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New public management (NPM) has transformed the public sector auditing context, although in quite different ways. Further, investigations into NPM’s impact on public sector auditors and audit institutions have been largely unconnected, with the exception of the critical examination of performance audits. We investigate the question of how public sector auditors’ roles and activities have changed as a result of NPM and later reforms.

We examine and synthesise public sector audit research examining reforms since the year 2000. The research presented considers changes to external and internal public sector audits as well as the development of public sector audit institutions – known as supreme audit institutions (SAIs).

Considerable changes have occurred. Many were influenced by NPM, but others have evolved from the eco-system of accounting, auditing and public sector management. External auditors have responded to an increase in demand for accountability. Additional management and governance techniques have been introduced from the private sector, such as internal auditing and audit committees. NPM has also led to conflicting trends, particularly when governments introduced competition to public sector auditing by contracting out but then chose to centralise to improve accountability. There is also greater international influence now through bodies like the International Organisation of Supreme Audit Institutions (INTOSAI) and similar regional bodies.

NPM reforms and the eco-system have impacted public sector auditing. Sustainability reporting is emerging as an area requiring more auditing attention; auditors also need to continue to develop better ways to communicate with citizens. Further, research into auditing in non-Western nations and emerging technologies is also required, especially where it provides learnings around more valuable audit practices. Empirical evidence is required of the strengths and weaknesses of SAIs’ structural variety.

This study aims to evaluate the key risk factors inherent in public–private partnership (PPP) power projects in Ghana and further determine the critical risk factors affecting both the public and private sectors in PPP power projects.

Ranking-type Delphi survey in two rounds was conducted to establish a comprehensive list of critical risk factors of PPP. Purposive and snowball sampling techniques helped obtain experts for the Delphi survey. Mean score ranking, factor analysis, Cronbach α coefficient and Kendall’s concordance were used for analysis. The probability of occurrence and severity of each risk factor were computed to obtain the risk impact.

From the list of 67 risks, 37 risk factors were deemed to be critical. The five topmost risk factors were: delay payment on contract, private investor change, political risks, fluctuating demand of power generated and public opposition. Principal component analysis grouped the risk factors into seven major themes.

This study develops an authoritative risk factor list for PPP power projects, which reflects both sector and country conditions for prioritizing and mitigating risk factors. Delphi approach adopted in this study can be used by future studies in similar environments where PPP is novel and expert respondents scarce.

Demand for private investment in infrastructure, notably in the power sector remains high, and this is anticipated to expand with the passage of time. Very little research currently exists on the power sector and specifically the private sector influencing factors (PSIFs) for entering into public–private partnerships (PPPs). The purpose of this study is to explore influencing factors for private sector participation in PPP power projects in Ghana.

Using purposive and snowball sampling techniques, questionnaires were used to gather responses from experts in the PPP power sector domain in a two-round Delphi survey. Reliability analysis was conducted using Cronbach’s alpha coefficient and level of agreement tested using Kendall’s concordance. Mean score ranking, analysis of variance (ANOVA) and Chi-square test were the main analysis conducted on the influencing factors.

The most significant PSIFs were: obtaining of investment support; improvement in private sector’s international image; synergy with public sector; sharing of risks; and gaining of profits. From ANOVA results, all the influencing factors had no significant different perception between the number of years in PPP practice and the motivations for the private sector entering into PPP power projects. Using Chi-square, the association between the variables indicated they were statistically significant.

The findings in this study are significant for multinational power generation firms that seek to enter the Ghanaian energy sector to help fill the generation gap and deficit.

The output of this research contributes to the checklist of influencing factors for private sector participation in PPP power projects and enhances the development of PPP practice.