Retail Runs Tight Margins — Electricity Is One of the Biggest Controllable Costs
Supermarkets and retail centres operate on thin margins where electricity is a major expense. Refrigeration runs 24 hours, lighting and air conditioning run through trading hours, and the building's common areas add further load. For Costa do Sol SPAR & Centre, rising Eskom tariffs were squeezing profitability year on year.
Specific pain points:
- High baseline electricity consumption driven by refrigeration, lighting, and HVAC
- Rising tariffs reducing retail margins in a competitive trading environment
- Large roof area on the shopping centre building available for solar
- Need to avoid disruption to trading during installation
144 kWp Grid-Tie — Aligned with Peak Trading Hours
Gentricity designed a 144 kWp grid-tie system sized for the centre's peak trading day:
System specifications:
- 144 kWp solar panel array on the retail centre roof
- Grid-tie inverter configuration optimised for daytime consumption offset
- System sized to cover a substantial portion of peak-hour electricity consumption
- Installation completed without disruption to trading operations
Why grid-tie was the right choice:
- Retail centres trade during daylight hours — solar generation aligns perfectly
- Refrigeration loads are continuous and substantial — offsetting them directly reduces bills
- No battery required for a retail operation with existing grid supply
- Simple system with low maintenance needs suits the retail management environment
Results (Estimated based on system specifications and industry benchmarks)
| Metric | Estimated Value |
|---|---|
| Daytime electricity cost reduction | 40–55% |
| Estimated annual savings | R500,000 – R700,000 |
| Payback period | 3–4 years |
| Section 12B Year 1 benefit | ~27.5% net cost reduction |
| System life | 25+ years |
Note: Figures are estimates based on system size and SA commercial solar benchmarks. Actual results may vary.
What This Project Demonstrates
For retail centres, shopping centres, and supermarkets:
- Large roof areas on retail buildings can support significant solar installations
- Daytime trading hours align with solar generation — maximising self-consumption
- Even without batteries, grid-tie delivers substantial savings on refrigeration and HVAC
- Installation can be completed without disrupting trading if properly planned
Relevant solutions: