UNDERSTANDING AND MANAGING RESIDENTIAL SOLAR ROOFTOP PV

The document examines the challenges South African municipalities face as residential rooftop solar PV adoption grows, specifically focusing on the loss of revenue used to cross-subsidize low-income households. It highlights a significant lack of system registration, with an estimated 75% of households failing to inform municipalities of their installations. The paper argues that appropriate tariff design and transparent communication are essential to balance the interests of prosumers and utilities. To support this, the authors introduce a simulation-based electricity decision-making tool developed by Stellenbosch University to help policymakers visualize the complex interactions between tariffs, consumer behavior, and grid stability.

• A vast majority of residential rooftop PV installations in South Africa are not registered with municipalities, which creates technical and safety risks, such as live wires endangering technicians and grid overloading in clustered installations.
• The adoption of rooftop PV by affluent, high-electricity users erodes the municipal revenue used to subsidize free basic electricity for indigent households, potentially turning the inclining block tariff into a regressive mechanism.
• Municipalities face a financial mismatch where the reduction in revenue from electricity sales is not matched by an equal reduction in costs, as fixed charges and grid management expenses remain or increase.
• The business case for rooftop PV is primarily driven by the falling cost of technology, rising electricity prices, and the ability to avoid high active energy charges, which often incentivizes non-registration to achieve a higher effective net-metering rate.
• In the City of Cape Town, a 2018 by-law threatening disconnection and a fee of R6,426 for unregistered systems led to increased registrations, yet an estimated 50% of systems in the city remain unregistered.
• A computerised electricity decision-making tool is being developed by the Centre for Renewable and Sustainable Energy Studies (CRSES) at Stellenbosch University to simulate the impact of policy decisions and tariffs on financial viability, system stability, and greenhouse gas emissions over a 20-year period.

APA

Kritzinger, K., Scholtz, L., & Korsten, N. (2020). UNDERSTANDING AND MANAGING RESIDENTIAL SOLAR ROOFTOP PV. WWF South Africa. https://wwfafrica.awsassets.panda.org/downloads/understanding_and_managing_rooftop_solar_pv.pdf

Chicago

Kritzinger, Karin, Louise Scholtz, and Nikkie Korsten. UNDERSTANDING AND MANAGING RESIDENTIAL SOLAR ROOFTOP PV. WWF South Africa, 2020. https://wwfafrica.awsassets.panda.org/downloads/understanding_and_managing_rooftop_solar_pv.pdf.

Wikipedia

{{cite report |last1=Kritzinger |first1=Karin |last2=Scholtz |first2=Louise |last3=Korsten |first3=Nikkie |title=UNDERSTANDING AND MANAGING RESIDENTIAL SOLAR ROOFTOP PV |publisher=WWF South Africa |date=August 2020 |url=https://wwfafrica.awsassets.panda.org/downloads/understanding_and_managing_rooftop_solar_pv.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{kritzinger2020understanding, author = {Kritzinger, Karin and Scholtz, Louise and Korsten, Nikkie}, title = {{UNDERSTANDING AND MANAGING RESIDENTIAL SOLAR ROOFTOP PV}}, institution = {WWF South Africa}, year = {2020}, month = aug, url = {https://wwfafrica.awsassets.panda.org/downloads/understanding_and_managing_rooftop_solar_pv.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }