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How to Check Your Solar Savings on a Subscription Plan

Two Ways Your Solar Subscription Saves You Money On a Sunollo solar subscription, your savings come from two sources every day the sun shines: Self-consumption savings — Solar ener

Two Ways Your Solar Subscription Saves You Money

On a Sunollo solar subscription, your savings come from two sources every day the sun shines:

  1. Self-consumption savings — Solar energy your home uses directly, which displaces grid electricity you would otherwise have purchased from SP Group at the prevailing tariff rate.
  2. Export earnings (NER) — Excess solar electricity you send to the grid, which SP Group credits back to you at the published Net Energy Rebate (NER) rate.

Your subscription fee is a fixed monthly amount agreed at the start of your contract. Your net saving each month is the sum of these two benefits minus that fee.

The Savings Formula

Sunollo calculates your savings using this formula, based entirely on SP Group's published rates:

Monthly Gross Savings
= (kWh self-consumed × SP purchase rate)
+ (kWh exported × SP NER export rate)

Monthly Net Savings
= Monthly Gross Savings − Monthly Subscription Fee

Both the SP purchase rate and the NER export rate are publicly published by SP Group each quarter and are not set by Sunollo. You can verify the current rates at spgroup.com.sg.

Understanding the Two SP Rates

Note: Self-consumed solar is worth roughly 2–3× more per kWh than exported solar, because it saves you the full retail purchase rate rather than earning only the wholesale NER rate. This is why maximising daytime appliance usage increases your savings.

A Step-by-Step Example

Here is a worked example for a typical Singapore home with a 10 kWp Sunollo system and a SGD 100/month subscription:

Sample Month (April)

Calculation

Self-consumption savings  = 400 kWh × SGD 0.299  = SGD 119.60
Export earnings (NER)     = 350 kWh × SGD 0.21  = SGD  70.35
─────────────────────────────────────────────────────────────
Monthly Gross Savings                              = SGD 189.95
Monthly Subscription Fee                           = SGD 100.00
─────────────────────────────────────────────────────────────
Monthly Net Savings                                = SGD  89.95 ✓

In this example, the customer saves SGD 89.95 above what they pay Sunollo — money they would otherwise have paid SP Group.

Why Savings Change Every Month

Your gross savings are not fixed — they vary naturally with:

  • Sunlight availability — generation is higher in sunny months and lower during heavy monsoon periods
  • Your household usage patterns — more daytime appliance use means more self-consumption and higher savings per kWh generated
  • SP tariff changes — SP Group revises tariffs quarterly; if the purchase rate rises, your savings per self-consumed kWh increase automatically
  • NER rate changes — the USEP-based NER rate changes quarterly, affecting the value of your grid export

Some months — especially during monsoon season (November–January and June–July) — will generate fewer savings than others. This is why Sunollo evaluates the guarantee annually, not monthly, using the full 12-month picture.

How to Check Your Own Savings

You can verify your savings at any time using three data sources:

1. Your Monitoring App

Open iSolar Cloud, FusionSolar, or SolarEdge and check:

  • Monthly generation (kWh) — total solar output
  • Self-consumption (kWh) — portion used by your home directly
  • Export (kWh) — portion sent to the grid

2. Your SP Group Monthly Bill

Your SP bill shows:

  • Electricity imported from grid (kWh) — your residual grid usage after solar
  • Net Energy Rebate credit (SGD) — the export earnings credited by SP Group
  • Current applicable tariff rate

3. Your Pre-Solar Baseline

Sunollo retains a copy of your electricity consumption data from the evaluation stage. Comparing your current monthly bill to your pre-solar average gives you a simple real-world savings check.

Your Annual Savings Statement

On the 12-month anniversary of your commissioning date, Sunollo will send you an Annual Savings Statement that shows:

  • Total generation for the year (kWh), month by month
  • Total self-consumption and export, month by month
  • Gross savings calculated at SP's published quarterly rates
  • Total subscription paid for the year
  • Net annual savings — and whether the Savings Guarantee has been met

This statement is your primary reference for the guarantee assessment.