Singapore’s Standard Contestable Tariff (SCT) is the fixed-rate export compensation scheme for solar installations that sell surplus electricity to the SP PowerGrid network. Under SCT, every kilowatt-hour exported earns a predictable credit — approximately S$0.20/kWh — set by the Energy Market Authority and adjusted periodically. This predictability makes SCT the default choice for residential systems, small commercial rooftops, and any project where financial certainty matters more than wholesale market upside.
SCT is one of two export pathways in Singapore. The alternative is the Embedded Consumer Interconnection Scheme (ECIS), which pays the variable Uniform Singapore Energy Price (USEP). While ECIS can outperform SCT during periods of high wholesale prices, it also exposes the owner to market downside and requires more complex metering and administration. This guide covers how SCT works, who qualifies, how to apply, and how billing credits appear on your SP Services statement.
SCT Rate Is Set by EMA, Not Negotiated
The SCT rate is a regulated tariff set by the Energy Market Authority. Individual customers cannot negotiate a different rate with SP Services. The rate applies uniformly to all registered SCT participants. EMA reviews the rate periodically based on wholesale market conditions, grid costs, and policy objectives. Check the EMA website or your SP Services bill for the current applicable rate — do not rely on outdated figures in financial models.
What Is the Standard Contestable Tariff (SCT)?
SCT is a fixed-rate buyback mechanism for electricity exported from embedded solar generators to the SP PowerGrid network. “Contestable” refers to the consumer’s right to choose their electricity retailer in Singapore’s liberalised market; the SCT rate is derived from the regulated tariff available to contestable consumers who have not switched to a competitive retailer.
Key characteristics of SCT:
- Fixed rate: The export credit per kWh is known in advance and does not change within a billing period
- No market exposure: The credit is the same whether USEP is high or low
- Simple metering: A standard bi-directional net meter records total import and total export — no half-hourly granularity required
- SP Services administration: Registration, metering, billing, and credit application are all handled through your existing SP Services account
- No Market Participant registration: Unlike ECIS for large systems, SCT does not require registration with the Energy Market Company
SCT is designed for simplicity. A residential customer with a 5 kWp rooftop system can register for SCT, receive a bi-directional meter, and see export credits on the next monthly bill without engaging with wholesale market data or complex settlement reconciliation.
SCT Rate History and Review Cycle
The SCT rate is not static. EMA reviews it periodically — typically in line with broader tariff adjustments — to reflect changes in wholesale electricity costs, network charges, and policy direction.
| Period | Approximate SCT Rate | Notes |
|---|---|---|
| 2022–2023 | ~S$0.22–0.25/kWh | Elevated due to high natural gas prices post-2022 |
| 2024 | ~S$0.20–0.22/kWh | Gradual moderation as gas prices stabilised |
| Early 2025 | ~S$0.19–0.21/kWh | Continued adjustment toward longer-term average |
| 2026 (current) | ~S$0.20/kWh | EMA-reviewed rate; check SP Services for exact figure |
The SCT rate has historically tracked below the retail electricity tariff but above the average USEP during most periods. This positioning reflects EMA’s intent to provide a reasonable export incentive without overcompensating generators at the expense of other ratepayers.
Check the Current SCT Rate Before Finalising Financial Projections
EMA publishes tariff information on ema.gov.sg and SP Services includes the current SCT rate in its export registration documentation. Always confirm the current rate before presenting payback or ROI figures to a client. Using an outdated rate from a previous year can overstate or understate project returns by 10–20%.
SCT vs ECIS: Detailed Comparison
Choosing between SCT and ECIS is one of the most consequential decisions for a Singapore solar project. The right choice depends on system size, generation profile, and the owner’s tolerance for administrative complexity and price variability.
| Factor | SCT | ECIS |
|---|---|---|
| Export rate | Fixed ~S$0.20/kWh | Variable USEP (half-hourly) |
| Rate range | Fixed regardless of market | ~10–25 ¢/kWh (can spike higher) |
| Average rate (early 2026) | ~20 ¢/kWh | ~15.8 ¢/kWh |
| Rate certainty | High — known in advance | Low — market-linked |
| Meter type | Standard bi-directional net meter | Half-hourly smart export meter |
| Meter cost | Consumer expense | Consumer expense (typically higher) |
| Settlement | Monthly via SP Services bill | Monthly via SP Services bill |
| Admin complexity | Low | Moderate (USEP reconciliation) |
| Market upside | None | Yes — USEP can exceed SCT in peak periods |
| Market downside | None | Yes — USEP can fall below SCT in oversupply |
| Market Participant registration | Not required | Required for systems above 1 MWac |
| System size limit | No stated cap | 10 MWac per installation |
| Credit treatment | Carries forward; no cash payout | Confirm with SP Services at registration |
| Best suited for | Residential, small commercial, simplicity | Large C&I, wholesale exposure acceptable |
When SCT is the better choice:
- Systems below 100 kWp where the cost and complexity of ECIS smart metering outweigh potential revenue gains
- Residential customers who want predictable bills without monitoring wholesale prices
- Projects where financial modelling must show conservative, guaranteed returns to secure approval
- Systems with a generation profile that peaks at midday — when USEP is often lowest due to solar oversupply
When ECIS may outperform SCT:
- Large C&I systems above 500 kWp where even a small per-kWh advantage compounds into significant annual revenue
- Systems with battery storage or load-shifting capability that can export during peak-demand evening hours
- Projects where the owner has the resources to reconcile monthly USEP settlements against EMC data
The Midday USEP Trap
Singapore’s solar generation peaks around 12:00–14:00 on clear days — the same period when many C&I rooftops are exporting simultaneously. This oversupply can suppress USEP to 8–12 ¢/kWh during these hours, well below the SCT fixed rate. A south-facing system with no storage that exports heavily at midday may earn less under ECIS than under SCT, even when the monthly average USEP appears competitive. Model half-hourly generation against half-hourly USEP before choosing ECIS.
Who Is Eligible for SCT?
SCT eligibility is broad. The main requirements are:
- Grid-connected system: The solar installation must be connected to the SP PowerGrid network. Off-grid systems are not eligible because there is no export pathway.
- SP Services account: The premises must have an active SP Services electricity account. Export credits are applied to this account.
- LEW sign-off: A Licensed Electrical Worker must inspect and certify the installation.
- No minimum size: There is no lower kWp threshold. A 2 kWp residential balcony system and a 900 kWp commercial rooftop are equally eligible.
- No stated maximum: The SCT rules do not specify an upper capacity limit. However, systems at or above 1 MWac typically require EMA Generation Licence and EMC Market Participant registration — at which point ECIS becomes the more natural pathway.
Both residential and commercial customers can register for SCT. The application form and process are the same regardless of customer type. JTC tenants on industrial estates can also use SCT, provided they have obtained JTC’s written consent for the rooftop works.
SCT Application Process
Step 1: Confirm system size and export scheme
Before applying, confirm that SCT is the right choice for your project. Review the SCT vs ECIS comparison above. If your system is below 100 kWp and you value simplicity, SCT is almost certainly the right path. If your system is above 500 kWp, model both schemes before committing.
Step 2: Complete installation and LEW inspection
Your solar contractor must complete the physical installation. The appointed Licensed Electrical Worker then inspects the system and signs the installation completion certificate. This certificate is mandatory for SCT registration — SP Services will not process an application without it.
The LEW is also responsible for:
- Submitting the Electrical Installation (EI) application to EMA
- Ensuring the system meets anti-islanding and protection requirements
- Confirming inverter compliance with SP PowerGrid standards
Step 3: Submit SCT registration to SP Services
Download the SCT Export Registration Form from SP Services (spgroup.com.sg). This is the formal application to register the system under the Standard Contestable Tariff.
Prepare supporting documents: SP Services account number, site address, system capacity in kWp and kWac, inverter make and model, panel specifications, and the LEW’s installation completion certificate and licence number.
Submit to SP Services. SP Services reviews the registration for completeness and eligibility. Incomplete submissions are returned — check that all fields are filled and the LEW certificate is included.
Retain copies of all submitted documentation. SP Services may request clarification during review. Response times are typically 2–4 weeks from complete submission.
Step 4: SP Services verification and meter installation
SP Services verifies the submission and checks whether the premises already has a bi-directional meter. If not, SP Services schedules meter installation. Key points:
- The meter installation is arranged by SP Services — the customer does not book this independently
- Installation typically takes 2–4 weeks from registration approval
- The system cannot legally export under SCT before the bi-directional meter is commissioned
- The cost of meter installation is borne by the customer
For premises that already have a bi-directional meter (for example, from a previous solar installation), SP Services may activate SCT registration without a new meter installation.
Step 5: First SCT bill
Once the meter is commissioned and SP Services confirms SCT activation, export credits begin accruing from the next billing period. The first SCT credit typically appears on the SP Services bill 4–8 weeks after complete registration, depending on billing cycle timing.
SCT Billing Mechanics
Understanding how SCT credits appear on your SP Services bill is essential for reconciling payments and explaining the mechanism to clients.
How the Monthly Bill Is Structured
Your SP Services bill under SCT contains three key line items:
| Line Item | Description | Rate |
|---|---|---|
| Import charges | kWh drawn from the grid | Your retail tariff (typically S$0.28–0.35/kWh for business) |
| Network and market charges | Transmission, distribution, and market fees | Varies by tariff category |
| Export credit (SCT) | kWh exported to the grid | Fixed SCT rate (~S$0.20/kWh) |
The net bill equals: import charges + network charges - export credit.
Credit Balance Treatment
If your export credit exceeds your import charges in a given month, the surplus becomes a credit balance on your SP Services account. This balance:
- Carries forward to the next billing period automatically
- Offsets future bills — import charges in subsequent months are reduced by the credit balance
- Does not earn interest
- Is not paid out in cash — SCT credits can only be used to offset SP Services electricity charges
This is a critical distinction from some net metering schemes in other countries that write cheques for surplus generation. In Singapore, SCT is a bill-credit mechanism, not a cash-generating one. Size your system to match daytime consumption where possible — oversized systems that export heavily every month will accumulate credit balances that cannot be monetised.
SCT Credits Cannot Be Withdrawn as Cash
Unlike some feed-in tariff schemes in Europe or Australia, Singapore’s SCT does not make cash payments for export surpluses. Credits remain on your SP Services account and can only reduce future electricity bills. If you are considering a system size that would produce more export than you can offset against import, discuss with your installer whether a smaller system or battery storage would improve project economics.
Example Bill Calculation
A small commercial customer with a 50 kWp rooftop system in a given month:
| Item | kWh | Rate | Amount (S$) |
|---|---|---|---|
| Import (grid draw) | 2,500 | S$0.32/kWh | 800.00 |
| Network charges | — | Fixed + variable | 120.00 |
| Export credit (SCT) | 1,800 | S$0.20/kWh | -360.00 |
| Net bill | 560.00 |
Without solar, this bill would have been S$920.00 (2,500 kWh × S$0.32 + network charges). The solar system reduces the net bill by S$360.00 through SCT export credits, plus the avoided import of any self-consumed solar generation (not shown in this export-only example).
Common SCT Mistakes and How to Avoid Them
| Mistake | Consequence | How to Avoid |
|---|---|---|
| Applying for SCT before LEW sign-off | Application rejected; delays of 2–4 weeks | Wait for LEW completion certificate before submitting |
| Wrong SP Services account number | Registration linked to wrong premises; credits misapplied | Double-check account number against a recent bill |
| System size mismatch on form | SP Services rejects registration; requires resubmission | Confirm kWp and kWac figures with your installer before submitting |
| Assuming SCT credits are paid in cash | Disappointment when surplus credits cannot be withdrawn | Explain credit-carry-forward mechanism to clients upfront |
| Not activating export after meter installation | Lost revenue during gap between meter commissioning and SCT activation | Confirm SCT activation date with SP Services; do not assume it is automatic |
| Using outdated SCT rate in financial models | Inaccurate ROI projections; client disputes | Check EMA or SP Services for current rate before modelling |
| Oversizing system relative to consumption | Large uncashable credit balances accumulating monthly | Size system to 60–80% of annual consumption for optimal economics |
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Switching Between SCT and ECIS
It is possible to switch from SCT to ECIS (or vice versa) after registration, but the process involves re-registration and meter changes.
SCT to ECIS:
- Submit a new ECIS Export Registration Form to SP Services
- SP Services replaces the bi-directional net meter with a half-hourly smart export meter
- Allow 4–8 weeks for the switch
- ECIS settlement begins from the first complete billing period after smart meter commissioning
ECIS to SCT:
- Submit an SCT registration form to SP Services
- SP Services may reinstall a bi-directional net meter or reconfigure the existing meter
- Allow 4–8 weeks for the switch
- SCT credits resume at the fixed rate from the next billing period
Switching costs include the meter change fee charged by SP Services and any administrative time spent on re-registration. For small systems, the switching cost may exceed the potential revenue difference between the two schemes. Model carefully before switching.
SCT for JTC Tenants and Industrial Estates
JTC Corporation tenants who install solar on leased industrial premises can register for SCT like any other SP Services customer. The JTC-specific requirements are:
- JTC written consent must be obtained before any rooftop works begin — this is a lease condition, not an SCT requirement
- LEW sign-off follows the same process as non-JTC installations
- SCT registration with SP Services is identical to the standard process
- JTC as-built drawings must be submitted to JTC after installation completion
Many JTC tenants use the Solar Power Purchase Agreement (SPPA) model, where a third-party developer owns the system and sells electricity to the tenant. In this model:
- The developer (as system owner) registers for SCT or ECIS
- The tenant receives a fixed electricity rate from the developer
- The developer receives SCT credits on their SP Services account for any export
The SCT credit-carry-forward rule still applies to the developer’s account. Developers structuring SPPA deals should model credit accumulation carefully — a portfolio of JTC rooftops with high export ratios may accumulate significant uncashable credits.
Related Singapore Compliance Guides
- ECIS Registration Singapore — market-rate export scheme with USEP settlement, smart metering, and half-hourly reconciliation
- Singapore Solar Regulations Overview — full country compliance pillar covering EMA licensing, JTC mandatory solar, BCA structural requirements, and SCDF fire safety
- Solar Compliance Hub — compliance resources for all markets
Use solar software that supports Singapore’s SCT rate, SP PowerGrid interconnection standards, and tropical irradiance data to produce designs and financial proposals that meet EMA technical requirements from the first draft.
Frequently Asked Questions
What is the SCT rate for solar exports in Singapore?
The Standard Contestable Tariff (SCT) pays a fixed rate of approximately S$0.20/kWh for electricity exported to the SP PowerGrid network. The rate is set by the Energy Market Authority and adjusted periodically. Unlike ECIS, which fluctuates with the wholesale USEP, SCT offers predictable revenue regardless of market conditions.
Who is eligible for SCT?
SCT is available to all grid-connected solar systems below 1 MWac that are registered with SP Services. There is no minimum system size. Both residential and commercial customers can opt for SCT. Systems at or above 1 MWac typically use ECIS because Market Participant registration is required anyway, but SCT is technically available to any system size — there is no cap stated in the SCT rules.
How do I apply for SCT?
Apply through SP Services after your solar system is installed and inspected by your Licensed Electrical Worker (LEW). Submit: the SCT registration form, your SP Services account number, system capacity and inverter details, and the LEW’s installation completion certificate. SP Services verifies the submission, installs export metering if not already present, and activates the SCT agreement. The process typically takes 2–4 weeks from complete submission.
How does SCT billing work?
SP Services bills the customer monthly. Import charges (kWh drawn from the grid) appear at the customer’s standard retail tariff. Export credits (kWh sent to the grid) appear as a line-item credit at the SCT fixed rate. The net bill is import charges minus export credits. If export credits exceed import charges in a given month, the credit balance carries forward to the next month. SCT does not make cash payments for credit balances — credits can only offset future bills.
Should I choose SCT or ECIS?
Choose SCT if you prefer billing simplicity and rate certainty. SCT is ideal for smaller systems (residential, small commercial) where the administrative overhead of ECIS Market Participant registration outweighs the potential upside from wholesale price volatility. Choose ECIS if you have a larger system, are comfortable with wholesale market exposure, and want the potential for higher revenue when USEP spikes. Most systems below 100 kWp choose SCT; most systems above 1 MWac choose ECIS.
