How can I check the performance of the community solar programme I’m part of?

Start by reviewing the annual performance reports provided by your scheme operator. These typically include energy generation data, financial returns, and maintenance updates. If unavailable, request them directly or check online portals linked to your project.

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Key metrics to monitor

• Energy output (kilowatt-hours generated monthly/annually) versus projections
• Financial returns per share/unit compared to original estimates
• System uptime percentage (aim for >95% operational time)
• CO₂ savings calculated from your local grid’s carbon intensity

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Practical verification methods

Community-led audits

Organise a committee to:

1. Compare bills – Check if tariff payments match contractual agreements
2. Request meter readings – Some schemes provide real-time generation data via apps
3. Inspect maintenance logs – Well-maintained systems have fewer breakdowns

Digital tools

The Household and Community Solar Assessment Calculator (developed by Centre for Sustainable Energy) helps benchmark your system against regional averages. Its mapping interface can estimate expected performance for existing setups.

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Recent UK developments impacting checks

• Post-2023 FiT alternatives: Many community schemes now use Smart Export Guarantee (SEG) tariffs – verify payments align with current rates (4-12p/kWh as of 2024)
• Ofgem compliance: New transparency rules require operators to share performance data annually

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Common mistakes to avoid

❌ Ignoring seasonal variations – UK solar generates 70% of annual output between March-September
❌ Overlooking shading changes – New buildings/trees near panels require system re-optimisation
❌ Miscounting ‘community benefit’ funds – Ensure local projects receive agreed percentages (typically 5-20% of profits)

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Troubleshooting poor performance

1. Request an independent inspection – Certified installers can identify issues such as module degradation or inverter faults
2. Review weather-adjusted data – Use Met Office records to account for unusually cloudy years
3. Check for grid constraints – Some UK projects face export limitations during peak generation

For schemes using the paid-for mapping service mentioned in recent guidance, operators should provide detailed area-level performance comparisons to highlight underperforming arrays.