PERC line conversion to TOPCon: 18 GW retrofitted in 2025–2026
Solar cell manufacturers globally have retrofitted approximately 18 GW of PERC cell lines to TOPCon capability in 2025–2026. Conversion economics work when residual PERC line life is 5+ years and ALMM/IRA market access matters. Per-GW conversion capex ranges from $25–45 million depending on existing line vintage and required equipment changes.
In 50 words: Solar cell manufacturers globally have retrofitted approximately 18 GW of PERC cell lines to TOPCon capability in 2025–2026. Conversion economics work when residual PERC line life is 5+ years and ALMM/IRA market access matters. Per-GW conversion capex ranges from $25–45 million depending on existing line vintage.
The market shift
Cell capacity conversions PERC → TOPCon, 2025–2026 cumulative:
- China: 12 GW converted
- India: 4 GW converted
- Vietnam, Thailand, Malaysia: 2 GW converted
Versus new TOPCon greenfield capacity additions of roughly 80 GW in the same period — conversion is meaningful but secondary to greenfield.
Why convert vs build new
Conversion economics work when:
- Existing PERC line has 5+ years of residual operational life
- ALMM, IRA domestic content, or local market access drives technology upgrade urgency
- Capital expenditure for full greenfield TOPCon line not justified
- Existing site has skilled operators trained on similar processes
Conversion capex
Per-GW conversion costs vary by:
- Existing PERC line vintage (2020+ lines easier, pre-2018 harder)
- Selectivity of equipment changes (full retrofit vs targeted)
- Process integration time and lost production
Typical range: $25–45 million per GW capacity. Compare to greenfield TOPCon: $80–95 million per GW.
What gets converted
A PERC line converted to TOPCon typically replaces or modifies:
- Doping equipment for poly-Si rear emitter formation
- Wet chemistry stations for selective passivation
- Metallization processes for n-type cell architecture
- Some characterisation and quality control equipment
What stays:
- Wafer handling and feeder systems
- Most cleanroom infrastructure
- Module assembly downstream
Indian context
Indian PERC-to-TOPCon conversions in 2025–2026:
- Waaree: 2 GW converted
- Vikram Solar: 1 GW converted
- Goldi Solar: 0.5 GW converted
- Premier Energies: 0.5 GW converted
Most Indian conversions driven by ALMM cell list expectations + export competitiveness.
What's still on PERC
Roughly 80% of operational PERC capacity globally remains on PERC because:
- Lines installed before 2020 are at end-of-life and not worth converting
- Domestic markets without ALMM-equivalent requirements still accept PERC modules
- Some specialist applications still favour PERC characteristics
What to watch next
PERC line shutdown decisions are the inverse of conversion decisions. The next 18 months will see meaningful PERC line retirements globally, particularly in China where new TOPCon greenfield capacity is increasingly displacing the older fleet.
Researched and drafted with AI assistance; reviewed and edited by the named editor within 24 hours of draft.