Solar PPA Service for Thai Businesses — Zero Upfront, Zero CAPEX
Let CapSolar install a commercial solar system on your rooftop at zero cost. You only pay for the electricity you use — at a rate 10-30% below the PEA/MEA grid tariff — for the entire 15-25 year contract. Design, permitting, installation and 25-year O&M are all on us.
Published 2026-04-22 · Last updated 2026-04-30 · Reviewed by the CapSolar Team
What is PPA? A 30-Second Summary
A PPA (Power Purchase Agreement) is a model in which the provider invests in, installs, owns and maintains the solar system on your rooftop. You purchase only the electricity it produces, at a rate below your normal grid tariff — no installation fee, no engineering fee, no maintenance fee.
Think of it like the lease-versus-buy decision for a car. Buying outright (the EPC equivalent) requires a large lump-sum payment but you own the asset. Leasing (the PPA equivalent) needs no capital — you simply pay a monthly rate that is lower than a financing payment, you use the energy from day one with no financial risk, and at the end of the contract you can typically buy the system at a much-reduced residual value.
Why Choose PPA Over Self-Investment?
Before committing to PPA, we recommend comparing it directly with self-investment (EPC). Each model fits a different business profile — if you want to own the asset outright and have capital available, EPC delivers the highest long-term return. If you need immediate savings without affecting cash flow, PPA is the better fit. The table below summarises the five dimensions that factory owners and CFOs use to decide.
Read the full comparison: EPC vs PPA — What's the Difference? 12-Dimension Guide
Plug in your numbers → see the answer in 30 seconds
The CapSolar PPA Comparator shows exactly how much your business will save under each model. Compare cash flow, IRR, payback period and NPV across the full 25-year horizon.
Use the PPA Comparator (free) →Is PPA Right for Your Business?
PPA is not for every business. It typically fits organisations with high daytime electricity consumption, a roof that can carry the load, and a long-term plan for the site. Use the checklist below to gauge whether your business fits the PPA profile. If you are unsure, our team will review 12 months of electricity bills for free and reply within 3 working days.
PPA Fits If
- Factories or buildings with monthly electricity bills of 100,000 THB or more
- Available roof area of at least 1,000 sqm (fits a ~150 kW system or larger)
- You own the building, or you have a lease of 15 years or longer
- You want to start saving immediately without committing capital
- ESG, carbon reduction, RE100 or CBAM compliance is a priority
May Not Fit If
- Monthly electricity bill below 50,000 THB (size is uneconomic for PPA)
- Short-term leased premises with less than 10 years remaining
- Old, damaged or under-spec roof structure that cannot bear the load
- You have capex available and want to own the system — choose EPC instead
Not sure? Send us 12 months of electricity bills for a free assessment — reply within 3 working days.
CapSolar PPA — 5 Steps from Signing to Savings
01Site Survey + Load Analysis
1-2 weeksCapSolar engineers visit your site, survey the rooftop, measure solar irradiance, and analyse 12 months of PEA/MEA bills to size the system precisely against your real load — neither over- nor under-sized.
02Design + PPA Proposal
1 weekWe deliver a transparent proposal: system size in kW, PPA rate in THB/kWh, annual escalation rate, projected savings over 20-25 years, and end-of-contract buy-out options — all open-book, with no surprises.
03PPA Signing + Permitting
4-8 weeksCapSolar handles all interconnection approvals from PEA or MEA, registers with the Energy Regulatory Commission (ERC), secures DEDE certification where required, and prepares both the PPA and interconnection agreements. The paperwork is entirely on us.
04Installation + Commissioning
4-12 weeksOur installation crews handle everything: mounting structure, Tier-1 panels, string or central inverters, AC/DC wiring, monitoring system, then grid-tie testing and formal Commercial Operation Date (COD) declaration.
05Start Using + 25-Year Monitoring
from COD onwardsFrom the COD onward you simply pay the agreed PPA rate — no lump sum, no repair fees, no panel-cleaning charge. CapSolar handles all O&M, runs 24/7 remote monitoring, sends a monthly performance-ratio report, and guarantees production against the contract.
Total timeline from first contact to first kWh: typically 4-7 months, depending on system size and permitting.
Real PPA Projects We've Delivered
Chonburi Factory Complex
- Sector
- Manufacturing
- System Size
- 1.8 MW
- Savings
- 28%
- COD Year
- 2024
## The Challenge This automotive parts manufacturer in Chonburi's Eastern Seaboard industrial zone operates CNC machining centers, stamping presses, and assembly lines that run two shifts daily. Electricity represents one of the factory's largest operating expenses, and with PEA tariffs rising 3–5% annually, the operations director needed a way to reduce energy costs without diverting capital from production equipment upgrades. Additionally, Tier-1 OEM customers including Toyota and Honda had begun requiring documented ESG compliance from their supply chain partners, making carbon reduction a business necessity rather than an optional initiative. ## System Design & Engineering CapSolar deployed a 1.8 MW solar PPA system across 8,500 sqm of rooftop, installing 3,100 Tier-1 monocrystalline panels. Under the PPA model, CapSolar financed, installed, and maintains the entire system at zero cost to the manufacturer. The string inverter layout matches the factory's two-shift consumption pattern, with generation peaking when CNC machines and compressed air systems draw maximum power. Panel tilt angles were optimized for Chonburi's latitude, and all rooftop penetrations were waterproofed to factory insurance specifications. ## Energy Performance & Savings The system generates 2,400 MWh of clean electricity annually. The manufacturer pays only for solar electricity consumed, at a rate 28% below the PEA grid tariff — immediate savings from day one with no upfront investment, no maintenance responsibility, and no technology risk. Because the PPA rate is fixed while grid tariffs climb, effective savings increase over time. The factory's daytime production schedule aligns naturally with solar generation, achieving self-consumption rates above 85%. ## Environmental Impact The installation reduces CO₂ emissions by 1,440 tons per year. For an automotive parts supplier, this carbon reduction directly supports compliance with the EU Carbon Border Adjustment Mechanism and Japan's Green Transformation requirements. The documented emissions data strengthens the factory's position in OEM supply chain audits, where environmental performance increasingly influences supplier selection. ## Why This Project Matters This project illustrates how solar PPA removes the two biggest barriers for manufacturing factories: upfront capital and technical risk. The zero-investment structure allowed this Chonburi automotive factory to achieve 28% electricity savings while meeting supply chain ESG mandates. For manufacturing facilities across Thailand's Eastern Seaboard facing similar cost and compliance pressures, this case demonstrates that solar PPA delivers measurable returns from the first month of operation.
Samut Prakan Warehouse
- Sector
- Logistics
- System Size
- 3.2 MW
- Savings
- 32%
- COD Year
- 2025
## The Challenge This large-scale logistics hub in Samut Prakan operates cold-chain storage, cross-docking facilities, and distribution management around the clock. Refrigeration units and climate-controlled warehousing create substantial electricity demand that peaks during the hottest hours of the day. The facility operator wanted to reduce energy costs but could not commit capital expenditure to a solar system, as available funds were allocated to warehouse expansion and fleet modernization. A zero-investment solution aligned with the building lease structure was essential. ## System Design & Engineering CapSolar deployed a 3.2 MW solar PPA system across 18,000 sqm of the warehouse's flat, unobstructed roof. The expansive, uniform surface is ideal for solar: no chimneys, limited mechanical protrusions, and minimal shading throughout the day. A total of 5,500 Tier-1 monocrystalline panels were installed at optimal tilt angles for Samut Prakan's latitude. The PPA contract was structured to align with the warehouse lease term, addressing a common concern for logistics operators who do not own the buildings they occupy. CapSolar retains ownership of the system and handles all maintenance, insurance, and performance monitoring. ## Energy Performance & Savings The system generates 4,300 MWh of clean electricity annually, reducing the facility's grid electricity costs by 32% with zero upfront investment. At current PEA industrial tariff rates, the fixed PPA rate delivers immediate savings that grow each year as grid tariffs rise. The cold-chain cooling load creates a natural synergy with solar generation — refrigeration compressors work hardest between 11 AM and 3 PM when ambient temperatures peak, exactly when solar output is at maximum. This alignment drives self-consumption rates above 88%, meaning nearly all generated electricity is used on-site. ## Environmental Impact The installation eliminates 2,580 tons of CO₂ per year, making it one of the highest-impact projects in the CapSolar portfolio by carbon reduction. For a logistics operator serving multinational supply chains, documented carbon reduction data supports Scope 2 emissions reporting and strengthens the facility's position in sustainability-conscious supply chain partnerships. The equivalent impact is approximately removing 560 vehicles from the road annually. ## Why This Project Matters This project demonstrates that large rooftop solar PPA in the logistics sector delivers exceptional economics due to the natural alignment between warehouse cooling loads and solar generation peaks. The lease-aligned PPA structure solves the ownership challenge that prevents many warehouse operators from adopting solar. For logistics and cold-chain facilities across Samut Prakan and greater Bangkok, this case study shows that solar PPA can achieve 32% cost savings at scale while supporting corporate sustainability reporting — all with zero capital investment.
Chiang Mai University Campus
- Sector
- Education
- System Size
- 1.2 MW
- Savings
- 26%
- COD Year
- 2025
## The Challenge This university campus in Chiang Mai operates classrooms, laboratories, administrative buildings, and common facilities across multiple structures. As a public institution, capital budgets go primarily to academic programs, leaving little room for infrastructure investments. Yet electricity costs for air conditioning, lab equipment, and campus lighting consumed an increasing share of the operating budget each year. The leadership also wanted to visibly demonstrate commitment to Thailand's carbon neutrality goals — making solar both a financial decision and an institutional statement. ## System Design & Engineering CapSolar designed a 1.2 MW solar PPA system distributed across multiple campus buildings, covering 6,800 sqm with 2,060 Tier-1 monocrystalline panels. Unlike factory installations, this required coordinating buildings with different roof types, structural capacities, and electrical systems. A centralized monitoring platform connects all arrays into a single PPA metering system, tracking electricity per building. Panel placement prioritized buildings with highest daytime occupancy — teaching halls and the administrative complex — while avoiding structures with insufficient roof capacity. The zero-investment PPA structure was essential: no capital expenditure, no maintenance, no technical risk. ## Energy Performance & Savings The system generates 1,650 MWh annually, achieving a 26% reduction in grid electricity costs. Classrooms and offices operate primarily 8 AM to 5 PM on weekdays, aligning with solar generation. Semester breaks mean lower self-consumption during those periods, but the PPA rate remains fixed below grid tariff regardless. The 26% savings free up budget the university redirects toward academic programs and student services. ## Environmental Impact The installation reduces CO₂ emissions by 990 tons per year, equivalent to planting approximately 45,000 trees. The visible solar panels serve as a practical teaching resource for engineering and environmental science programs, while positioning the university as a sustainability leader among Thai educational institutions. ## Why This Project Matters This project demonstrates that solar PPA is ideally suited for educational institutions that cannot allocate capital to energy infrastructure. The multi-building centralized metering solves the complexity of campus installations. For universities across Chiang Mai and Thailand, this case shows that zero-investment campus solar PPA achieves 26% savings while providing visible sustainability leadership and educational value — without adding a line item to the capital budget.
Why CapSolar is the Right PPA Partner
Truly Zero CAPEX
No hidden fees — no design fee, no permitting fee, no installation fee, no interconnection fee. CapSolar covers everything end-to-end. You pay zero baht before the system is producing.
Save 10-30% from Day One
Our PPA rate is lower than your PEA/MEA TOU tariff from the very first kWh. No payback period, no waiting — you see the savings in your first electricity bill.
Local Thai Team On the Ground
Headquartered in Bangkok with engineers and installers all on the ground. Emergency response within 24 hours, no waiting for overseas support. We speak Thai and know the PEA, MEA and ERC processes inside out.
25-Year Performance Guarantee
Contract-backed performance guarantee plus replacement warranty on panels, inverters and monitoring throughout the contract period. If output falls below the guaranteed level, CapSolar compensates the shortfall.
100% Transparent Open-Book
Open-book PPA contracts — you see the underlying cost stack, the annual escalation rate, the buy-out options at end of term, and the assignment clauses for ownership change. Everything is written and disclosed up front.
Calculate Before You Commit
We're the only Thai PPA provider that lets you compare PPA vs EPC online for free before you ever speak to a salesperson. 30 seconds gives you the real numbers, so you decide informed, not pressured in a meeting room.
Try the tool →Ready to start saving?
Talk to the CapSolar team →Frequently Asked Questions about Solar PPA
The 8 questions executives and CFOs ask us most before signing
Q1.Is Solar PPA legal in Thailand? What permits are required?
Q2.What is the CapSolar PPA rate per kWh?
Q3.What happens if I sell the factory before the PPA contract ends?
Q4.Does PPA work for leased premises?
Q5.What happens if CapSolar goes out of business before the contract ends?
Q6.Can PPA work alongside Net Metering in Thailand?
Q7.If we already have BOI privileges, is PPA still worth it?
Q8.What is PPA's ROI timeline?
Prefer to own the system? See our factory Solar EPC service →
Written and Reviewed by the CapSolar Team
Written by CapSolar's in-house engineering and advisory team — 80+ MWp installed across 150+ sites in Thailand, 15+ years combined team experience. Specializing in factory + commercial PPA structuring, grid interconnection, and 15-25 year contracts for Thai C&I buyers.
Technical review: CapSolar Engineering Lead (licensed electrical engineer, Thailand).
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