Singapore solar is a corporate sale. The buyer is a facilities director, a REIT asset manager, or a manufacturer’s sustainability lead, and the decision is usually structured as a power purchase agreement rather than a purchase. That makes the proposal a commercial contract summary with a yield model attached, not a residential savings brochure, and it rules out most of the software marketed as proposal tools.
Direct answer. The best solar proposal software in Singapore for most EPCs is SurgePV for the technical and layout side combined with a purpose-built financial model for the power purchase agreement structure. Residential-oriented platforms have almost no relevance in a market with negligible landed-housing solar volume and an overwhelmingly commercial pipeline.
TL;DR
- Most Singapore commercial solar is sold as a power purchase agreement, so the proposal is a tariff, a term, and a performance commitment.
- Export arrangements for embedded generation differ by scheme and threshold, and the treatment belongs in the model.
- Obstruction shading from neighbouring buildings drives the yield, so the shading study is a commercial document, not just a technical one.
- Sustainability reporting is frequently the real buying motive, so carbon reporting outputs matter alongside savings.
- Roof lease terms and building structural capacity often decide the deal before economics do.
What Singapore Actually Changes About Proposal Software
The structure is usually a PPA. Singapore commercial customers commonly buy solar electricity rather than a solar system, with the developer owning the asset on the customer’s roof. The proposal then has to state a tariff, a contract term, an escalation mechanism, and a performance commitment, and it has to survive a procurement review. Packaged residential proposal tools do not model any of that.
Export treatment depends on the scheme. Embedded generation in Singapore exports under defined arrangements that vary with installation size and registration route. The treatment of exported energy, and whether it is credited or settled at wholesale, materially affects the model, and it belongs on the page rather than in an assumption.
Shading is a commercial risk. Because obstruction shading from neighbouring buildings can be a large share of the loss budget, the shading study underpins the yield the PPA tariff is priced against. On a long-term contract, an optimistic shading assumption becomes the developer’s problem for the whole term. Future development on adjacent plots is a genuine risk to raise.
Sustainability drives the decision. For many Singapore corporate buyers the motivation is emissions reporting and green building certification as much as cost. A proposal that quantifies avoided emissions in a form that feeds the customer’s reporting is doing useful work that a pure savings model does not.
Roof access and lease terms matter. In a market of leased commercial buildings, the roof rights and the remaining lease term often decide whether a project is possible at all. That is a commercial conversation the proposal has to reflect.
The Platforms Ranked for Singapore
| Platform | Best for | PPA modelling | Obstruction shading | Design output | Price per seat per year |
|---|---|---|---|---|---|
| SurgePV | Technical proposal plus design | Yes | Yes, 8,760-hour | Full, with DWG | $1,299 to $1,899 |
| PVsyst plus financial model | Bankable PPA pricing | Fully manual | Best in class | Yield only | ~$500 plus time |
| HelioScope | Fast C&I layout and yield | No | Moderate | Layout only | ~$1,188 |
| Aurora Solar | Complex roof geometry | Configurable | Strong | Good | $1,908 to $3,108 |
| Sighten | Financing-led structures | Extensive | Inherited | No | Quote-based |
| Excel over hourly output | Bespoke PPA structures | Fully manual | Inherited | None | Time |
| OpenSolar | Small landed-property work | Basic | Basic | Basic | $0 plus transaction fees |
SurgePV carries the technical half of a Singapore proposal well: hourly yield with obstruction shading, string design, the single-line diagram, and a client-facing document. Technical detail in best solar design software in Singapore.
PVsyst with a purpose-built financial model remains how serious PPA pricing is done, because the tariff has to be derived from a bankable yield and a bespoke commercial structure. See PVsyst price.
HelioScope is quick for early-stage C&I sizing. See HelioScope pricing.
Try the software behind this guide
Price the PPA off a yield you can defend for 20 years
SurgePV models 8,760 hours with surrounding-building shading, sizes the system, and produces the single-line diagram plus a white-label proposal from one model.
Book a free SurgePV demo →No credit card. 20-minute walkthrough on one of your own projects.
What a Singapore Commercial Proposal Has to Contain
- System specification with capacity in kWp and kVA, module and inverter selection.
- Yield estimate with the data source, the modelling tool, and the shading basis named.
- Obstruction shading study including surrounding buildings, with the loss quantified.
- Export treatment under the applicable embedded generation arrangement.
- Tariff analysis against the customer’s actual electricity contract, not a national average.
- Commercial structure with tariff, term, escalation, and performance commitment if a PPA.
- Carbon avoided in a form that feeds the customer’s sustainability reporting.
- Structural position confirming a Professional Engineer assessment is included or scheduled.
- Roof rights and lease term confirmation.
Item 3 is the one that protects a 20-year contract. If a neighbouring plot is redeveloped taller during the term, the yield assumption changes and the developer carries it. Raising that risk explicitly is better practice than discovering it later.
Pricing in Singapore Dollars
| Stack | USD per year | Approx. SGD at 1.34 | Covers |
|---|---|---|---|
| PVsyst | ~$500 | ~S$670 | Yield, no proposal |
| HelioScope | ~$1,188 | ~S$1,592 | Layout and yield |
| SurgePV | $1,299 to $1,899 | ~S$1,741 to S$2,545 | Yield, SLD, proposal |
| SurgePV plus PVsyst | ~$1,799 to $2,399 | ~S$2,411 to S$3,215 | Full stack for PPA pricing |
Exchange rate is illustrative.
What Most Singapore EPCs Get Wrong
They price a long PPA off a yield that ignores future development.
Singapore redevelops aggressively. A rooftop that is unshaded today may be overlooked by a taller building within the contract term, and the developer priced twenty years of energy on the current skyline. The mature approach models a sensitivity for plausible adjacent development and either prices it in or addresses it contractually. Very few proposals do this, and it is a genuine differentiator with a sophisticated buyer.
The second mistake is treating the sustainability reporting output as a nice-to-have. For many Singapore corporate buyers it is the reason the project exists, and a proposal that hands them numbers in a usable reporting format is easier to approve internally.
When Proposal Software Is Not the Constraint
Most Singapore deals stall on structural capacity rather than on economics. Establishing whether an existing building can carry an array, and producing the Professional Engineer assessment the authority expects, is engineering work.
Our solar civil and structural engineering team produces those assessments with calculations via STAAD Pro report calculations, and solar rooftop detailed engineering design covers the construction pack. See the sample design pack or talk to our team.
Conclusion
- Model adjacent development risk on long PPAs. Singapore redevelops, and the yield you priced may not last the term.
- Provide reporting-ready carbon numbers. For many buyers that is the actual approval driver.
- Confirm roof rights and structural capacity early. Both kill more deals than pricing does.
In this country series: solar software in Singapore, best solar design software in Singapore, shading analysis software in Singapore, Helioscope review. Tool deep dives: Aurora Solar review, Opensolar review.
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Disclosure and accuracy note
Commercial relationship. Heaven Designs and SurgePV are part of the same group. Treat our recommendation of SurgePV as a vendor making its own case, not an independent verdict. We have tried to describe every other product fairly, and to say plainly where a competitor is the better choice.
Pricing. All prices are indicative, compiled from public sources when this page was written. They vary by tier, region, contract term and exchange rate, and change without notice. Several vendors quote rather than publish, and some price in currencies other than the US dollar, so a converted figure moves with the exchange rate. Confirm current pricing with the vendor before you decide anything.
Trademarks and corrections. All product names and trademarks belong to their respective owners, and are used here for identification and comparison only. Their use does not imply affiliation with or endorsement by those companies. If anything here is out of date or wrong, tell us and we will correct it.
FAQ
What is the best solar proposal software in Singapore? SurgePV for the technical and layout side, combined with a purpose-built financial model for the power purchase agreement structure. Residential-oriented platforms have little relevance here.
Why are most Singapore solar deals PPAs? Because commercial customers frequently prefer to buy electricity rather than own an asset on a leased roof. That makes the proposal a contract summary with tariff, term, escalation, and a performance commitment.
How is exported energy treated? Under the applicable embedded generation arrangement, which varies with installation size and registration route. State the treatment in the proposal rather than leaving it as an assumption.
Why is shading so important to a Singapore proposal? Because obstruction from neighbouring buildings can be a large share of the loss budget, and on a long PPA the yield assumption is a commercial commitment for the whole term.
Should the proposal include carbon numbers? Yes. Sustainability reporting and green building certification are frequently the real motivation, and reporting-ready figures make internal approval easier.
How much does solar proposal software cost in Singapore? From roughly S$670 per year for PVsyst alone to around S$3,215 for a full yield-plus-proposal stack. Cross-platform math is in our solar design software pricing breakdown.
What about the design software decision separately? Covered in best solar design software in Singapore.
