Solar PPA for Business

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.

💰0 THB Upfront🛡️15-25 yr Guarantee🔧Full Service Included

Try the PPA Comparator Free Consultation

80+

MWp Installed

150+

Projects Delivered

100+

Satisfied Clients

85K

Tons CO₂ Reduced/yr

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.

Read the full PPA guide →

PPA vs Self-Investment (EPC) — Side by Side

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.

Dimension

PPA

EPC

Upfront Investment

0 THB — no investment

3-30M THB depending on size

Electricity Savings

10-30% from day one

50-70% after 4-7 yr payback

Ownership

Provider owns the system

You own the system 100%

Contract Term

15-25 years

No binding contract

Maintenance

CapSolar handles everything

Your responsibility / hire O&M

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.

Send my bills for free assessment →Or analyse your bill yourself with our Bill Analyzer →

Read the commercial factory solar guide →

CapSolar PPA — 5 Steps from Signing to Savings

01Site Survey + Load Analysis

1-2 weeks

CapSolar 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 week

We 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 weeks

CapSolar 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 weeks

Our 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 onwards

From 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

PPA agreement providing immediate cost savings for an automotive parts manufacturer. Zero investment from the client with guaranteed electricity rate reduction.

Samut Prakan Warehouse

Sector: Logistics
System Size: 3.2 MW
Savings: 32%
COD Year: 2025

One of our largest PPA projects, utilizing the extensive rooftop of a logistics hub. The flat roof design maximized solar panel coverage and energy output.

Chiang Mai University Campus

Sector: Education
System Size: 1.2 MW
Savings: 26%
COD Year: 2025

PPA installation across multiple campus buildings, demonstrating solar viability for educational institutions with limited capital budgets.

View all PPA projects →

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?

Yes — 100% legal and regulated by the Energy Regulatory Commission (ERC). The PPA provider must hold an energy-business licence and obtain interconnection approval from PEA or MEA. The customer (you) does not need to apply for any licence — CapSolar handles all paperwork. Systems at 1 MW or smaller typically fall under the VSPP / self-consumption track, which is faster than the large-scale process. Permitting usually takes 4-8 weeks.

Q2.What is the CapSolar PPA rate per kWh?

Our PPA rate is typically 2.50-3.20 THB/kWh, depending on system size, your load profile (how much daytime consumption you have), and contract length. That's about 25-40% below the current PEA/MEA TOU tariff, so the savings start immediately. The exact rate requires a site survey and 12-month bill analysis — but you can use our free PPA Comparator first to get a directional estimate.

Q3.What happens if I sell the factory before the PPA contract ends?

You have 3 options — fully flexible, no lock-in: (1) The new owner can take over the PPA via a simple amendment letter (this is the most common path, since a below-market PPA is actually a selling point for the building); (2) you can buy out the system at the residual value pre-defined in the contract; or (3) you can have CapSolar remove the system (a removal fee applies, also pre-defined). There is no surprise termination penalty — every option is written into the contract from day one.

Q4.Does PPA work for leased premises?

Yes — with two conditions: (1) the remaining lease should be 15 years or longer to cover the PPA term, and (2) you need written landlord consent. We then sign a tripartite agreement (landlord + tenant + CapSolar) covering rooftop installation and maintenance rights, plus what happens if the tenant changes mid-contract. Our legal team will negotiate with your landlord at no extra cost.

Q5.What happens if CapSolar goes out of business before the contract ends?

PPA system assets are typically held in a Special Purpose Vehicle (SPV) financed by a bank. So if anything happens to CapSolar, the rights pass to a successor or receiver per the contract — O&M continuity and your fixed PPA rate are protected. You can also negotiate step-in rights or an early buy-out option upfront, giving you the right to take over the system at fair market value should the unexpected occur.

Q6.Can PPA work alongside Net Metering in Thailand?

Thailand currently has no full Net Metering scheme for commercial and industrial customers. There is only Net Billing for residential users, which exports surplus to PEA/MEA at a lower buy-back rate. C&I PPA in Thailand is therefore behind-the-meter — solar feeds your in-building load only, not the grid. If you want to export surplus, you'd need a separate VSPP or SPP licence, which is more complex and slower to permit.

Q7.If we already have BOI privileges, is PPA still worth it?

Absolutely. PPA reduces your energy operating expense (OpEx), which is a saving entirely independent of BOI tax benefits. Most BOI privileges are corporate income tax holidays, which lower CIT but don't reduce electricity cost — so a PPA improves margin on top. Some BOI-promoted businesses can also claim CIT deduction on energy CapEx if they go EPC. With PPA, the value sits in OpEx savings plus ESG signalling for supply chains tightening Scope 2 reporting.

Q8.How does PPA's ROI compare to EPC?

It depends on perspective: PPA has zero ROI period — savings start day one, but the percentage is smaller (10-30%). EPC has a 4-7 year payback, then full 50-70% savings over the rest of system life. On 25-year NPV, EPC usually wins on total value, but it requires large upfront CapEx, investment risk and your own O&M management. The choice between models comes down to (1) capital availability, (2) risk appetite, and (3) intended hold period — use our PPA Comparator to model your specific scenario.