MIXED-METHODS RESEARCH IN ELECTRICITY REGULATION

1. Introduction

Mixed-methods research in electricity regulation is an interdisciplinary research approach that combines quantitative and qualitative methods to examine electricity markets, regulatory institutions, tariffs, reliability, consumer protection, environmental impacts, and energy-transition policies. Electricity regulation cannot always be understood through legal doctrine alone because regulatory decisions frequently depend on technical, economic, environmental, and social evidence.

Quantitative research may examine electricity prices, demand, generation capacity, outage frequency, emissions, investment returns, or tariff data. Qualitative research can analyse legislation, regulatory decisions, judicial judgments, stakeholder interviews, consultation submissions, institutional practices, and consumer experiences. Mixed methods integrate these forms of evidence to provide a more comprehensive regulatory assessment.

2. Quantitative Methods

The quantitative component uses measurable information and statistical techniques. Electricity researchers may analyse:

historical electricity tariffs and price increases;

generation and demand statistics;

reliability indicators and outage duration;

renewable-energy penetration;

utility costs and revenues;

household electricity affordability; and

carbon emissions from generation.

Econometric models can additionally investigate relationships between regulatory interventions and market outcomes. For example, researchers might compare electricity prices before and after market restructuring or assess whether particular tariff methodologies adequately recover efficient utility costs.

3. Qualitative Methods

The qualitative component investigates the institutional and legal meaning behind numerical outcomes. It may involve case-law analysis, statutory interpretation, regulatory-document analysis, interviews, stakeholder consultations and comparative legal research.

For example, increasing tariffs may be quantitatively demonstrated through pricing data. Qualitative analysis can then investigate why the regulator authorised those increases, which statutory considerations were applied, whether consumers participated meaningfully, and whether the decision complied with administrative-law requirements.

Thus, mixed methods connect “what happened” with “why it happened.”

4. Integration of Methods

Integration is the defining feature of mixed-methods research. Researchers may first analyse market data and subsequently conduct interviews explaining unusual results. Alternatively, qualitative research may identify a regulatory problem that is later tested quantitatively.

A particularly valuable approach in electricity regulation is triangulation. Researchers compare legislation, regulatory decisions, statistical evidence, technical reports, stakeholder submissions, and judicial findings. Agreement between different sources strengthens findings, while disagreement identifies areas requiring further investigation.

5. Case Law: National Energy Regulator of South Africa v PG Group (Pty) Ltd

Case Name/Citation: National Energy Regulator of South Africa and Another v PG Group (Pty) Limited and Others [2019] ZACC 28.

Facts: The dispute concerned NERSA's methodology for determining municipal electricity tariffs and whether the regulator properly applied the statutory framework governing tariff approvals.

Legal Issue: The central question concerned whether NERSA's tariff decisions were lawful and rational within the regulatory framework.

Judgment: The Constitutional Court considered the relationship between the regulator's statutory powers, tariff methodology and administrative decision-making.

Legal Principle/Ratio Decidendi: Electricity tariff regulation must remain connected to the statutory purpose and legally relevant considerations. Regulatory methodology cannot substitute for lawful exercise of statutory discretion.

Significance: The case demonstrates why mixed-method research is valuable. Tariff disputes require simultaneous examination of legal authority, regulatory methodology, financial calculations and economic evidence. Purely doctrinal research may therefore provide only part of the regulatory picture.

6. Case Law: Earthlife Africa Johannesburg v Minister of Environmental Affairs

Case Name/Citation: Earthlife Africa Johannesburg v Minister of Environmental Affairs and Others (65662/16) [2017] ZAGPPHC 58.

Facts: The case concerned environmental authorisation for the proposed Thabametsi coal-fired power station. Earthlife argued that the project's climate-change impacts had not been adequately investigated before authorisation.

Legal Issue: Whether climate-change impacts constituted relevant considerations that had to be properly assessed in the environmental decision-making process.

Judgment: The High Court found that relevant climate impacts had been insufficiently considered and remitted the relevant ground of appeal for reconsideration, requiring consideration of a climate-change impact assessment and public comments.

Legal Principle/Ratio Decidendi: Administrative energy-related decisions must be based on adequate consideration of material and legally relevant evidence.

Significance: The judgment illustrates mixed-method reasoning particularly well. Determining legality required combining environmental legislation with emissions estimates, climate science, water-resource evidence, technical assessments and stakeholder participation. The subsequent assessment examined matters including lifecycle emissions and climate resilience.

7. Advantages and Limitations

Mixed methods provide greater evidentiary depth, enable cross-validation of findings, and reveal relationships between legal rules and real-world electricity outcomes. They are particularly valuable for studying tariff justice, energy poverty, renewable integration, market competition, grid reliability and regulatory effectiveness.

However, difficulties include incompatible datasets, limited regulatory transparency, methodological complexity, interview bias, resource requirements, and challenges in combining legal reasoning with statistical conclusions.

8. Conclusion

Mixed-methods research offers a powerful framework for electricity-regulation scholarship because electricity governance is simultaneously legal, economic, technical, environmental and social. By combining doctrinal legal analysis with quantitative evidence and qualitative investigation, researchers can evaluate not merely what regulatory rules formally require, but how those rules operate in practice. Case law demonstrates that sound electricity governance increasingly depends upon regulators considering reliable, relevant and multidimensional evidence before exercising statutory powers.