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Repowering or continued operation?

Shortly before or after the tariff ends, the question arises: keep running, replace individual parts or rebuild? The answer comes from comparing income values.

In short

Repowering pays off if the income value after the upgrade, minus the investment, is higher than the value from continued operation. For systems with a running tariff, a tariff-preserving module replacement can make sense; after the tariff ends, self-consumption usually decides.

Three options compared

Continued operationmaintenance only, inverter replacement on failureWhen it makes sense: good condition, low costs, self-consumption
Partial repoweringreplacing faulty modules or inverters, possibly adding storageWhen it makes sense: isolated damage, tariff still running
Full repoweringnew modules and inverters, often more capacity on the same areaWhen it makes sense: roof renovation due anyway, high self-consumption

What happens to the tariff

Since Germany's Solar Package I (16 May 2024), modules on buildings may be replaced without a defect and still keep the original tariff rate. It applies only to the share of electricity corresponding to the old capacity. Additional capacity receives the current tariff. The replacement must be reported (Clearingstelle EEG|KWKG, in German). We check whether the conditions are met in the individual case before valuing.

How we compare

  1. Income value from continued operation, with a realistic decommissioning year
  2. Income value after repowering, with new capacity, tariff split and self-consumption
  3. Investment, removal of old modules, downtime
  4. Difference between both values minus investment, with sensitivity to electricity price and yield

For the first option, the calculator gives an order of magnitude. We calculate the comparison with repowering in the report.

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Frequently asked questions

Does repowering a PV system pay off?

If the value after the upgrade minus the investment is higher than with continued operation. Typical triggers are damage, a roof renovation that is due anyway or high self-consumption.

Do I keep the old tariff when replacing modules?

For systems on buildings, since Solar Package I generally yes, for the share of electricity from the original capacity. The replacement must be reported.

Last updated: 2026-09-24