Understanding Your Electricity Bill After Going Solar
Switching to solar changes your electricity bill significantly. Instead of simply consuming power from the grid, you're now both producing and consuming β with excess exported back. This guide decodes every line item on your post-solar SP Group bill.
Post-Solar Bill Overview
- π Grid consumption: What you draw from SP Group
- π Solar generation: What your panels produce
- π Self-consumption: Solar used immediately
- π Export: Excess solar sold to grid
- π Net bill: Grid consumption minus export credits
Key Line Items Explained
Electricity Charges
Energy Charges: Measured in kWh at your contracted rate (S$0.30-0.32/kWh for standard plans). Post-solar, this reflects only grid-drawn electricity, not total consumption.
Grid Export Credits: Under the Grid Integration Program, excess solar is credited at S$0.20/kWh. This appears as a negative line item reducing your bill.
Network and System Charges
These fixed costs remain regardless of solar:
- Transmission charge: S$0.02-0.03/kWh
- Market support services: S$0.01-0.02/kWh
- Market administration: S$0.001/kWh
Market Development and System Operation
Fixed monthly charges that don't change with solar adoption.
Sample Bill: Before and After Solar
| Line Item | Before Solar | After Solar (8 kW) |
|---|---|---|
| Consumption | 1,200 kWh | 400 kWh (grid) |
| Energy Charges | S$360 | S$120 |
| Export Credit | S$0 | -S$40 |
| Network Charges | S$36 | S$12 |
| Fixed Charges | S$15 | S$15 |
| Total Bill | S$411 | S$107 |
Verifying Your Solar Savings
Cross-Checking Production Data
Your monitoring app should show monthly production. Compare:
- Total generation vs. bill export + estimated self-consumption
- Export kWh on bill vs. monitoring app export data
- Calculated savings vs. actual bill reduction
Expected Savings vs. Actual
If savings are significantly lower than projected:
- Check for shading or soiling issues
- Verify inverter is operating normally
- Ensure net meter is recording exports correctly
- Contact your installer for performance review
Argyle Solar offers bill analysis services to verify your solar performance.
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