Every Singapore retail electricity plan, ranked for your home

Two sources, both refreshed automatically. Standard plans — flat fixed-rate and discount-off-tariff — come from the public SP Digital API that powers the official Open Electricity Market Price Comparison Tool, refreshed at least every 6 hours. Non-standard plans do not appear on that tool at all, so they are read from each retailer's own EMA price plan fact sheet by a script that runs monthly, storing the full fact sheet text so every rate can be traced back to the document it came from.

EMA splits plans into Standard (a flat fixed rate, or a straight discount off the regulated tariff) and Non-Standard (any other structure — peak/off-peak time-of-use, usage tiers, 36-month terms, no-contract). The government comparison site only ranks Standard plans, so on a solar home the most interesting plans are usually the ones you cannot see there. This tool prices them too, with the fact-sheet date shown against each one. Time-of-use plans need an advanced (AMI) meter. Your day/night split is solar hours (7am–7pm); each plan's real peak window is mapped onto those hours, including evening peaks that run past sunset.

EMA is explicit, and the two schemes pay very differently. If you buy from SP Group, surplus is paid under Simplified Credit Treatment: the prevailing regulated tariff minus grid/network charges, fixed for the quarter. If you buy from an OEM retailer, surplus is paid under the Enhanced Central Intermediary Scheme at half-hourly wholesale prices, of which USEP is the key component — so it moves every half hour and every month.

Solar only exports in daylight, so a 24-hour average of wholesale prices would overstate an ECIS credit: the expensive evening peaks happen when your roof produces nothing. It goes further than that. ECIS pays for what actually leaves your house, half-hour by half-hour, and a house exports hardest in the middle of the day — which is exactly when wholesale prices are at their lowest, because every other solar roof in Singapore is exporting too. So this tool prices your surplus against the half-hours you actually export in, using the prices that applied on each measured day, rather than a flat daylight average. That lands below the fleet-wide figure quoted above, and it is the number your bill will follow.

So self-consumption is the overlap of the two curves in time, not the overlap of their daily totals. The tool adds up min(your demand, solar output) in each of the 48 half-hours of the day, and repeats that for every measured day in the window so that cloudy days and clear days both count. There is a useful piece of arithmetic here: the sum of the smaller of two numbers can never exceed the smaller of their sums. A day/night bucket model is therefore not just different, it is a strict upper bound — it can only ever flatter solar. Correcting it moves the estimate down, which is the direction we would rather err in.

A typical Singapore day yields about 3.5 to 4.0 kWh per kWp installed, so a 10 kWp roof produces roughly 35 to 40 kWh. That figure sets the size of the day; the shape of it comes from Singapore's measured half-hourly solar output, and each measured day keeps its own shape and its own output, so a cloudy day and a bright day both enter the average rather than being blended into one artificially smooth day. You can type a solar size, leave it at 0, or upload a usage file and keep the solar field as a what-if.

A CSV or text export from SP Group or your retailer, up to 4 MB. Monthly totals, daily readings and half-hourly interval data all work, and account or address lines above the header are skipped. The timestamps decide which one you have: the median gap between consecutive readings sets the interval, so a small flat's daily readings are never mistaken for a large home's half-hourly ones. With a week or more of half-hourly data the tool also builds your household's own load curve and uses it in place of EMA's average household profile, which is the most accurate way to run this. Nothing is uploaded to a server — the file is read in your browser and never leaves your device.

Yes. Electricity is delivered over the same SP grid regardless of retailer — only the billing changes. Check contract duration, early termination charges and auto-renewal terms before signing.

It is a model, so here is exactly where it simplifies. Unless you upload half-hourly readings, your consumption is shaped by EMA's published average household profile, tilted to the day/night split you set, so it is the average Singapore home's pattern rather than your own meter: if your household runs hard at 3pm, or nobody is home until 8pm, your self-consumption differs from this. Uploading a week or more of half-hourly data removes that simplification entirely, because your own curve is used in its place. Solar is Singapore's own measured fleet output, which is smoother than a single roof because clouds do not cover the whole island at once — one array is spikier, which would push self-consumption slightly lower, not higher. Seasonality is limited to the measured window shown above, not a full year. Sign-up rebates, gifts, early termination charges, advanced-meter installation fees and any optional carbon or renewable-certificate add-ons are shown where known but are never folded into the ranking, because they are conditional. Non-standard rates are read from each retailer's fact sheet on the date shown; anything older than four months carries a warning, because retailers reprice between our refreshes.

The consequence: treat the ranking as a shortlist and the savings figure as an order of magnitude, then confirm the final rate on the retailer's own fact sheet before you sign. Every row links to the document its numbers came from so you can check us.

Sunollo is a Singapore rooftop solar company. We built this because our own customers kept asking which retail plan to pair with a new solar system, and no free tool priced non-standard plans or the SCT-versus-ECIS export gap. We are not an electricity retailer, not a switching broker and not an EMA, SP Group or Energy Market Company agent. We receive no commission, referral fee or payment from any retailer listed here, and no retailer can pay to change its position — the ranking is purely the cheapest estimated bill for the numbers you entered, which is why SP Group's regulated tariff often wins on a solar home.

Our commercial interest is straightforward and worth stating: we sell and install solar, so we benefit if you decide solar is worth it. That is also why the solar field starts at zero and why the export-credit comparison is shown in full, including the cases where switching retailer makes a solar home worse off.