Photovoltaic Power Station Construction · Engineering Sectors
Photovoltaic (PV) power plant construction refers to the systematic engineering process that uses solar PV modules as the core energy conversion component, and through supporting infrastructure—including mounting structures, inverters, combiner boxes, step-up substations, and transmission lines—converts solar radiation into electrical energy for grid connection or local consumption. By construction scale and grid connection mode, PV plants are typically classified into three major categories: centralized ground-mounted plants, distributed rooftop plants, and off-grid/microgrid plants. By project phase, the scope covers the full lifecycle: site selection assessment, feasibility study, design, procurement, construction, commissioning, grid connection, and operations & maintenance (O&M).
Regarding the rationale for this guide, the global energy transition and "dual carbon" goals have propelled solar PV to become the fastest-growing power source. As the primary force behind Belt and Road energy cooperation, Chinese state-owned enterprises (SOEs) have undertaken numerous PV projects across Southeast Asia, the Middle East, Africa, Central Asia, and Latin America. These projects face several common challenges: first, fragmented standards—IEC, IEEE, Chinese GB, European EN, and host-country local codes coexist; second, climatic and geological variations—extreme heat, sand and dust, high humidity, salt spray, and seismic zones impose special requirements on equipment and structures; third, complex grid connection and commercial environments—weak host-country grids, widely varying PPA terms, and prominent currency and tax risks. Therefore, establishing a systematic construction knowledge framework is not a "nice-to-have" for overseas EPC contractors—it is a "survival necessity."
Regarding scope of application, this guide applies to centralized and distributed PV EPC/PC projects undertaken by SOE overseas contractors, covering the entire process from bid decision-making to handover and O&M. It is particularly applicable to integrated "design-procurement-construction" delivery models. For pure equipment supply or pure construction subcontracting, relevant sections may be referenced.
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Site selection determines the upper limit of energy generation. Overseas projects require particular attention to the following factors:
| Assessment Dimension | Key Indicators | Common Risks |
|---|---|---|
| Solar resource | GHI/DNI, annual utilization hours | Unreliable data sources, soiling attenuation |
| Land conditions | Slope, bearing capacity, land classification | Ownership disputes, land acquisition cost overruns |
| Grid access | Distance to interconnection point, short-circuit capacity | Weak grid, curtailment |
| Climatic environment | Temperature extremes, wind speed, salt spray level | Equipment derating, accelerated corrosion |
| Policy environment | Feed-in tariff, tax incentives, foreign exchange controls | Policy changes, exchange rate losses |
It is recommended to adopt satellite data + ground measurement + third-party consulting as triple verification to avoid single-source data bias. For desert and Gobi projects, special attention must be paid to soiling losses and cleaning water supply issues.
Overseas PV design requires finding a balance among Chinese standards, IEC standards, and host-country standards. Key points:
Checklist: Mandatory Items at Design Stage
1. Host-country mandatory certifications and grid connection codes
2. Local seismic, wind resistance, and fire protection codes
3. Equipment customs clearance and tariff classification
4. Local supply capability for spare parts
5. O&M access routes and cleaning plans
The core contradiction in overseas construction is the conflict between Chinese efficiency and local conditions. Typical issues include: labor quota restrictions, insufficient local subcontractor capability, long customs clearance cycles, and monsoon/high-temperature work stoppages.
| Management Dimension | Recommended Practice |
|---|---|
| Schedule management | Build in buffer periods for customs clearance and rainy seasons; front-load critical path activities |
| Quality management | Establish ITP inspection plans; third-party witness at critical milestones |
| HSE management | Comply with local regulations and IFC Performance Standards |
| Localization | Train local technicians; build localized management teams |
| Supply chain | Procure core equipment domestically; localize auxiliary materials |
Grid connection is the critical juncture where a PV project transitions from construction to operation. At the technical level, the following must be completed: inverter joint commissioning, SVG/reactive power compensation testing, power quality testing, protection setting verification, and dispatch communication integration. At the commercial level: grid connection agreement signing, tariff determination, metering point confirmation, and power purchase agreement effectiveness.
Common bottlenecks: Low efficiency of host-country grid companies, last-minute changes to grid connection standards, and incompatible metering devices. It is recommended to clearly define grid connection responsibility boundaries and delay compensation mechanisms in contracts.
PV plants have a lifespan of 25+ years, and O&M quality directly determines investment returns. The challenges of overseas O&M include: insufficient local O&M team capability, long spare parts supply cycles, and unstable remote monitoring communications.
Recommended configuration: SCADA remote monitoring system + local O&M crew + regional spare parts warehouse. At handover, the following must be completed: as-built documentation, operation manuals, training records, spare parts lists, and warranty letters. For PPA projects, attention must also be paid to energy generation guarantee clauses and availability factor assessments.
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| Comparison Dimension | Chinese GB Standards | International Standards (IEC/IEEE) | Host-Country Standards |
|---|---|---|---|
| Module certification | GB/T 9535 | IEC 61215/61730 | Mostly IEC adoption or localization |
| Grid connection requirements | GB/T 19964 | IEEE 1547/IEC 61727 | Highly variable; requires country-by-country verification |
| Structural design | GB 50009 | ASCE 7/EN 1991 | Often references European/American or local codes |
| Construction safety | GB 50794 | IFC Performance Standards | Local labor law takes precedence |
| Acceptance procedures | GB/T 50796 | IEC 62446 | Led by host-country grid company |
Practical principle: Use IEC as the technical foundation, Chinese standards as efficiency tools, and host-country standards as the compliance floor. When the three conflict, compliance takes priority; safety takes priority.
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Scenario 1: A Large Ground-Mounted PV Plant in the UAE
The Middle East features high temperatures, sand and dust, and high irradiance. Projects in this region commonly adopt bifacial modules + tracking systems + automated cleaning systems. Public reports indicate that Chinese SOEs have undertaken multiple gigawatt-scale PV projects in the Middle East, with core challenges being high-temperature derating and dust cleaning. The lesson from such projects: equipment selection should include temperature margins, and cleaning strategies should be designed in tandem with water resource management.
Scenario 2: A Distributed PV Project in Southeast Asia
Southeast Asia features high humidity, high salt spray, and frequent typhoons. Rooftop distributed projects must focus on corrosion protection, wind resistance, and roof load-bearing capacity. Among publicly reported Belt and Road projects, Chinese enterprises have undertaken multiple industrial park rooftop PV installations in Vietnam, Thailand, and Malaysia. Characteristics of such projects: low grid connection voltage levels, high requirements for matching owner's electricity load profiles, and construction windows heavily affected by production schedules.
Scenario 3: An Off-Grid/Microgrid PV Project in Africa
Some areas in Africa have weak or nonexistent grids, making off-grid PV + energy storage a viable solution. Public reports show that Chinese enterprises have undertaken multiple "PV + storage" microgrid projects in Africa for power supply to mining sites, villages, or industrial parks. The core of such projects: energy storage configuration optimization, load forecast accuracy, and local O&M capability building.
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Q1: Which set of standards should be prioritized for overseas PV projects?
A: Use IEC as the technical baseline, satisfy host-country mandatory requirements, and reference Chinese standards for design and construction efficiency. Contracts must specify the priority hierarchy of standards.
Q2: How to address grid connection difficulties caused by weak host-country grids?
A: Conduct grid stability analysis during the design phase, configure SVG/energy storage, and clearly define grid connection responsibilities and delay clauses in contracts. When necessary, assist the owner in promoting grid upgrades.
Q3: What are the most common pitfalls in equipment selection for overseas projects?
A: Neglecting local climate adaptability (e.g., high-temperature derating, salt spray corrosion) and certification requirements (e.g., host-country mandatory certifications). It is recommended to complete the certification checklist and climate verification in advance.
Q4: How to control schedule risks in overseas construction?
A: Build in buffer periods for customs clearance, rainy seasons, and labor quotas; procure key equipment domestically and localize auxiliary materials; establish localized construction crews.
Q5: What is most easily overlooked during O&M handover?
A: Spare parts lists and localized supply plans, SCADA communication stability, training records for local O&M teams, and assessment mechanisms for PPA energy generation guarantee clauses.
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1. Front-load standard integration: Complete a gap analysis of Chinese, IEC, and host-country standards at the bidding stage to form a project-specific standards checklist.
2. Climate adaptability verification: Verify equipment and structural design margins item by item against high temperature, sand and dust, high humidity, salt spray, and seismic conditions.
3. Clarify grid connection responsibilities: Define grid connection responsibility boundaries, delay compensation, and grid upgrade cost-sharing in contracts.
4. Phased localization: Train local technicians during construction; establish localized crews during O&M to reduce long-term costs.
5. Dual-track supply chain: Procure core equipment domestically to ensure quality; localize auxiliary materials and consumables to ensure schedule.
6. Digital O&M first: SCADA + remote monitoring + regional spare parts warehouses to compensate for slow overseas O&M response.
7. Compliance and HSE as the floor: Strictly comply with host-country labor laws, environmental regulations, and IFC Performance Standards to avoid compliance risks.
8. Standardized documentation and handover: Archive as-built documentation, operation manuals, training records, and spare parts lists using unified templates to ensure traceability.
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Conclusion: Overseas PV power plant construction is essentially a four-fold integration of technology, standards, commerce, and culture. The core competitiveness of SOE EPC contractors lies not in single-point technical leadership, but in systematizing scattered standards, experience, and resources into a replicable, deliverable, and operable overseas engineering capability.