Marktprämie

How it computes

The anzulegender Wert, the applicable value, is the amount per kilowatt hour that the statute or a won auction assigns to an installation. The monthly market value is the volume-weighted average price solar power achieved on the exchange in that month. The premium is the difference between the two.

Because the second figure moves monthly while the first is fixed, the premium slides: when market value falls the premium rises, and the other way round. The sum of marketing revenue and premium stays in the region of the applicable value. That is the whole point of the design: the asset gets predictability without being taken out of the market.

Anyone who markets better than the average keeps the difference, because settlement is against the market value and not against the price actually achieved.

When it applies

Installations up to 100 kWp may elect the fixed feed-in tariff. Above 100 kWp the route runs through direct marketing with the sliding premium. For rooftop systems the fixed tariff sits between 5.44 and 12.22 ct/kWh in early August 2026 depending on size and on whether the system exports partially or fully, degressing 1% every six months on 1 February and 1 August. The rate in force at commissioning is then fixed for 20 years.

Negative prices

In hours with negative exchange prices the entitlement to the premium falls away. The installation may keep exporting but receives no compensation for those hours, which is why direct marketers curtail during them. The effect covers a limited number of hours a year, but across a 20-year yield model it stops being a rounding item.

For the economics of a commercial rooftop system the premium is rarely the main revenue line. The main line is avoided procurement: a kilowatt hour consumed on site displaces a retail purchase price and is therefore worth a multiple of what the same kilowatt hour earns when exported.

The tariff secures the residual volume. It decides how heavily the surplus the building cannot absorb weighs, and therefore drives sizing: a system dimensioned tightly to self-consumption gives up roof area in order to avoid a low-value revenue share. That is an arithmetic question per building, not a rule.

For a financing, the fixed tariff is the most reliable revenue line in the model because it is set for 20 years. The share of revenue that comes from market prices is discounted instead. The split between the two is part of what determines how large the senior piece can be.