On-site renewable generation is the production of electricity at a site using renewable energy sources, most commonly solar PV (rooftop, carport, ground-mount) and, in some locations, wind or other renewables. In EV charging, it is used to supply part of charging demand with locally generated clean power, reducing grid imports and supporting sustainability targets.
Why on-site renewable generation matters for EV charging
Charging can significantly increase a site’s electricity consumption. On-site renewables can:
– Reduce energy costs by increasing self-consumption and lowering purchased kWh
– Improve sustainability performance and support net-zero charging strategies
– Mitigate grid constraints when paired with managed charging and storage
– Reduce exposure to volatile electricity prices and demand charge risk (site-dependent)
– Increase site attractiveness for tenants, employees, and fleets
Common renewable generation options at charging sites
– Solar PV rooftop systems on offices, depots, retail sites
– Solar carports above parking bays (often combined with charging bays)
– Ground-mount PV on available land near logistics yards or industrial sites
– Small wind (site-specific; more common in open rural/industrial locations)
– Renewable microgeneration integrated into a broader microgrid design
How on-site renewables integrate with charging operations
On-site renewables are typically coordinated through controls and metering:
– Direct use: charging sessions consume PV output in real time (“self-consumption”)
– Export/import: surplus generation exports to the grid; shortfalls are imported
– Solar-following managed charging shifts charging to midday generation peaks
– On-site battery buffering stores surplus PV for evening or peak charging
– Site limits enforced via load management (maximum import/export constraints)
Key design considerations
– Match generation profile to charging demand (workplace daytime demand aligns well with PV)
– Evaluate grid export rules and connection limits before sizing the system
– Use accurate metering and data to track renewable share and self-consumption
– Consider shading, roof structure, fire safety, and maintenance access
– Plan for phased expansion as EV adoption grows at the site
– Define how renewable claims are accounted for in reporting (site-level vs corporate)
Benefits
– Lower operational emissions and improved ESG reporting inputs
– Better economics when combined with smart charging and time-of-use tariffs
– Reduced peak grid import when paired with storage and demand management
– Enhanced resilience options when part of a microgrid architecture (where allowed)
Limitations and challenges
– Intermittent output (seasonal and weather-dependent)
– Space constraints and permitting for large PV installations
– Limited benefit without load shifting or storage if charging demand peaks at different times
– Upfront capex and long-term maintenance requirements
– Carbon claims can be misunderstood if boundaries and accounting are not defined
Related glossary terms
On-site generation
Renewable integration
Managed charging
Load management
On-site battery buffering
On-site energy storage
Peak shaving
Microgrid
Net-zero charging
Green power purchase agreement (PPA)