Power Purchase Agreements (PPA) for Solar in Singapore, Explained

A Power Purchase Agreement (PPA) is a contract where a third party owns and maintains a solar system installed on your property, and you pay only for the electricity it actually generates, at an agreed rate per kWh, rather than buying the system outright. It is a well-established financing structure in Singapore's solar sector, though its relevance to an individual landed home specifically is considerably narrower than to public and commercial-scale solar deployments.

How does a PPA actually work?

A PPA provider designs, installs, owns, and maintains the solar system at no upfront cost to the property owner, then charges for electricity generated and consumed, at a rate typically set below the prevailing grid tariff, over a long-term contract commonly running 15 to 25 years. The property owner benefits from lower electricity costs without upfront capital outlay or ownership responsibilities, while the provider earns a return over the contract term. It's structurally closer to a long-term electricity supply arrangement than to a purchase, which is the framing worth keeping in mind when comparing it against buying a system outright.

Where is the PPA model actually used in Singapore?

PPAs are well established in Singapore's public and commercial solar sector, most visibly through the SolarNova programme, which uses this structure to deploy solar across government buildings and HDB blocks at scale. This large-scale, institutional context is where the PPA model has the clearest, most established track record in Singapore.

How big is SolarNova, and what does that tell a homeowner about PPA maturity in Singapore?

SolarNova, jointly led by HDB and EDB since 2014, has grown into one of the larger rooftop solar procurement programmes in the region: HDB alone has committed roughly 455 MWp of solar capacity across its estates, enough to power an estimated 114,000 four-room flats, deployed through a series of tenders spanning thousands of HDB blocks and hundreds of government agency sites. The most recent major tender awarded a single provider up to 200 MWp of additional capacity, a scale far beyond anything a private residential market segment could plausibly generate on its own.

For a homeowner, the practical takeaway isn't the scale itself, it's what that scale confirms: the PPA structure is well-tested and contractually mature in Singapore at the institutional level, with over a decade of track record. What hasn't scaled down to the same degree is its use for individual landed homes, where the economics of a single rooftop system don't attract the same institutional financing interest as a multi-hundred-block aggregated tender.

What happens to a PPA contract if I sell my home before it ends?

It depends entirely on what the contract says, and this is worth checking before signing rather than after. Many PPA agreements allow the obligation to transfer to the new owner, so the system and the payment arrangement continue uninterrupted under different ownership. Some contracts instead treat an early sale as a form of early termination, which can trigger a fee structured like liquidated damages rather than a simple clean exit.

Given that a landed home's ownership tenure doesn't always match a PPA's typical 15 to 25-year term, this transferability clause is a genuinely material term to read closely, arguably more consequential for most homeowners than the per-kWh rate itself.

Is a PPA available for an individual landed home?

Direct system purchase remains the dominant model for Singapore's individual private landed homes, reflecting both the smaller scale of a single residential system relative to an institutional tender and established market practice built up over years of direct-purchase installations. Where a residential provider does offer a PPA-structured arrangement, it is worth reading the contract closely, since the underlying trade-offs, no upfront cost against a long-term per-unit payment obligation, are the same considerations covered in Sunnify's broader installer-versus-operator comparison, which applies regardless of whether the specific structure on offer is a PPA, subscription, or lease.

Does the per-kWh rate stay fixed for the whole contract?

Not always, and this is one of the more easily missed terms in a PPA offer. Many PPAs include an escalation clause that raises the per-kWh rate by a small percentage, commonly in the 1-3% range, every year of the contract, intended to account for inflation and ongoing maintenance costs. Compounded over a 15 to 25-year term, even a modest annual escalator meaningfully changes the total amount paid, which is why comparing only the first-year rate against the current grid tariff understates the real long-term commitment.

Whether that escalator still leaves the PPA cheaper than the grid tariff over time depends on how the grid tariff itself moves, which has historically been volatile in Singapore and is far from guaranteed to stay flat. Asking specifically whether a quoted rate is fixed or escalating, and by how much, is a more useful question than asking for the headline first-year price alone.

How does a PPA compare to just buying a system outright?

A direct purchase costs more upfront but has no ongoing charge once paid off, generally producing the lowest total cost over a system's full 25-year lifetime. A PPA has no upfront cost but continues charging for electricity generated for the full contract term, which typically costs more in total than a direct purchase would, in exchange for eliminating upfront capital risk. Which suits a specific homeowner depends on available upfront budget and how long they expect to stay in the property.

Using Sunnify's own reference figures for a 10kWp system as an illustration: a direct purchase runs to a nominal 25-year total cost (system, one inverter replacement, and maintenance combined) of roughly S$25,500, after which generation is essentially free. A PPA covering the same generation, even priced below the grid tariff, is still paying for every kWh for the full contract term, so the crossover point where direct purchase becomes cheaper in total typically arrives well before the 25-year mark, often within the first decade, which is the trade-off a PPA is fundamentally asking a homeowner to accept in exchange for zero upfront cost.

What happens to system ownership and maintenance responsibility under a PPA?

The provider keeps both, for the full contract term. Unlike a direct purchase, where the homeowner owns the asset and is responsible for arranging maintenance (commonly budgeted around S$400 a year) and eventually the inverter replacement, a PPA provider retains ownership and is contractually responsible for keeping the system operating, since their revenue depends on it generating electricity. This shifts operational risk away from the homeowner, but it also means the homeowner has no equity in the system itself, even after 25 years of payments, which is worth weighing against the maintenance-and-ownership burden it removes.

Further reading: see solar installer vs solar operator for the broader ownership models comparison, and the EMA and SP Group approval process for how any solar installation gets connected regardless of financing model. Run the Sunnify solar estimate to see the direct-purchase numbers for your own home.