Hillcrest
Retail Park
145 kWp rooftop grid-tie solar installation serving a retail property in Johannesburg — generating 232 MWh annually and delivering R510k in first-year electricity cost savings.
145 kWp
System Size
Rooftop Grid-Tie
232 MWh
Annual Production
Estimated year 1
209 t/yr
CO₂ Offset
Carbon reduction
Partnership
Financing
Agreement structure
Johannesburg,
Gauteng
This Hillcrest retail property in Johannesburg serves a steady stream of customers throughout the day, creating consistent and predictable electricity demand that aligns well with solar generation hours. The facility's trading profile and roof area made it a strong candidate for a grid-tie solar installation.
Operating on an LV-TOU tariff structure, the property benefits significantly from offsetting consumption during standard and peak tariff periods. The 145 kWp system displaces a substantial portion of the site's daytime demand, reducing monthly electricity bills and improving operating margins.
The installation was designed to complement existing building infrastructure without requiring major modifications, ensuring a smooth commissioning process and immediate financial benefit from day one of operation.
Location
Johannesburg, Gauteng, South Africa
Sector
Retail — Commercial Property
Financial Performance
5 yrs
Payback Period
Simple payback
22%
IRR
Internal rate of return
R2.20
Blended Tariff
Per kWh (LV-TOU)
R510k
Est. Annual Savings
Year 1 projection
Monthly Production
kWh generated across rooftop installation
Monthly Cost Savings
Estimated Rand savings at R2.20/kWh blended tariff
Tariff Structure
LV-TOU (Low Voltage Time-of-Use)
Tariff Year
2023/24
Specific Yield
1,600 kWh/kWp
Load Shedding Factor
No load shedding assumed
Full-Scope Solution
Energy Solution
- Grid-tie solar PV
- Rooftop mounted system
- 145 kWp total installed capacity
- Generator integration included
- No battery storage required
EPC & Compliance
- Structural sign-off
- Electrical Pr. Eng sign-off
- Electrical COC
- Lightning risk assessment
Ongoing Services
- Full O&M Contract
- Asset Management Reporting
- Independent Check Metering
- Carbon Credits
- Insurance
Technical Specifications
Solar Panels
- Manufacturer
- Longi Solar
- Model
- LR5-66HPH-500M
- Panel Capacity
- 500 W
- Cell Technology
- N-Type Mono PERC
- Supplier
- Magneto
Inverters
- Manufacturer
- Sungrow
- Model
- SG60CX-P2
- Type
- String Inverter
- Rated Power
- 60 kW
- Monitoring
- iSolarCloud Platform
Client Benefits
Energy Cost Savings
R510k in estimated first-year savings by displacing LV-TOU grid electricity with clean solar generation during peak trading hours.
Grid Independence
Reduced exposure to Eskom tariff increases with predictable solar energy costs and a 5-year simple payback period.
Carbon Reduction
209 tonnes of CO₂ offset per year supporting ESG reporting and environmental sustainability commitments.
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