A power purchase agreement is a long-term contract to buy electricity from a generator at agreed terms.
For an institution, signing one is a multi-year allocation of capital that carries price, volume, counterparty and regulatory risk — not just a technical choice.
Why a PPA's risks are financial and commercial
When CFOs, boards and investment committees look at a power purchase agreement, the early focus tends to fall on generation technology, specifications and yield. But because a PPA is a binding obligation to buy electricity over many years, the real exposure is commercial and financial rather than technical. Across the life of the contract the off-taker absorbs price risk against prevailing grid rates, volume risk as generation output varies, counterparty credit risk, and the risk of changing regulation. If market conditions, tariff structures or statutory rules shift during the term, an unexamined commitment can squeeze institutional cash flow and lock up balance-sheet flexibility for years.
Regulatory-authorisation risk
The first risk to examine is whether every party and activity in the supply chain is properly authorised. Under the Electricity Regulation Act 4 of 2006, generation, transmission, distribution, trading and the import or export of electricity must each be authorised by a licence or, where provided, registration, with the National Energy Regulator as custodian and enforcer. NERSA, the independent regulator established under the National Energy Regulator Act 40 of 2004, makes those licensing decisions across electricity, piped gas and petroleum pipelines.
If an off-taker contracts with a generator or intermediary that lacks the required licence or registration, the whole arrangement is exposed to statutory invalidity, regulatory enforcement or abrupt termination — so confirming the counterparties' authorisations is foundational due diligence, not a formality.
Tariff and price risk
A PPA's viability depends on how it interacts with regulated tariffs and the distribution network. NERSA regulates tariffs and pricing across the supply chain through formal decisions, consultation papers and public hearings, so contract pricing cannot be judged in isolation from the regulated utility rates and network use-of-system charges the regulator approves. Where supply runs over local grid infrastructure, the Electricity Regulation Amendment Act 28 of 2007 is directly relevant — it added a chapter governing electricity reticulation by municipalities, alongside new definitions and extended ministerial regulation-making powers.
Because municipal reticulation tariffs and network rules are subject to municipal oversight and NERSA approval, the PPA must spell out exactly how a change in regulated charges or municipal reticulation tariffs passes through between buyer and seller, so neither party is surprised.
NERSA, the independent regulator established under the National Energy Regulator Act 40 of 2004, makes those licensing decisions across electricity, piped gas and petroleum pipelines.
— Synthesis of South African regulatory guidance
Procurement and public-finance risk for public buyers
Where the off-taker is a public institution or state enterprise, commercial risk is layered on top of strict public-finance rules. Under the PFMA, as administered by National Treasury, the PPA is public expenditure and must meet the Section 217 standard — fair, equitable, transparent, competitive and cost-effective — and the accounting officer's duty to run internal controls and prevent and disclose irregular and fruitless and wasteful expenditure applies in full. Because a long-term PPA involves extended commitments and possibly guarantees, it also engages Chapter 8 of the PFMA, which regulates public borrowing and financial commitments and makes unapproved commitments unlawful.
A defective procurement makes the expenditure irregular, and the Auditor-General South Africa (AGSA) can escalate non-compliance or a breach of duty that causes significant financial loss to a material irregularity.
The commercial risk allocation to examine
To protect the balance sheet, an investment committee has to scrutinise how the contract actually allocates risk. It should test the term against the institution's strategic horizon, so that a long offtake obligation stays manageable as needs change; define volume clearly, distinguishing firm capacity from variable output; set availability standards, performance remedies and explicit termination triggers so the institution can exit or be compensated if the generator underdelivers; divide the impact of future statutory or regulatory change through a clear change-in-law clause; and test counterparty creditworthiness, so the generator or trader can actually sustain the contract over its life. Each of these belongs in the contract, allocated explicitly, before signature.
What good looks like
Good is a unified approach that joins legal compliance, regulatory intelligence and hard financial analysis. The board confirms that every counterparty holds the licences or registrations the Electricity Regulation Act 4 of 2006 and its 2007 amendment require. The financial model is built on NERSA's published decisions and approved tariff methodologies, with realistic pass-through assumptions for municipal reticulation charges.
For a public buyer, the accounting officer makes sure the procurement meets the PFMA, National Treasury's rules and the Section 217 standard, heading off irregular expenditure and an AGSA material-irregularity finding. Grounded in the statutory rules and a clear risk allocation, a long-term energy contract protects institutional capital, keeps the institution compliant, and secures durable energy economics.
Related insights
- Electricity wheeling in South Africa: commercial questions for institutional buyers
- Utility revenue assurance: understanding technical and non-technical revenue losses
- Electricity market reform: the institutional strategy and finance agenda
Sources
- Electricity Regulation Act 4 of 2006 — South African Government
- Electricity Regulation Amendment Act 28 of 2007 — South African Government
- National Energy Regulator of South Africa (NERSA) — National Energy Regulator of South Africa
- Public Finance Management Act: legislation overview — National Treasury
- What we do: irregular expenditure and material irregularities — Auditor-General South Africa
Frequently Asked Questions
What is a Power Purchase Agreement (PPA)?
A Power Purchase Agreement (PPA) is a long-term contract where an institution agrees to buy electricity from a generator under specified terms. For an institution, signing a PPA represents a multi-year capital allocation, exposing it to various financial and commercial risks beyond just technical considerations.
Who is affected by the regulatory requirements surrounding Power Purchase Agreements in South Africa?
All parties involved in the electricity supply chain, including generators, transmitters, distributors, and traders, are subject to licensing or registration requirements under the Electricity Regulation Act 4 of 2006, enforced by NERSA. Public institutions and state enterprises, as off-takers, must also comply with the Public Finance Management Act (PFMA) and National Treasury's rules for procurement and financial commitments.
What are the primary risks decision-makers should consider when entering into a PPA?
Decision-makers must primarily consider commercial and financial risks, including price risk against prevailing grid rates, volume risk from generation output variations, and counterparty credit risk. The risk of changing regulation is also significant, as shifts in market conditions or statutory rules can severely impact cash flow and balance-sheet flexibility over the PPA's term.
What does effective compliance with PPA regulations entail, and what are the consequences of non-compliance?
Effective compliance involves a unified approach integrating legal, regulatory, and financial analysis, ensuring all counterparties hold required licences under the Electricity Regulation Act. For public buyers, it means adhering to the PFMA and Section 217 standards for procurement. Failure can lead to statutory invalidity, regulatory enforcement, or abrupt termination of the PPA, and for public entities, an Auditor-General South Africa finding of irregular expenditure or a material irregularity.
Where do organisations commonly make errors when dealing with Power Purchase Agreements?
Organisations often err by focusing primarily on the technical aspects of generation technology and yield, overlooking the significant commercial and financial exposures inherent in a PPA. A common mistake is failing to conduct foundational due diligence to confirm that all counterparties hold the necessary licences or registrations, exposing the arrangement to statutory invalidity or termination.