> Quick view: Smart Energy runs a Happy Hour every day from 12am to 6.30am: members get an extra 5% off diesel, RON 95 and RON 98 on top of the standard 28.75% member discount, a total of 32.3125% off the pump price. On the current board that is $2.36 a litre for RON 95 and $2.42 for Euro-5 diesel. The only gate is a prepaid Energy Card ($5 or $3, one time), and there is no end date.
Smart Energy, the home-grown fuel retailer with four stations at Mandai, Jalan Buroh, Defu Lane and Queensway, confirmed the mechanics of its Happy Hour promotion to us directly this week. Every night from midnight to 6.30am, members pumping with a valid Energy Card get an extra 5% off diesel, RON 95 and RON 98, stacked on the 28.75% they already get around the clock. The company says the promotion is ongoing daily with no confirmed end date, and will run until further notice from management.
That makes the quietest hours of the day the cheapest fuel window in Singapore. The $2.36 Happy Hour litre of RON 95 is $1.14 under the $3.50 pump price on Smart Energy's own board, and the majors were last listing RON 95 at $3.56 to $3.60.
*Photo: Smart Energy official.*
The offer
| Deal | Extra 5% off during Happy Hour, on top of the 28.75% standard member discount (32.3125% off in total) |
| Hours | 12.00am to 6.30am, every day |
| Fuels | Diesel, RON 95 and RON 98, subject to availability at each station |
| Who | Smart Energy members pumping with a valid Energy Card |
| Where | All four Smart Energy stations |
| Ends | No confirmed end date, until further notice |
Where to sign up: registration is at the cashier counter of any station with your NRIC or driving licence, and prices, stations and promotions are published on Smart Energy's official site.
What a litre costs during Happy Hour
Smart Energy publishes its prices on an online price board, last updated 9 September 2026 and unchanged when we re-read it on 12 November 2026:
| Fuel | Pump price | Member price | Happy Hour (12am to 6.30am) |
|---|---|---|---|
| RON 95 | $3.50 | $2.49 | $2.36 |
| RON 98 | $3.99 | $2.84 | $2.70 |
| Euro-5 diesel | $3.59 | $2.55 | $2.42 |
Non-members get 25% off (RON 95 at $2.62) but not the Happy Hour price, which sits on the member rate. CNG at Mandai is $3.52 per kg for members against a $4.95 listed price; Smart Energy's list of Happy Hour fuels covers diesel, RON 95 and RON 98.
The four stations
| Station | Address | Fuels | Card |
|---|---|---|---|
| Mandai | 1 Mandai Link, S(728650) | CNG, diesel, RON 95 | Red/White, $5 |
| Jalan Buroh | 33 Jalan Buroh, S(619487) | Diesel, RON 95, RON 98 | Red/White, $5 |
| Defu | 7 Defu Lane 4, S(539411) | Diesel only | Blue, $3 |
| Queensway | 264 Queensway, S(149062) | Diesel, RON 95, RON 98 | Blue, $3 |
The fine print
- Members only. The Happy Hour discount applies when you pump with a valid Smart Energy member card. There are two: the $5 Red/White Energy Card for the Mandai and Jalan Buroh stations, and the $3 Blue Energy Card for Defu Lane and Queensway. Both are one-time fees.
- It is a prepaid card. Top up at the cashier or self-service kiosk by cash, NETS or credit card. Mandai and Jalan Buroh need a minimum $20 card value to activate the pumps; Smart Energy's site says Defu has no minimum.
- Check your grade against the station. RON 98 is only at Jalan Buroh and Queensway, Mandai is the only station with CNG, and Defu sells diesel only.
- How 32.3125% happens. The discounts multiply rather than add: 25% station discount, then 5% member discount (28.75% in total), then the extra 5% during Happy Hour.
- No end date, which also means no guarantee. Smart Energy told us the promotion runs until further notice from management, and its board prices are subject to change.
Tips
- Diesel drivers gain the most. The $2.42 Happy Hour litre is the cheapest diesel we have seen published anywhere in Singapore this year; the majors list diesel at $4.00 and up.
- On the Queensway strip, compare three pumps. Smart Energy's newest station at 264 Queensway sits a few doors from Cnergy at 260 and Esso Queensway B at 262; our cheapest petrol tracker keeps the running comparison.
- Points on top. Fuel purchases earn loyalty points that can be redeemed for S-Mart convenience store credits at Smart Energy's stations.
*Source: the Happy Hour hours, the extra 5% and the 28.75% and 32.3125% member discounts, the card fees, station addresses and per-station fuel availability were provided to MissLobang directly by SMART Energy Pte Ltd on 12 November 2026, and cross-checked against smartenergy.sg. Member and Happy Hour prices are from Smart Energy's online price board, last updated 9 September 2026 and re-read on 12 November 2026; prices are subject to change. Artwork: Smart Energy.*
