Private PPA: 18 Providers
A practical shortlist for factories comparing on-site solar services and contract responsibilities.
ION Energy
ION Energy offers Private PPA for businesses and factories, beginning with electricity-use and site information before developing a project approach and purchase terms. Its service information explains on-site generation alongside grid supply, making it an option for businesses comparing direct investment with a longer-term electricity purchase.
Supply load patterns, shutdown days and expansion plans, then request generation assumptions and the amount the factory is expected to consume. Discuss roof responsibilities, system care and end-of-term arrangements individually so the proposal reflects operations as well as available roof area.
AESOVATION
AESOVATION presents an on-site Private PPA approach alongside solar engineering for factories and commercial buildings. Its project guidance emphasizes daytime demand, rights to use the property and roof readiness before evaluating a proposal. This makes it an option to discuss when a business wants to establish engineering feasibility before comparing investment models.
Request the roof and electrical survey, generation estimate and a clear schedule of included costs. Identify the investor, electricity seller and maintenance provider separately. Confirm the billing method and options if the business moves or the agreement ends, so installation responsibilities and long-term obligations are evaluated together.
Banpu NEXT
Banpu NEXT distinguishes its PPA offering from system purchase and leasing packages. Its PPA package describes maintenance throughout the agreement and generation monitoring through the company’s systems. It is useful to explore when a factory wants to compare several solar procurement models with one provider.
Ask for quotations based on the same load profile and compare total costs over a consistent evaluation period. If battery storage is proposed, separate its price, maintenance duties and effect on the electricity agreement. Do not assume every feature in the broader product range is included in the PPA.
BCPG
BCPG participates in rooftop Private PPA projects and announced completion of a 17.5 MW portfolio acquisition in March 2026. This establishes its role as an investor and owner of generating assets, a useful consideration alongside the team that installs and operates a factory's system.
Ask which business unit accepts new project enquiries, what eligibility criteria apply and which legal entity would sign the agreement. Identify the asset owner, maintenance provider and escalation contact separately. Portfolio size alone does not establish whether a proposal suits your factory.
BECIS
BECIS provides Energy as a Service and operates on-site solar projects in Thailand. Its solar offering covers rooftops, carports, ground-mounted arrays and water surfaces, with remote monitoring. It is a relevant option for facilities with several installation areas or other energy systems that need to work together.
Ask which equipment and services fall under the electricity agreement and which require separate contracts, such as storage or energy management. Review interfaces with standby generators and the grid, responsibility for abnormal operating conditions and the safety requirements specific to the facility.
Cleantech Solar
Cleantech Solar documents corporate Solar PPA projects in Thailand. Its Siam Winery case describes financing, design, installation and maintenance throughout the agreement. This provides a practical starting point for factories seeking a developer that also takes responsibility for long-term system operation.
Request a work plan that fits the factory’s safety rules and production shutdowns, especially in food manufacturing or other controlled environments. Review generation alerts, maintenance reports and equipment replacement arrangements. Assess the operating service alongside the quoted electricity price.
ClearSun
ClearSun describes a model in which it funds a solar installation and sells the electricity to the customer for an agreed term. Its offering includes design, installation and system care, making it a candidate to assess when a factory wants to understand the service scope across the project lifecycle.
Request an itemised scope, warranty terms and details of the end-of-contract transfer advertised by the company. Specify the required condition at handover and costs after transfer, especially when comparing offers with different contract lengths or end-of-term arrangements.
Constant Energy
Constant Energy develops and manages solar projects for commercial and industrial customers. It offers Corporate PPA solutions and presents Thai projects using building surfaces and water areas. It is an option for businesses considering electricity procurement together with long-term management of the generating asset.
Specify the installation areas and any logistics or operational constraints when requesting a proposal. Ask for a construction plan that identifies production impacts, then check metering, insurance and incident contacts. This supports a comparison of both project delivery and service throughout the agreement.
Energy Green Plus
Energy Green Plus markets factory solar Private PPA services with long-term system care and options concerning equipment and contract duration. It is worth considering where a factory has detailed engineering requirements or wants to discuss the proposed equipment schedule.
Turn those advertised options into specific written offers: equipment models, replacement rules and pricing for each available term. Clarify roof work, insurance and maintenance shutdown responsibilities. A maximum discount in marketing material should not be treated as the expected saving for your own site.
Equator Solar Capital
Equator Solar Capital, or EQSC, describes a Private PPA service covering design, equipment investment, installation, maintenance and electricity sales. Its discussion of expandable and movable mounting structures provides a useful question for factories with available land or plans to change how their site is used.
Ask which installation arrangement is feasible at the actual location, including maintenance access, drainage and separation from production activities. If expansion or relocation is likely, request the approval process, cost allocation and effect on electricity pricing within the proposal.
GPSC
GPSC describes a Private PPA solar generation and distribution business involving solar farms and rooftops developed with public bodies and private companies. It is worth approaching when a factory wants to consider an electricity project within a broader, long-term corporate energy plan.
Confirm which unit accepts new enquiries, the types and sizes of facilities considered and the entity that would sign the contract. Separate the on-site system from any other energy services. Clarify responsibility for electrical connection work and coordination with the facility’s operating teams.
GreenYellow Thailand
GreenYellow Thailand presents Solar PPA alongside energy-efficiency services, with solar design, installation and maintenance. This makes it a relevant option to investigate when a factory wants to consider both electricity generation and changes to its energy consumption.
Keep the solar offer and efficiency work separately identifiable, and request a measurement method for each so that savings are not counted twice. If machinery upgrades will change consumption before commissioning, include the expected revised load in the solar assessment.
GUNKUL
GUNKUL presents a Private PPA service covering investment, site assessment, design, installation, commissioning and after-sales support. It describes performance monitoring throughout the agreement and serves several building types. This is an option for businesses assessing the full scope from engineering through ongoing operation.
Ask the proposal to identify responsibility and deliverables at each stage. Review commissioning records, the maintenance plan and the response to lower-than-expected generation. Check how electricity purchase obligations and factory shutdowns are treated in the draft agreement.
Impact Solar
Impact Solar offers Solar PPA alongside Solar Sale and Solar Lease packages. Under its PPA approach, the company invests in and maintains the system while the customer purchases electricity under the agreement. The alternatives help businesses compare ownership and operating responsibilities across procurement models.
Evaluate the options over the same period and request a breakdown of taxes, insurance and excluded costs. If the factory rents its premises or may sell the building, examine contract transfer, system purchase options and eligibility requirements for a successor before making a decision.
Kunini
Kunini describes a Private PPA covering finance, design, installation, operation and maintenance, potentially with an investment partner. Its service information includes factories and several commercial building types, making it a candidate to discuss a site containing production space and supporting buildings.
Verify the contracting entity and the team responsible for local service. Request the insurance scope, production monitoring and fault-response arrangements. For a multi-building site, distinguish meters and consumption profiles so that system sizing and billed electricity can be checked.
SCG Cleanergy
SCG Cleanergy develops and invests in renewable energy and provides industrial solar solutions. SCG has published examples of rooftop PPA projects with factories in Thailand. It is an option to discuss when an organization wants to consider an electricity project within a wider energy management strategy.
Separate the on-site Solar PPA proposal from additional technologies or services, such as smart grids or storage. Review metering, control arrangements and the operating data available to the customer. Confirm responsibilities if production processes change or the facility expands later.
Thai Solar Energy
Thai Solar Energy, or TSE, offers TSE SMART ENERGY PARTNERS for Private PPA, describing rooftop, ground-mounted, floating and carport installations. The range is useful to investigate when a factory has potential installation areas beyond its main roof.
Compare site conditions, maintenance access and the effect on existing operations for each arrangement. Ask for a proposal that separates responsibilities for each area and sets out the end-of-term handover advertised by the company. Every option still requires assessment of the actual location.
WHA Solar
WHA Solar describes a long-term PPA service covering surveys, design, permit applications, installation, operation and maintenance. It also presents centralized monitoring. It is a candidate for factories looking to review a complete project scope with continuing oversight of solar production.
Confirm service coverage and whether the company will assess your particular facility. Request a responsibility schedule for permits, electrical work and maintenance access. Clarify panel cleaning, inverter inspections and incident reporting so the long-term service can be assessed from the actual proposal.