Solar ATAP Credits Expire Every Month: What That Means
Contents
- Key Takeaways: Solar ATAP Credits
- How Solar ATAP Credits Are Calculated
- Why Solar ATAP Credits Expire
- Example: Two Homes, Same System, Different Outcomes
- What This Means for Your System Size
- Three Ways to Waste Fewer Credits
- Who Is Most Affected by Expiring Credits
- Solar ATAP Credits and Your Other Numbers
- Frequently Asked Questions About Solar ATAP Credits
Under the Solar ATAP programme, unused Solar ATAP credits are forfeited at the end of each billing period. They do not carry into the next month the way NEM credits did. That rule changes the right system size for your home, and it is the main reason oversizing now costs you money.
Quick answer: Energy you export to the grid is credited at your domestic tariff’s energy charge rate, not the full retail rate. Any Solar ATAP credits left unused within that billing period are forfeited — no carry-forward, no cash payout. The consequence: every unit you consume yourself during the day is worth more than a unit you export, and a system oversized for your consumption pattern wastes capacity every month.
This is the most consequential difference between Solar ATAP and NEM, and it is the one most often missed because it does not appear in a brochure. Under NEM, the grid worked like a free battery — push out during the day, draw back at night, credits accumulating month to month. Under Solar ATAP, the clock resets at the end of every billing period.
Key Takeaways: Solar ATAP Credits
How credits are calculated and why they expire.
- Domestic exports are credited at your tariff’s energy charge rate, not the full retail rate.
- Unused credits at the end of a billing period are forfeited — no rollover, no cash.
- Non-domestic customers are credited at the average System Marginal Price, a market rate that moves monthly.
- Solar ATAP contracts run ten years; residential limits are 5 kWac single-phase and 15 kWac three-phase.
- Daytime self-consumption is worth more than export, so system size should follow daytime load.
- Official reference: Energy Commission guideline GP/ST/No. 60/2025.
How Solar ATAP Credits Are Calculated
When your panels generate more than the house is using at that moment, the surplus flows to the grid. Solar ATAP credits that energy against your bill, but not at the same value as the energy you buy.
Your electricity bill has several components: energy charge, capacity charge, network charge, retail charge and others. Export credits are calculated against the energy charge component only. The other components still apply.
| Customer type | Export credit basis | Notes |
|---|---|---|
| Domestic | Domestic tariff energy charge rate | Tiered by monthly consumption — around 27 sen/kWh at 1,500 kWh or below, and around 37 sen/kWh above that |
| Non-domestic | Average System Marginal Price (SMP) | Market-linked rate that changes every month |
Energy charge rates move with the current TNB tariff structure. Confirm the figures against your own bill or the TNB tariff guide before running numbers.
Why Solar ATAP Credits Expire
The rule is short and strict: any export credit not used by the end of the billing period lapses. It does not carry into the following month, and it cannot be converted to cash.
Under NEM, the one-for-one offset meant a home generating a large surplus in March could use those credits in June. Households that travel for a month, or whose consumption swings seasonally, benefited from that mechanism.
Solar ATAP closes that door. Each billing period stands alone. If you export more than you import this month, the surplus is gone when the bill closes.
Example: Two Homes, Same System, Different Outcomes
Take two homes that each install a 5 kWac system and each generate roughly 600 kWh a month.
| Item | Home A — occupied during the day | Home B — empty during the day |
|---|---|---|
| Monthly generation | 600 kWh | 600 kWh |
| Self-consumed in daylight | 380 kWh | 120 kWh |
| Exported to the grid | 220 kWh | 480 kWh |
| Value of self-consumption | Full retail rate avoided | Smaller, because daytime load is low |
| Value of export | Credited on the energy charge only | Credited on the energy charge only |
| Risk of forfeited credits | Low | High if night imports are smaller than accumulated credits |
These figures illustrate the mechanism rather than estimating any specific home. Real numbers depend on roof, orientation, weather and consumption habits.
Home A extracts more value from the same system purely because the timing of its consumption matches the timing of generation. That is the whole game under Solar ATAP.
What system size is right for you?
We read the consumption pattern in your TNB bill and recommend the size that maximises self-consumption, not the largest one that fits.
What This Means for Your System Size
Under NEM the logic was simple: install as much as the roof and the quota allowed, because every surplus unit kept its full value. That logic no longer holds.
Under Solar ATAP, a system larger than your daytime load produces surplus that is credited at a lower rate, and some of it may be forfeited outright. You still get something, but each additional kilowatt returns less than the last.
This is not an argument for installing small. It is an argument that system size should come from your consumption pattern — how much electricity your home actually uses between 9am and 5pm — rather than from roof area or a rebate ceiling.
Three Ways to Waste Fewer Credits
1. Shift loads into daylight hours
Washing machines, dryers, pool pumps, EV chargers, water heaters — all of these can be scheduled. Use timers or the appliance’s own scheduling to run them while the panels are producing. Every kWh moved from night to day converts a low-value credit into a full-value saving.
2. Check whether Time-of-Use fits
If your household can shift load with discipline, a ToU scheme can widen the gap between day and night rates further. It does not suit everyone — it penalises peak-hour usage — so it is a decision to calculate rather than assume.
3. Consider a battery
A battery stores daytime surplus for night use, so that energy never becomes an export credit that can expire. Under NEM, batteries were hard to justify because the grid already acted as free storage. Under Solar ATAP the arithmetic changes. Whether it pays depends on battery cost, the size of your evening gap, and how long you plan to stay in the house.
Who Is Most Affected by Expiring Credits
- Homes empty during the day. Both adults working out, children at school — low daytime load, high export.
- Homes with oversized systems. Sized to the roof rather than to consumption.
- Seasonal households. Hometown properties or second homes empty for weeks at a time.
- Low evening consumption. If night imports are small, there is nothing to absorb daytime credits.
If your home falls into any of these, the answer is not to skip solar. The answer is that system size and usage strategy need to be designed properly from the start.
Solar ATAP Credits and Your Other Numbers
The credit rule is one piece. Read these to complete the picture:
Frequently Asked Questions About Solar ATAP Credits
What homeowners ask most about the credit rules:
The Basic Rules
Do Solar ATAP credits really expire every month?
Yes. Export credits not used by the end of the billing period lapse. They do not carry into the next month and they are not paid out as cash. This differs from NEM, where credits could accumulate.
What is each exported unit worth?
For domestic customers it is credited at your tariff’s energy charge rate — not the full retail rate you pay on imported energy. That rate is tiered by monthly consumption. For non-domestic customers the basis is the average System Marginal Price.
Can I ask for a cash payout on surplus credits?
No. Credits can only be offset against your bill. There is no cash withdrawal option under Solar ATAP.
Why was this rule changed?
Solar ATAP terms are set out in Energy Commission guidelines. We will not speculate about the policy intent behind them — what can be verified is the terms themselves.
Practical Impact
Does this mean I should install a smaller system?
It means system size should follow your daytime consumption rather than your roof area. For some homes that means a smaller system; for homes occupied during the day, a full-size system still makes sense.
Does a battery solve this?
A battery stores daytime surplus for evening use, so that energy never becomes a credit that can expire. Whether it pays depends on battery cost against the value recovered each month. It is a calculation, not an automatic yes.
What happens if I travel for a month?
Generation continues, consumption is near zero, and most of that month’s credits are likely to be forfeited. Under NEM those credits could carry into the month you returned. Under Solar ATAP they cannot.
Does this affect my existing NEM system?
No. Systems already registered under NEM continue on their original contract terms until that contract expires. Solar ATAP rules apply to new installations.
Want the full mechanism first? Read our complete Solar ATAP Malaysia guide. Want a rough savings estimate? Use the Solar ATAP savings calculator.
Do not design a system by guesswork
We read the real consumption pattern in your bill and show how much would be self-consumed versus exported.
This page explains Solar ATAP programme terms in general based on published guidelines, including GP/ST/No. 60/2025. Terms and tariff rates can change. Confirm the current position with TNB or a SEDA-registered installer.
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