Solar Rooftop in Rayong for Factories and Industrial Estates
Rooftop solar engineered for Rayong's heavy industry — sized to your roof, your daytime load, and your PEA tariff.
Rayong sits at the core of the Eastern Economic Corridor, home to Map Ta Phut, Amata City Rayong, and Hemaraj Eastern Seaboard. Factories here run high daytime loads, which makes rooftop solar one of the cleanest ways to lower energy cost per unit. We design systems against your actual bill and roof.
PPA vs EPC: which model fits your factory
Under a PPA, Bustan Energy funds, builds, and maintains the rooftop system, and you simply buy the solar power at a rate below grid — no upfront capital. Under EPC, you own the asset outright for the strongest long-term return. We model both against your Rayong load profile so the choice is financial, not guesswork.
- PPA: zero capex, discounted solar tariff, we own O&M
- EPC: full ownership, fastest payback over the asset life
- Side-by-side cash flow and IRR for your facility
- Hybrid and battery options for shift-based operations
Built around your PEA tariff
Most Rayong industrial sites are served by the Provincial Electricity Authority (PEA) on TOU or demand-based tariffs. The value of rooftop solar depends heavily on how your peak and off-peak rates line up with daytime generation. We read your bill structure first, then size the array to maximize self-consumption, not just kilowatt-peak.
- Analysis built on your PEA TOU and demand charges
- Self-consumption-first sizing for daytime industry
- Guidance on metering and grid-connection paperwork
- Clarity on what solar offsets and what it cannot
Roof and load assessment
Rayong factory roofs vary widely — metal sheet, aging structures, and large logistics spans all behave differently. We assess roof condition, orientation, shading, and structural capacity, then match the system to your real consumption curve. The goal is a system that performs for 25 years, not one that looks good only on a brochure.
- Structural and roof-condition review before design
- Shading and orientation analysis for your site
- Load-curve matching to avoid oversizing
- Long-term yield and degradation expectations
Industrial estates we serve
We work with tenants and owners across Rayong's major estates, including Map Ta Phut Industrial Estate, Amata City Rayong, Hemaraj Eastern Seaboard, and RIL. Each estate has its own utility setup and roof types, so we tailor the design and the connection process to where your facility actually sits within the EEC.
- Map Ta Phut and Eastern Seaboard facilities
- Amata City Rayong tenants and owners
- Hemaraj and RIL industrial plots
- Multi-building and warehouse-portfolio rollouts
Frequently asked questions
How much can a Rayong factory save with rooftop solar?
Savings depend on your roof area, daytime load, and PEA tariff. We never quote a flat figure — send your bill and we model the real offset and payback for your specific facility before you commit.
Do I need to invest capital upfront?
Not necessarily. With a PPA, we fund and build the system and you buy the power at a discounted rate. With EPC you own it outright. We model both so you choose on the numbers.
Will solar cover my entire factory's electricity?
Usually it offsets a meaningful share of daytime consumption rather than 100%. Rooftop area and load timing set the ceiling. We size for the best self-consumption value, not an unrealistic full offset.
How does the PEA connection process work?
Industrial rooftop systems require metering and grid-connection approvals with the Provincial Electricity Authority. We handle the technical documentation and guide you through the steps for your Rayong site.
Is my factory roof suitable for solar?
Most Rayong industrial roofs are, but condition and structure matter. We assess your roof's age, material, orientation, and load capacity before designing anything, so the system lasts its full life.
See what rooftop solar does for your Rayong facility
Send your latest PEA electricity bill and we'll return a load review with PPA and EPC options sized to your roof.