Government Office Rayong
Project Overview
The Challenge
This government office complex in Rayong houses multiple administrative departments. As a public facility on taxpayer-funded budgets, management needed to reduce electricity costs while demonstrating leadership in Thailand's carbon neutrality goals. The project navigated strict public procurement regulations including Wor.Yor. 56 structural certification, competitive government bidding, and EGAT/PEA interconnection standards — a higher regulatory bar than typical commercial installations.
System Design & Engineering
CapSolar designed a 500 kW rooftop EPC system covering 3,200 sqm, utilizing 860 Tier-1 monocrystalline panels. The system was engineered for the building's 8 AM to 5 PM operational hours when air conditioning, lighting, and office equipment create peak demand. Self-consumption optimization was the primary design goal since government facilities cannot sell excess power back to the grid. A ballasted mounting system minimizes roof penetrations on the concrete deck. All structural calculations were certified by a licensed engineer to meet Wor.Yor. 56 requirements.
Energy Performance & Savings
The system generates 680 MWh of clean electricity annually, achieving a 30% reduction in electricity costs. At current PEA government tariff rates, these savings meaningfully reduce the operating budget — funds redirected to public services. ROI is 5–7 years, well within the system's 25+ year lifespan. Generation peaks between 10 AM and 2 PM, when HVAC systems work hardest in Rayong's tropical climate. Excess generation on weekends is minimized through careful system sizing matched to weekday base loads.
Environmental Impact
The installation eliminates 408 tons of CO₂ per year. While smaller than industrial-scale projects, this reduction is significant for a public building and directly supports Thailand's government-sector carbon neutrality mandates. The visible solar panels also demonstrate the government's commitment to clean energy, encouraging adoption among private enterprises and other agencies in Rayong.
Why This Project Matters
This project proves that government solar in Thailand can navigate complex public procurement while delivering strong returns. The strict compliance — from Wor.Yor. 56 certification to PEA grid interconnection — establishes a proven pathway for other public buildings considering solar EPC. For government facility managers across Thailand, this case study shows that solar delivers 30% savings while supporting national sustainability commitments within existing procurement frameworks.
