Singapore gives solar customers a choice most markets do not, and it is a choice made almost entirely on modelling. The Solar Capability Transfer scheme pays roughly S$0.20 per kWh at a fixed rate. The Enhanced Central Intermediary Scheme pays the variable USEP wholesale rate, typically 10 to 20 cents per kWh, with EMC Market Participant registration and a 10 MWac cap. One offers certainty, the other exposure to wholesale movement, and the difference over a system’s life is larger than most design decisions will produce. Yet most quoting tools cannot represent a variable wholesale rate at all. This guide covers what the Singapore stack has to do.
Short version. The best solar software for a Singapore business in 2026 is a stack whose core can model both export schemes honestly, including the variability in ECIS, and which flags the 1 MWac licence threshold before a design crosses it. Add credible inter-building shading analysis, because Singapore’s density makes that the dominant technical variable.
This page covers the category as a whole. For the tool-by-tool comparisons see our best solar design software Singapore and best solar proposal software Singapore guides, and the density-specific treatment in solar shading analysis software Singapore.
Model SCT against ECIS on a real site
A SurgePV engineer takes one of your Singapore sites, prices the output under both export schemes with USEP variability shown, and produces the branded proposal from the same record.
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The Six Categories, And The Scheme Decision
| Category | What it does | Singapore emphasis |
|---|---|---|
| Design and simulation | Layout, inter-building shading, yield | Density makes shading the dominant variable |
| Proposal and quoting | SCT versus ECIS modelling, payback | The scheme choice is the main analysis |
| Licensing and compliance | LEW submission, EMA licence above 1 MWac | LEW applies universally, licence at threshold |
| CRM and pipeline | Leads, follow-up, conversion | API connection is sufficient |
| Project execution | EI application, install, commissioning | Licence adds three to six months above 1 MWac |
| Monitoring | Performance, service, warranty | Standalone |
What Is Genuinely Singapore-Specific
Two export schemes with different risk profiles. SCT’s fixed S$0.20 sits above the typical ECIS range, so on a straightforward comparison SCT looks better for most customers. ECIS becomes interesting at scale, where wholesale exposure may be acceptable and the administrative burden of EMC registration is proportionally smaller. The honest analysis shows both with the volatility visible, rather than picking one.
The modelling requirement is specific: representing ECIS properly means carrying a variable rate rather than an average, because averaging a volatile price hides exactly the risk the customer is being asked to accept.
The 1 MWac licence threshold. Below it, no EMA Generation Licence. At or above, a full licence via the ELISE portal taking an estimated three to six months. A design that crosses the line during scoping has changed programme substantially, and that should surface in the tool rather than in a conversation with EMA.
Universal LEW requirement. Every installation needs a Licensed Electrical Worker to submit the Electrical Installation application. No size exemption, so it belongs in the standard project template.
Density and inter-building shading. Singapore’s obstruction is usually the neighbouring tower, frequently off-property and outside anyone’s control. That makes shading analysis both harder and more consequential than on a typical suburban roof, and it argues for hourly module-level modelling rather than a geometric estimate.
SS 638 and the IEC set. Wiring, inverter and module standards respectively.
Where Singapore Teams Overbuy And Underbuy
Underbought: variable-rate modelling for ECIS. The clearest gap. A tool that can only hold a fixed export price cannot represent one of the two available schemes.
Underbought: inter-building shading at module level. Given the built environment, this is where design accuracy is won or lost, and geometric estimates on a dense site are frequently wrong in both directions.
Underbought: threshold awareness at 1 MWac. A three to six month approval process is not something to discover late.
Overbought: platforms optimised for large ground-mount. Singapore’s constraint is roof area and neighbouring towers, not land. Tools built around utility-scale row optimisation solve a problem the market does not have.
Overbought: seats for viewers. Universal.
Show USEP variability, not an average
SurgePV models ECIS against a variable wholesale rate rather than a single figure, so the customer sees the risk they are being asked to take alongside the upside.
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The Platforms Singapore Businesses Should Evaluate
1. SurgePV, the integrated core
Design and proposals from one record, with SCT and ECIS modelling including USEP variability, 1 MWac threshold awareness, SS 638 and IEC component libraries, hourly module-level inter-building shading and 8,760-hour simulation. White-label proposals with e-signature. $1,299 to $1,899 per user per year.
2. PVsyst
The bankable simulation reference, frequently named by lenders and by the larger commercial and industrial clients that dominate Singapore demand. No proposal layer and no scheme logic. See our PVsyst alternative review.
3. HelioScope
Capable browser-based engineering for commercial rooftops, which is most of the Singapore market. No proposal layer. Our HelioScope alternative guide covers the trade-offs.
4. Aurora Solar
Strong residential design built around US net metering, which has no Singapore counterpart, and oriented toward a residential segment that is small here. See our Aurora Solar alternative comparison.
5. OpenSolar
Free and quick, with a presentable customer document. No scheme modelling or licence threshold awareness. See our OpenSolar alternative comparison.
6. Consultant spreadsheets plus PVsyst
Common on larger Singapore projects. Defensible engineering, and the usual home of an averaged USEP figure standing in for a volatile price.
Singapore Solar Software Stack Comparison
| Capability | SurgePV | PVsyst | HelioScope | Aurora | OpenSolar |
|---|---|---|---|---|---|
| Design and simulation | Yes | Yes | Yes | Yes | Partial |
| Proposal from design record | Yes | No | No | Yes | Yes |
| SCT fixed-rate modelling | Yes | Manual | No | No | Partial |
| ECIS variable USEP modelling | Yes | Manual | No | No | No |
| 1 MWac threshold flagged | Yes | No | No | No | No |
| Inter-building shading, module level | Yes | Yes | Yes | Partial | Partial |
| SS 638 and IEC libraries | Yes | Partial | Partial | No | No |
| Bankable yield reporting | Yes | Yes | Partial | Partial | No |
Worked Example: The Same Rooftop Under Both Schemes
An illustrative comparison, not a specific customer project. A commercial rooftop exporting a meaningful share of its generation.
| Under SCT | Under ECIS | |
|---|---|---|
| Export rate | Roughly S$0.20 per kWh, fixed | USEP, typically 10 to 20 cents, variable |
| Predictability | High | Exposed to wholesale movement |
| Registration | SP Services | EMC Market Participant |
| Installation cap | None stated | 10 MWac |
| Administrative burden | Lower | Higher |
| Typical better fit | Most commercial and smaller installations | Larger installations able to carry price exposure |
On the headline numbers SCT’s fixed rate sits above the middle of the ECIS range, which makes it the straightforward choice for most customers. The reason to model both anyway is that the comparison is not purely about the expected value. It is about whether the customer wants a known number for twenty years or is willing to trade certainty for potential upside, and that is their decision to make with good information rather than yours to make on their behalf.
The modelling point worth stressing is the second row. Presenting ECIS at an averaged rate makes it look like a slightly worse fixed scheme, which misrepresents it entirely. The whole character of ECIS is its variability, and a proposal that averages it away has removed the only thing the customer needs to think about.
Who Should Choose What
- Choose SurgePV if you need both export schemes modelled with USEP variability and the 1 MWac threshold flagged.
- Choose PVsyst where a lender or large commercial client names it, paired with separate quoting.
- Choose HelioScope if your team is engineering-only on commercial rooftops.
- Do not average USEP. It removes the only characteristic that distinguishes ECIS from SCT.
After signing, pipeline and follow-up sit in a CRM. QuickEstimate takes the handoff from SurgePV by API.
Both schemes, one model
SCT fixed-rate and ECIS variable USEP modelling, 1 MWac threshold awareness, SS 638 and IEC libraries, module-level inter-building shading and white-label proposals from $1,299 per user per year.
Book a Free DemoThe Bottom Line
Singapore’s software job is helping the customer choose a scheme, not just sizing an array.
- Model SCT and ECIS side by side. The choice affects the return more than most design decisions and the customer cannot make it unaided.
- Represent USEP as variable. Averaging it turns ECIS into a worse fixed scheme and hides the actual trade.
- Flag 1 MWac before you cross it. A full EMA licence adds an estimated three to six months.
Frequently Asked Questions
What software does a Singapore solar company actually need?
What is the difference between SCT and ECIS?
Which scheme should a customer choose?
When does a Singapore project need an EMA Generation Licence?
Does every installation need a Licensed Electrical Worker?
What standards apply to Singapore solar installations?
Which solar software should a Singapore installer start with?
Nirav Dhanani CEO, Qbits Energy
Co-founder & CEO driving Qbits Energy's product strategy and growth across India.