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The Linear Performance Guarantee 

With the introduction of the linear performance guarantee in 2011, SolarWorld became the first company in the sector worldwide to set a new guarantee standard. Instead of offering guarantees that end after 10 or 20 years like other manufacturers did, SolarWorld introduced the continually decreasing linear performance guarantee. This guarantees a maximum performance reduction of a fixed percentage over a period of 25 years. A minimum value is set for the output of the SolarWorld modules every year for a 25-year period. This means that the guaranteed performance of the solar module is higher at every point in time than with the standard tiered guarantee and therefore provides real added value. Today, the linear performance guarantee is standard for most manufacturers. 
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