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The Sunollo Savings Guarantee: What It Is, How It Works, and What It Covers

The Core Promise Sunollo's Savings Guarantee for subscription customers is a single, clear commitment: Over any full 12-month period from your commissioning anniversary, the value

The Core Promise

Sunollo's Savings Guarantee for subscription customers is a single, clear commitment:

Over any full 12-month period from your commissioning anniversary, the value of electricity your Sunollo system saves you — calculated at SP Group's published rates — will exceed the total subscription fees you have paid for that period.

In plain terms: your solar system should put more money back in your pocket than the subscription costs you. If it does not, Sunollo will make up the difference.

The Guarantee Formula 
Annual Gross Savings
= Σ (Monthly kWh self-consumed × SP purchase rate for that quarter)
+ Σ (Monthly kWh exported × SP NER export rate for that quarter)

Annual Net Savings
= Annual Gross Savings − Total Subscription Paid (12 months)

Guarantee Condition: Annual Net Savings > SGD 0

Both SP rates are independently published by SP Group each quarter. Sunollo uses the exact rates in force during each billing period — not an average or estimate. You can verify both rates on your SP monthly bill and at spgroup.com.sg.

A Full 12-Month Worked Example

The table below shows a sample year for a 10 kWp system with a SGD 100/month subscription. SP rates are indicative (based on published quarterly rates) and change each quarter.

Annual Net Savings = SGD 392.68 — Savings Guarantee met with SGD 392.68 to spare.

When the Guarantee Would Be Triggered

Here is an example of a year where Sunollo's guarantee would result in a customer credit:

Scenario: Same 10 kWp system, SGD 100/month subscription. During the year: (a) the household spent 4 months abroad with minimal daytime appliance use, reducing self-consumption significantly; and (b) a monsoon season was unusually prolonged, reducing generation.

Annual Net Savings = SGD 1,376 − SGD 1,200 = SGD 176. Guarantee still met in this case.

If gross savings fell to, say, SGD 1,140 against SGD 1,200 subscription, the shortfall would be SGD 60. Sunollo would credit SGD 60 to the customer's account or deduct it from the next subscription payment.

What the Guarantee Does NOT Cover — Exclusions

The Savings Guarantee is designed to be fair to both the customer and to Sunollo. There are specific circumstances where the guarantee conditions cannot be met through no fault of the solar system or Sunollo, and in these cases the guarantee is either suspended or adjusted:

1. Material Change in Usage Patterns

The system was sized and the subscription was priced based on your historical electricity consumption profile provided at the time of evaluation — typically your SP bills from the previous 12 months.

If your consumption changes materially from the evaluation baseline, the savings model no longer applies to the original assumptions. Examples of material changes:

  • Number of occupants in the home drops significantly (family moves out, long-term travel abroad)
  • Major energy-consuming appliances are permanently removed (e.g., pool heater, server room)
  • Property becomes vacant for extended periods
  • A significant new high-consumption use is added that was not modelled (e.g., commercial activity, data centre equipment)

Threshold: A change is considered "material" if your total annual electricity consumption (grid import + solar self-consumption) differs from the evaluation baseline by more than 35%.

This exclusion protects the integrity of the guarantee — it is designed to ensure the system's output matches your needs, not to protect against your usage simply falling (which would reduce your savings but also reduce your actual electricity spend).

2. Physical Changes That Materially Affect Generation

The system's generation was modelled based on your roof's solar access at the time of installation. If a physical change significantly reduces sunlight reaching your panels, the guarantee cannot be held to the original projection. Examples:

  • Construction of a new building or structure adjacent to your property that casts shade on your panels during peak generation hours
  • Growth of trees (beyond your control) that now shades panels
  • Structural changes to your own roof that altered panel positioning
  • Any addition, removal, or modification to the solar system made without Sunollo's written consent

If you are aware of a significant physical change affecting your panels, notify Sunollo as soon as possible. We will reassess your production baseline and update your guarantee calculation accordingly.

3. System Downtime for Maintenance or Repair

Periods during which the solar system is legitimately offline are excluded from the guarantee calculation. This includes:

  • Scheduled preventive maintenance conducted by Sunollo — periods during which Sunollo has notified you that the system will be offline
  • Repair periods after a reported fault — from the date you notify Sunollo of a fault to the date the system is confirmed operational again
  • Grid outages — periods during which SP Group's grid is unavailable (anti-islanding shutdown)

For each day the system is offline for these reasons, the prorated daily generation target is excluded from the annual guarantee calculation. Sunollo will document all such periods in your Annual Savings Statement.

4. Force Majeure Events

Events beyond reasonable control — including natural disasters, floods, fire (not caused by the solar system), or government-ordered shutdowns — that prevent the system from operating are excluded from the guarantee period.

How the Annual Assessment Works

The guarantee is assessed once per year, on the anniversary of your commissioning date. Here is the process:

  1. Data collection — Sunollo retrieves 12 months of generation data from your monitoring platform (inverter-level data) and cross-references with your SP billing data to confirm export earnings.
  2. Rate application — SP's published quarterly rates are applied to each billing period. These are the same rates that appear on your SP bills — there is no Sunollo-specific pricing.
  3. Exclusion adjustments — Any documented downtime periods, confirmed material usage changes, or physical changes are noted and the affected periods are excluded or adjusted in the calculation.
  4. Annual Savings Statement issued — Sunollo sends you a detailed statement showing the full calculation, month by month, with the result clearly stated: Guarantee Met / Guarantee Shortfall.
  5. If shortfall exists — Sunollo issues a credit equal to the shortfall amount, applied to your next subscription payment.
Your Rights and Transparency

Sunollo is committed to full transparency in the savings calculation:

  • You can check your savings calculation at any time using your monitoring app and SP bill — all inputs are publicly verifiable
  • If you disagree with any figure in your Annual Savings Statement, you have 30 days from issue date to raise a query. Sunollo will review and respond within 14 working days
  • All SP rates used in calculations are the official published rates — they are the same for all Sunollo customers and are not adjusted or interpreted by Sunollo
  • Your commissioning date and baseline consumption data are documented in your contract and retained by Sunollo — you can request a copy at any time
Frequently Asked Questions

What if my SP tariff rate goes up — do my guaranteed savings increase?

Yes. Because savings are calculated at the prevailing SP purchase rate each quarter, a tariff increase directly increases the value of your self-consumed solar energy. Your gross savings will be higher without any change to your system.

What if the NER rate goes down?

The NER export rate is market-linked (USEP-based) and can vary. If it falls, the value of your exported energy decreases. However, self-consumed energy is calculated at the purchase rate (not NER), so maximising self-consumption reduces your exposure to NER rate changes.

What if I go on holiday for a month?

Holiday periods are not excluded from the guarantee calculation unless your absence reduces consumption so dramatically that it crosses the 35% materiality threshold for the full year. A single month of lower consumption typically has a small effect on the annual total. Sunollo recommends programming timers on appliances to run during daytime solar hours even when you are away, to maintain self-consumption.

What if a new building blocks my panels?

If a new structure is constructed that materially reduces your solar generation (not caused by you), Sunollo will reassess your production baseline and update the guarantee parameters. For changes not caused by the customer, Sunollo will also assist you in documenting the impact for any potential compensation claim against the developer.

Can I see the calculation myself before the annual statement?

Yes. Your monitoring app shows monthly generation, self-consumption, and export. Combined with your SP bill's NER credit and tariff information, you can replicate the calculation at any time. Sunollo can also provide a mid-year indicative summary on request — contact support@sunollo.com.