This article analyzes hands-on implementation experience<\/strong>, details a 6-step EPC delivery process<\/strong>, outlines legal and regulatory compliance requirements in Vietnam<\/strong>, and provides practical guidance for evaluating EPC contractors based on key criteria<\/strong>. You will find: the end-to-end deployment process from site survey to operation, a contractor evaluation checklist, and the essential legal requirements applicable to FDI solar projects.<\/p>\n Contractor experience refers to a capability profile demonstrating that an EPC contractor has successfully delivered comparable solar power projects<\/strong>. For FDI projects in Vietnam, qualified contractor experience typically includes:<\/p>\n Long-term experience in the renewable energy sector<\/p>\n<\/li>\n A substantial total installed and commissioned capacity<\/p>\n<\/li>\n A project portfolio serving both domestic and international clients<\/p>\n<\/li>\n International certifications: ISO 9001, ISO 14001, ISO 45001<\/p>\n<\/li>\n Documentary evidence: commissioning records, site photos, acceptance certificates<\/p>\n<\/li>\n<\/ul>\n According to standards issued by the International Finance Corporation (IFC)<\/strong> of the World Bank Group, EPC contractors for renewable energy projects must demonstrate experience through completed projects of comparable scale<\/strong>. This requirement is especially critical for FDI projects, where expectations for quality, compliance, and international standards are significantly higher.<\/p>\n The difference between domestic and international standards lies primarily in the level of documentation detail<\/strong>. While domestic projects may accept Vietnamese-language documentation, many FDI corporations require technical documents and contracts in English<\/strong>, often accompanied by ESG reports aligned with GRI standards<\/strong>, depending on the parent company\u2019s internal policies, along with compliance with international safety standards.<\/p>\n Inexperienced contractors often lack a clear understanding of environmental approval procedures (EIA)<\/strong>, Vietnam Electricity (EVN) grid connection approvals<\/strong>, and investment licensing requirements<\/strong>. This can result in severe project delays. In practice, many projects have encountered difficulties due to incomplete environmental documentation or procedural errors during the permitting phase.<\/p>\n Experienced contractors are typically able to accurately forecast system performance<\/strong> based on real operational data. The Performance Ratio (PR)<\/strong> is a key indicator measuring actual operational efficiency against theoretical output. According to the International Energy Agency (IEA)<\/strong> and operational data across Southeast Asia, rooftop systems designed by experienced contractors commonly achieve a PR of approximately 80\u201385%<\/strong>.<\/p>\n Most large FDI corporations enforce strict ESG (Environmental, Social, Governance)<\/strong> requirements and maintain renewable energy usage policies. Many corporations choose to use I-REC (International Renewable Energy Certificate)<\/strong> as a tool to verify green electricity consumption. EPC contractors must therefore have experience preparing ESG documentation aligned with international standards<\/strong>.<\/p>\n Correct equipment selection from the outset significantly reduces Operation & Maintenance (O&M)<\/strong> costs over the system\u2019s lifecycle. Tier-1 modules from Trina Solar, Canadian Solar, JA Solar, and LONGi Solar<\/strong> typically offer long-term warranties and stable performance degradation profiles.<\/p>\n To comprehensively assess EPC contractor capability, FDI enterprises should evaluate the following six core criteria:<\/p>\n Long-term experience in the solar energy sector is critical, as Vietnam\u2019s solar market has undergone multiple policy cycles. The market expanded rapidly from 2017 under the Feed-in Tariff (FIT) scheme, then transitioned to alternative models such as Direct PPA<\/strong> and self-consumption<\/strong> systems.<\/p>\n Warning signs to avoid:<\/strong><\/p>\n Newly established companies claiming extensive historical experience<\/p>\n<\/li>\n Experience concentrated mainly in civil construction rather than solar EPC<\/p>\n<\/li>\n<\/ul>\n Effective verification methods:<\/strong><\/p>\n Request business licenses and time-sequenced project portfolios<\/p>\n<\/li>\n Cross-check company information via the Vietnam Chamber of Commerce and Industry (VCCI)<\/strong><\/p>\n<\/li>\n<\/ul>\n Total installed capacity reflects both operational scale<\/strong> and accumulated technical experience<\/strong>. Contractors with large installed capacities typically enjoy stronger bargaining power with equipment manufacturers and broader exposure to diverse project types.<\/p>\n Verification methods:<\/strong><\/p>\n Request a project list with commissioning dates<\/p>\n<\/li>\n Cross-check with EVN grid connection approval records (for on-grid projects)<\/p>\n<\/li>\n Conduct site visits to completed projects to assess build quality<\/p>\n<\/li>\n<\/ul>\n FDI solar projects differ significantly from domestic projects. First, there are documentation requirements<\/strong> \u2014 all technical documents, contracts, and reports must be prepared in English<\/strong> and aligned with international standards. Second, FDI enterprises often require detailed ESG reporting<\/strong> to be submitted to the parent company.<\/p>\n Common FDI client groups in Vietnam include:<\/p>\n Japan<\/strong>: Electronics and manufacturing companies<\/p>\n<\/li>\n South Korea<\/strong>: Technology and textile conglomerates<\/p>\n<\/li>\n United States<\/strong>: High-tech enterprises<\/p>\n<\/li>\n Europe<\/strong>: Retail and manufacturing corporations<\/p>\n<\/li>\n<\/ul>\n Warning signs:<\/strong><\/p>\n Client portfolios consisting primarily of Vietnamese companies<\/p>\n<\/li>\n No references or testimonials from FDI clients<\/p>\n<\/li>\n<\/ul>\n Verification methods:<\/strong><\/p>\n Request a client list with contact information<\/p>\n<\/li>\n Directly contact FDI clients for references (where permitted)<\/p>\n<\/li>\n<\/ul>\n ISO certifications and international standards reflect the contractor\u2019s quality management system<\/strong>.<\/p>\n Required \/ commonly requested certifications:<\/strong><\/p>\n ISO 9001:2015<\/strong> \u2014 Quality management system<\/p>\n<\/li>\n ISO 14001:2015<\/strong> \u2014 Environmental management<\/p>\n<\/li>\n ISO 45001:2018<\/strong> \u2014 Occupational health and safety<\/p>\n<\/li>\n<\/ul>\n Recommended certifications:<\/strong><\/p>\n IEC 61730<\/strong> \u2014 Safety qualification for photovoltaic modules<\/p>\n<\/li>\n TCVN 10896:2015<\/strong> \u2014 National standard for ground-mounted thin-film photovoltaic (PV) modules, used to evaluate design quality and type approval<\/p>\n<\/li>\n<\/ul>\n Verification methods:<\/strong><\/p>\n Request certificate copies with validity dates<\/p>\n<\/li>\n Verify certificates via the issuing body\u2019s official website<\/p>\n<\/li>\n<\/ul>\n Strong financial health ensures that the contractor has sufficient resources to complete the project. Solar EPC projects typically involve milestone-based payment mechanisms<\/strong>, and financially weak contractors may struggle with advance funding.<\/p>\n Key financial indicators to assess:<\/strong><\/p>\n Stable annual revenue<\/p>\n<\/li>\n Reasonable debt-to-equity ratio<\/p>\n<\/li>\n Positive net profit<\/p>\n<\/li>\n<\/ul>\n Verification methods:<\/strong><\/p>\n Request audited financial statements for the last three years<\/p>\n<\/li>\n Obtain bank confirmation letters<\/p>\n<\/li>\n Require performance bonds issued by banks<\/p>\n<\/li>\n<\/ul>\n Long-term support commitments clearly differentiate professional EPC contractors<\/strong> from opportunistic ones.<\/p>\n Minimum requirements:<\/strong><\/p>\n Construction warranty: Typically 2 years<\/p>\n<\/li>\n Equipment warranty: Per manufacturer (inverters usually 10 years; modules usually 25 years)<\/p>\n<\/li>\n Performance warranty: Guaranteed Performance Ratio<\/p>\n<\/li>\n Response time: Clearly defined for different incident types<\/p>\n<\/li>\n O&M team: Dedicated technical personnel<\/p>\n<\/li>\n<\/ul>\n Warning signs:<\/strong><\/p>\n Warranty periods shorter than industry standards<\/p>\n<\/li>\n No dedicated O&M contract<\/p>\n<\/li>\n Full outsourcing of maintenance services<\/p>\n<\/li>\n<\/ul>\n A standard EPC (Engineering, Procurement, Construction) process for solar projects typically spans 4\u20136 months<\/strong>, including:<\/p>\n Steps 1\u20132 (Survey + Design): 4\u20136 weeks<\/p>\n<\/li>\n Step 3 (Permitting): 3\u20134 weeks<\/p>\n<\/li>\n Step 4 (Procurement): 4\u20136 weeks<\/p>\n<\/li>\n Step 5 (Construction): 8\u201312 weeks<\/p>\n<\/li>\n Step 6 (Commissioning): 1\u20132 weeks<\/p>\n<\/li>\n<\/ul>\n The objective of this phase is to assess technical and financial feasibility<\/strong>.<\/p>\n Key activities:<\/strong><\/p>\n 1.1. Site assessment<\/strong> 1.2. Shading analysis<\/strong> 1.3. Financial modeling<\/strong> 1.4. Risk assessment<\/strong> Deliverable:<\/strong> Feasibility report with a detailed financial model.<\/p>\n 2.1. System design<\/strong> 2.2. Electrical design<\/strong> 2.3. Structural design<\/strong> 2.4. 3D visualization<\/strong> Deliverable:<\/strong> Construction drawings, bill of quantities, and equipment technical specifications.<\/p>\n This is a critical step to ensure compliance with Vietnamese regulations.<\/p>\n 3.1. Investment license (for FDI projects)<\/strong><\/p>\n For rooftop systems installed on factories owned by the FDI enterprise and used for self-consumption, a new investment license is generally not required<\/strong>. 3.2. Environmental compliance<\/strong><\/p>\n For self-consumption rooftop systems, an Environmental Protection Commitment<\/strong> is typically sufficient.<\/p>\n<\/li>\n Grid-connected projects with capacity exceeding 3 MWp<\/strong> may require an Environmental Impact Assessment (EIA)<\/strong> in accordance with the Law on Environmental Protection 2020<\/strong> and Decree 08\/2022\/N\u0110-CP<\/strong>, subject to guidance from the local Department of Natural Resources and Environment.<\/p>\n<\/li>\n<\/ul>\n 3.3. Construction permit<\/strong> 3.4. Grid connection approval<\/strong> 3.5. Other permits<\/strong><\/p>\n Solar equipment is freely importable and does not require an import license. Deliverable:<\/strong> A complete permit and approval dossier in compliance with regulations.<\/p>\n 4.1. Supplier sourcing<\/strong> 4.2. Purchase orders<\/strong> 4.3. Logistics<\/strong> 4.4. Quality inspection<\/strong> Deliverable:<\/strong> Procurement log and delivery acceptance records.<\/p>\n 5.1. Resource mobilization<\/strong> 5.2. Mounting structure installation<\/strong> 5.3. Module installation<\/strong> 5.4. Electrical works<\/strong> 5.5. System integration<\/strong> Deliverable:<\/strong> Progress reports and site photographs.<\/p>\n 6.1. Pre-commissioning checks<\/strong> 6.2. Trial operation<\/strong> 6.3. Performance verification<\/strong> 6.4. Training & handover<\/strong> After understanding the evaluation criteria and EPC process, FDI enterprises can apply the following roadmap:<\/p>\n Phase 1 \u2014 Shortlisting (2 weeks)<\/strong> Phase 2 \u2014 Detailed evaluation (4\u20136 weeks)<\/strong> Phase 3 \u2014 Negotiation (2\u20133 weeks)<\/strong> Phase 4 \u2014 Contract execution & kickoff (1 week)<\/strong> Solar projects in Vietnam must comply with:<\/p>\n TCVN 10896:2015<\/strong> \u2014 National standard for ground-mounted thin-film photovoltaic (PV) modules, used to evaluate design quality and type approval<\/p>\n<\/li>\n QCVN 32:2015<\/strong> \u2014 Applicable to projects connected to the EVN grid (self-consumption rooftop systems are generally outside this scope)<\/p>\n<\/li>\n Construction Law 2014<\/strong> and related decrees<\/p>\n<\/li>\n Solar projects commonly apply Construction All Risks (CAR) insurance<\/strong> and third-party liability insurance<\/strong> in accordance with Circular 329\/2016\/TT-BTC<\/strong><\/p>\n<\/li>\n<\/ul>\n Priority should be given to Tier-1 equipment brands<\/strong>, including:<\/p>\n PV modules:<\/strong> Trina Solar, JA Solar, Canadian Solar, LONGi Solar<\/p>\n<\/li>\n Inverters:<\/strong> Sungrow, Huawei, SMA, Fronius<\/p>\n<\/li>\n<\/ul>\n These brands offer long-term warranties and are widely recognized by international financial institutions, according to rankings published by Bloomberg New Energy Finance (BNEF)<\/strong>.<\/p>\n Technical risks:<\/strong><\/p>\n Insufficient roof load-bearing capacity<\/p>\n<\/li>\n Shading from surrounding structures<\/p>\n<\/li>\n Substandard equipment quality<\/p>\n<\/li>\n<\/ul>\n
\nWhat Is Contractor Experience in FDI Solar Projects?<\/h2>\n
Internationally Accepted Definition<\/h3>\n
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\nWhy Must FDI Investors Rigorously Evaluate Contractor Experience?<\/h2>\n
Minimizing Legal and Compliance Risks<\/h3>\n
Ensuring Committed System Performance<\/h3>\n
Compliance with Corporate ESG Standards<\/h3>\n
Optimizing Long-Term Operating Costs<\/h3>\n
\nSix Mandatory Criteria for Evaluating Contractor Experience<\/h2>\n
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<\/p>\nOverview of the Six Criteria<\/h3>\n
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\n \nCriterion<\/th>\n Weight<\/th>\n Verification Method<\/th>\n<\/tr>\n<\/thead>\n \n Years of Experience<\/td>\n 15%<\/td>\n Business license, company profile<\/td>\n<\/tr>\n \n Total Installed Capacity<\/td>\n 20%<\/td>\n Project portfolio, commissioning records<\/td>\n<\/tr>\n \n Number of FDI Projects<\/td>\n 25%<\/td>\n Client list, site visits<\/td>\n<\/tr>\n \n International Certifications<\/td>\n 15%<\/td>\n Certificate copies, audit reports<\/td>\n<\/tr>\n \n Financial Stability<\/td>\n 10%<\/td>\n Financial statements, bank guarantees<\/td>\n<\/tr>\n \n After-Sales Support & O&M<\/td>\n 15%<\/td>\n Warranty terms, response-time commitments<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
\nCriterion 1 \u2014 Years of Experience<\/h2>\n
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\nCriterion 2 \u2014 Total Installed Capacity<\/h2>\n
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Criterion 3 \u2014 Number of FDI Projects<\/h2>\n
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\nCriterion 4 \u2014 International Certifications<\/h2>\n
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\nCriterion 5 \u2014 Financial Stability<\/h2>\n
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\nCriterion 6 \u2014 After-Sales Support & O&M<\/h2>\n
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\nInternational-Standard EPC Process: Detailed 6-Step Framework<\/h2>\n
Process Overview<\/h3>\n
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\nStep 1 \u2014 Site Survey & Feasibility Study (2 Weeks)<\/h2>\n
Engineering teams conduct site surveys, including roof structure inspections, measurement of usable installation areas, analysis of electricity bills to understand consumption demand, and evaluation of EVN grid connectivity.<\/p>\n
Use specialized software such as PVsyst<\/strong>, a widely adopted simulation tool in the solar industry and consistent with international engineering practices.<\/p>\n
Estimate capital expenditure (CAPEX), operating expenditure (OPEX), forecast electricity savings or sales revenue, calculate the payback period, NPV, IRR, and perform sensitivity analysis.<\/p>\n
Identify technical, legal, and financial risks.<\/p>\n
\nStep 2 \u2014 Engineering Design & Technical Development (2 Weeks)<\/h2>\n
Module layout on the roof, string configuration, and equipment selection from reputable brands (Trina Solar, JA Solar, Canadian Solar, LONGi for modules; Sungrow, Huawei, SMA for inverters).<\/p>\n
Single-line diagrams, cable sizing calculations, and design of protection devices and grounding systems.<\/p>\n
Calculation of mounting structure based on wind and seismic loads in accordance with Vietnamese standards.<\/p>\n
Create simulation visuals for client presentation.<\/p>\n
\nStep 3 \u2014 Permits & Legal Compliance (3\u20134 Weeks)<\/h2>\n
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Only when the enterprise intends to sell electricity or operate energy services may it be necessary to consider adding appropriate business lines.<\/p>\n\n
Most rooftop solar systems do not require a construction permit unless structural modifications affect the building\u2019s load-bearing structure.<\/p>\n
Submit documentation to EVN for grid connection approval (if electricity is sold).<\/p>\n
Only standard customs documents are required, including CO, CQ, invoice, packing list, and technical specifications.<\/p>\nStep 4 \u2014 Equipment Procurement (4\u20136 Weeks)<\/h2>\n
Issue requests for quotation (RFQs) to multiple suppliers and conduct both technical and commercial evaluations.<\/p>\n
Release purchase orders with milestone-based payment terms.<\/p>\n
Manage international transportation, customs clearance, and delivery to the construction site.<\/p>\n
Inspect equipment upon delivery for quantity, quality, and documentation compliance.<\/p>\n
\nStep 5 \u2014 Construction & Installation (8\u201312 Weeks)<\/h2>\n
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Set up site offices, prepare tools and equipment, and conduct occupational safety training.<\/p>\n
Prepare the roof and install rails and module mounting structures.<\/p>\n
Install modules according to design; perform DC connections and ensure proper cable management.<\/p>\n
Install inverters, route AC cabling, install protection devices, and complete grounding systems.<\/p>\n
Configure the monitoring system (if applicable).<\/p>\n
\nStep 6 \u2014 Testing, Commissioning & Handover (1\u20132 Weeks)<\/h2>\n
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Visual inspection, insulation resistance testing, grounding continuity testing, and polarity checks.<\/p>\n
Start up inverters, verify grid connection, check performance, and validate the monitoring system.<\/p>\n
Operate the system under real conditions, measure energy output, and compare results against design simulations.<\/p>\n
Provide operational training to client staff and hand over complete documentation, including as-built drawings, O&M manuals, and warranty certificates.<\/p>\n
\nContractor Selection Roadmap for FDI Enterprises<\/h2>\n
Identify potential contractors through partner referrals, online research, and industry conferences. Conduct initial screening based on websites, portfolios, and client reviews.<\/p>\n
Issue Requests for Information (RFI), request project lists and references. Conduct reference checks, site visits, and apply a scoring matrix for evaluation.<\/p>\n
Select the highest-scoring contractor for detailed negotiations on payment terms, warranties, schedule commitments, and delay penalties. Engage legal counsel to review the EPC contract.<\/p>\n
Sign the EPC contract, establish communication channels and reporting mechanisms, and conduct the project kickoff meeting.<\/p>\n
\nKey Considerations<\/h2>\n
Compliance with Vietnamese Standards<\/h3>\n
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\nSelection of High-Quality Equipment<\/h3>\n
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\nProject Risk Management<\/h3>\n
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