SWHs)

   • Recommendation: Replace conventional electric geysers with solar water heaters (SWHs).
   • Justification: Water heating is a major electricity consumer in households. SWHs use free solar energy to heat water, drastically cutting electricity consumption and associated costs, thereby managing household expenses. They provide hot water even during load shedding, enhancing energy resilience. This reduces the demand for grid electricity, lowering pollution from power plants. SWHs generally have a lower upfront cost than full PV systems, making them a more financially accessible renewable energy option for a wider range of households.

3. Energy-Efficient Lighting (LEDs)

   • Recommendation: Transition from incandescent and compact fluorescent (CFL) bulbs to Light Emitting Diode (LED) lighting throughout the home.
   • Justification: LEDs consume significantly less electricity (up to 80-90% less than incandescent bulbs) and have a much longer lifespan. This leads to immediate and substantial savings on electricity bills, directly managing costs. By reducing overall electricity demand, it lessens the strain on the grid during load shedding and contributes to lower carbon emissions. The low upfront cost of LED bulbs makes this an accessible and impactful energy-efficient technology for households across all financial circumstances.

4. Efficient Appliances

   • Recommendation: Prioritize purchasing and using energy-efficient appliances (e.g., refrigerators, washing machines, induction cooktops) with high energy ratings.
   • Justification: Modern, energy-rated appliances consume considerably less electricity than older models, leading to significant long-term cost savings on utility bills. This reduces the household's energy footprint, contributing to lower pollution and supporting sustainable development. While the initial investment for highly efficient appliances might be higher, the operational savings quickly offset this, making them a wise long-term investment for households able to afford the initial outlay, with entry-level efficient models available for more budget-conscious consumers.

5. Improved Home Insulation and Passive Design

   • Recommendation: Invest in proper roof and wall insulation, draught-proofing, and consider passive solar design principles for new builds or renovations.
   • Justification: Effective insulation reduces heat transfer, minimizing the need for artificial heating and cooling, which are major energy consumers. This leads to substantial energy savings, lower electricity bills, and reduced reliance on the grid during peak demand or load shedding. By decreasing energy consumption, it lowers associated pollution. This is a one-time investment with long-term benefits, improving comfort and sustainability. The scope of insulation can be tailored to different financial capacities, from simple draught-proofing to comprehensive retrofits.

6. Responsible Energy-Use Practices (Behavioral Changes)

   • Recommendation: Implement simple behavioral changes such as switching off lights and appliances when not in use, unplugging chargers, and maximizing the use of natural light and ventilation.
   • Justification: These practices require no financial investment and immediately reduce electricity consumption, directly managing costs. They lessen the overall energy demand on the grid, helping to mitigate the impact of load shedding and reducing pollution from power generation. This fosters an energy-conscious culture, promoting sustainable development through mindful resource use, and is universally accessible to all households regardless of income.

7. Smart Energy Management Systems/Monitoring

   • Recommendation: Utilize smart plugs, timers, and energy monitoring devices to track and control electricity consumption.
   • Justification: These technologies allow households to identify "energy vampires," schedule appliance use during off-peak hours (if applicable), and gain insights into their energy consumption patterns. This empowers informed decision-making to reduce waste, optimize usage, and lower electricity bills. By managing demand more effectively, it contributes to grid stability during load shedding and reduces overall energy consumption, thereby lowering pollution. The initial cost is moderate, offering a good return on investment for households seeking to actively manage their energy use.

8. Efficient Cooking Methods

   • Recommendation: Transition from electric resistance stoves to more efficient alternatives like induction cooktops or LPG (liquefied petroleum gas) stoves.
   • Justification: Electric resistance stoves are energy-intensive. Induction cooktops are highly energy-efficient, heating food directly and quickly, leading to significant electricity savings and reduced reliance on the grid. LPG stoves offer an alternative energy source, providing cooking capabilities independent of grid electricity during load shedding. Both options reduce the household's electricity demand, contributing to lower bills and reduced pollution. While induction cooktops require an initial investment, LPG offers a flexible, pay-as-you-go option, catering to different financial circumstances.

9. Community-Based Energy Solutions/Microgrids

   • Recommendation: Explore and participate in community-level initiatives such as shared solar installations or microgrids, particularly for housing complexes or lower-income communities.
   • Justification: Pooled resources can make larger, more efficient renewable energy projects feasible, distributing costs and benefits among multiple households. This can provide more resilient and affordable energy access, reducing individual financial burden and offering a collective solution to load shedding. It promotes sustainable development through shared infrastructure and local energy generation, reducing reliance on centralized, often polluting, power sources. This approach can make renewable energy accessible to households that cannot afford individual installations.