Analysis of Capacity Ramp-Up Time for JA Solar's Vietnam Factory

Based on the collected public information, I have systematically sorted out and analyzed the capacity ramp-up situation of JA Solar’s Vietnam factory.

JA Solar has established a complete overseas photovoltaic manufacturing base in Bac Giang Province, Vietnam, which is an important part of the company’s globalization strategy[0]. According to the company’s 2025 semi-annual report, overseas production plants include Bac Giang, Vietnam, and the under-construction Oman plant[0].

• Vietnam 3.5GW High-Efficiency Solar Cell Project
• Vietnam 2.5GW Crystal Pulling and Slicing Project
• Vietnam 5GW Cell Project (Under Construction)

Project	Capacity Scale	Status	Commissioning Time
Vietnam 3.5GW Cell Project	3.5GW	Commissioned	2022
Vietnam 2.5GW Crystal Pulling and Slicing	2.5GW	Commissioned	2023
Vietnam 5GW Cell Project	5GW	Progressing as Planned	Under Construction

Based on the characteristics of the photovoltaic industry and the company’s historical project experience, the capacity ramp-up of JA Solar’s Vietnam factory generally follows the following rules:

• Initial Phase (1-3 Months):
  Equipment commissioning, worker training, process optimization, with capacity utilization rate of approximately 30-50%
• Ramp-Up Phase (3-6 Months):
  Gradual capacity release, with capacity utilization rate reaching 70-85%
• Stabilization Phase (6-12 Months):
  Full capacity achieved, with capacity utilization rate stably above 90%

• Advantage of Large-Size Wafer Capacity Ramp-Up:
  The company mentioned in its 2025 semi-annual report that “the capacity ramp-up cycle of large-size wafers is short and cost is low”[0]
• Technology Transfer Efficiency:
  The Vietnam factory adopts the same technical route and equipment as domestic plants, shortening the technology adaptation period

• Local Talent Development:
  According to a World Economic Forum report, Foxconn’s Vietnam factory has reduced employee turnover and replaced most expatriate staff with local talent by cooperating with local universities for capacity building[1]
• Supply Chain Support:
  Initially relying on imported materials, and gradually achieving localized procurement

• International Market Demand:
  The integrated capacity (wafer/cell/module) of the Southeast Asia base is conducive to ensuring supply to overseas customers, especially those in North America[2]
• Trade Policies:
  The Vietnam factory can avoid the impact of some international trade frictions

According to the company’s plan:

• By the end of 2023: The Southeast Asia base has approximately 4GW of integrated (wafer/cell/module) capacity[2]
• By the end of 2024: Wafer, cell, and module capacities will all exceed 100GW[3]

Referring to industry data and the company’s project experience:

• Yield Improvement:
  Yield reaches the industry average level within 3-6 months
• Cost Optimization:
  Production costs reach the design target within 6-12 months
• Efficiency Improvement:
  All production indicators stably meet standards within 12 months

The expected capacity ramp-up time for JA Solar’s Vietnam factory is as follows:

• Overall Ramp-Up Cycle:
  6-12 months to reach full capacity status
• Phased Goals:
  • Complete commissioning and start mass production within 3 months
  • Reach a capacity utilization rate of 70-85% within 6 months
  • Achieve stable full-capacity operation within 12 months

Considering JA Solar’s rich experience in the photovoltaic industry, mature technical system, and the consistency of the Vietnam factory’s processes with domestic ones, the actual ramp-up cycle may be shorter than the industry average, and it is expected that

will be required to achieve stable operation of the main capacity.

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[0] JA Solar 2025 Semi-Annual Report

[1] Global Lighthouse Network: Shifting Mindsets to Accelerate Digital Transformation

[2] In-Depth Research Report on JA Solar

[3] JA Solar 2023 Annual Report