Kerala Solar Surplus Settlement: APPC Rate ₹3.26 Explained
Kerala solar surplus settlement for net-metered prosumers is the payment you get when banked units remain at the end of the settlement period. KSERC set that rate using Average Pooled Power Purchase Cost, called APPC. For the surplus tied to the true-up of 2023–24, the approved APPC is ₹3.26 a unit. On 27 July 2026 the Commission rejected a petition that asked for ₹4.34 instead.
Quick answer: The regulator kept APPC at ₹3.26 a unit for settling net banked energy and disposed of the petition seeking ₹4.34. That figure comes from the true-up order dated 30 June 2025 in OP No. 49/2024, and the 27 July 2026 order in OP No. 52/2025 refused to reopen it. Your monthly bill export credit during the year is separate from this year-end surplus settlement.
What surplus settlement means for a Kerala solar home
Under net metering, units you export can offset units you import later in the settlement cycle. If a balance still sits in your favour at the end of that period, the licensee pays for that net banked energy at the APPC rate approved by KSERC. APPC means Average Pooled Power Purchase Cost. It is a regulator-approved average of the licensee's power purchase cost, not the retail slab rate on your bill.
APPC is not the same as the unit rate in your domestic slab. It is used for the leftover banked energy at settlement, not for every export unit during the year.
Kerala solar surplus settlement: the ₹3.26 APPC rate
In the true-up order dated 30 June 2025 in OP No. 49/2024, KSERC approved APPC at ₹3.26 a unit for settling net banked energy of prosumers and captive consumers. Four rooftop solar prosumers later filed OP No. 52/2025. They asked the Commission to use ₹4.34 a unit instead, arguing that figure followed the 2020 regulation method on the same year's accounts.
| Item | Amount | Where it appears |
|---|---|---|
| APPC approved for settlement (true-up path upheld) | ₹3.26 per unit | OP 49/2024 order dated 30.06.2025, affirmed in OP 52/2025 |
| Rate petitioners sought | ₹4.34 per unit | Prayer in OP 52/2025 |
| Base APPC used in the Commission's escalation method | ₹3.15 per unit (2022–23) | Discussion in OP 52/2025 |
| Order disposing the challenge | 27 July 2026 | OP No. 52/2025 |
On 27 July 2026 the Commission held the petition was not maintainable as a review of the 30 June 2025 order and, on merits, found no ground to reopen the APPC. The petition was disposed of. The ₹3.26 rate therefore remained the settlement figure under challenge.
Why the Commission kept ₹3.26 instead of ₹4.34
The Commission explained that 2023–24 was an abnormal monsoon and demand year for KSEB's power purchase cost. It had used the APPC of a more normal year, ₹3.15 a unit for 2022–23, and applied an escalation with CPI and WPI in the ratio 70:30 to arrive at ₹3.26 for the settlement under challenge. Paying the higher force-majeure-driven pooled cost to a small set of prosumers, it said, would load ordinary consumers.
The order also compared Kerala's ₹3.26 settlement rate with other states for 2024–25 surplus treatment. Several states paid less than ₹3.26, and some let leftover banked energy lapse. The Commission used that comparison to show that ₹3.26 was not low by national practice.
Daytime solar export helps the grid at noon. It does not remove KSEB's need to buy costly evening power. That timing gap is central to how the Commission discussed settlement value.
What this means on your bill and when cash is due
During the year, net metering adjusts export against import in the banking period. The APPC rupee rate becomes the talking point when a net credit remains at the end of the settlement period. The older 2020 net-metering framework, as quoted in the order, also spoke of interest if the licensee delays payment beyond 30 days from the settlement date, at FBIL rate plus 200 basis points on 1 April of the settlement year.
- Check whether your plant is still billed under net metering.
- Note the settlement period end date printed in your prosumer documents or bill notes.
- Ask the section office for the APPC rate used for your settlement credit.
- If a credit is due and delayed past 30 days from the settlement date, ask how interest is applied under the rules that govern your agreement.
How the 2025 renewable-energy regulations sit beside this rate
Kerala has since notified the KSERC (Renewable Energy and Related Matters) Regulations, 2025. Energy accounting, billing and settlement chapters under those regulations apply from 1 January 2026. Existing prosumers continue under net metering subject to Regulation 2.3. The July 2026 APPC dispute was about the rate already fixed in the 2023–24 true-up path, not about rewriting the whole metering framework.
If you expanded your plant or changed inverter after the 2025 regulations took effect, ask whether any new settlement clause in those regulations applies to your agreement in addition to the APPC rupee rate. The July 2026 order settles the rate dispute; it does not rewrite every metering contract by itself.
For a homeowner, the practical reading is simple. Do not assume surplus at year-end will be paid at your retail slab rate. The settlement number under the challenged true-up path is ₹3.26 a unit unless a later order sets a new APPC for a later year.
What to ask KSEB if you expect a surplus credit
- What APPC rate applies to my settlement period ending date?
- How many banked units remain after adjustments?
- Will the amount be paid to my bank account or adjusted in bills?
- From which date does any interest for delay start, if payment is late?
Keep copies of your net-metering agreement, recent bills showing export and banked units, and any settlement advice. If the numbers on a settlement note do not match ₹3.26 for the period covered by the true-up order under challenge, ask the section office to show the Commission order they used.
Check this against your bill
FGE Solar can review your latest KSEB bill and tell you which system size is worth pricing.
Frequently Asked Questions
What is the APPC rate for year-end solar surplus payout now?
For the surplus settlement tied to the true-up path upheld in OP No. 52/2025, KSERC kept APPC at ₹3.26 a unit. On 27 July 2026 it rejected a petition that sought ₹4.34 a unit. Later years need their own approved APPC.
Is ₹3.26 the same as my domestic unit rate?
No. Domestic energy charges follow the tariff slabs on your bill. APPC is a separate regulator-approved average used to pay leftover banked energy at settlement. It is usually much lower than higher domestic slabs.
Can prosumers force KSEB to pay ₹4.34 a unit?
Not through the petition decided on 27 July 2026. KSERC held that case was not maintainable as a review and found no merit to reopen the ₹3.26 APPC. Only a fresh lawful process for a later year could set a different rate.
When do I actually receive the surplus money?
After the settlement period ends and the licensee works out net banked units. The older rules quoted in the order speak of payment within 30 days of the settlement date, with interest if late. Ask your section office which timeline applies to your agreement.
Does this change monthly net-metering billing?
No. Monthly import–export adjustment during the banking period continues under your net-metering arrangement. The APPC figure is about leftover banked energy at settlement, not every export unit each month.
Official Sources and Accuracy Note
- 01KSERC Order dated 27.07.2026 in OP No. 52/2025 (APPC for settling net banked energy of prosumers)
Petition for ₹4.34/unit rejected; APPC ₹3.26/unit stands for settling surplus banked energy.
govt source · opened 2026-09-26 - 02KSERC (Renewable Energy and Related Matters) Regulations, 2025
Regs 6.1–6.3 net-metering capacity and storage; Reg 28.7 interim grid support charges.
govt source · opened 2026-09-26 - 03KSERC Tariff Order dated 05.12.2024 (OP No. 18/2023), tariff schedule and ToD annexures
LT-I Domestic fixed-charge slabs w.e.f. 01.04.2025 to 31.03.2027.
govt source · opened 2026-09-26
Accuracy note: This guide is built from government pages, regulator orders, and news sources on the web. Rules and amounts change. Some details may be outdated or wrong. Check the official links below before you pay, apply, or complain to KSEB.