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Tariffs: add example for feed in for only non-negative spot market prices #923

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Tariffs: add example for feed in for only non-negative spot market prices #923

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17 changes: 17 additions & 0 deletions docs/tariffs.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -225,6 +225,23 @@ Der Netzgebührenanteil (`gridfee`) unterscheidet sich im Winter (Oktober - Mär
Zudem gibt es Normal- (6-17 Uhr, 21-24 Uhr), Niedrig- (0-6 Uhr) und Hochlastzonen (17-21 Uhr).
In diesem Beispiel betragen die Gebühren im Juni um 4 Uhr 0,1467 DKK/kWh.

#### Beispiel: Keine Einspeisevergütung bei negativen Strompreisen

Für deutsche PV-Anlagen, die [seit dem 25. Februar 2025 in Betrieb genommen wurde](https://www.clearingstelle-eeg-kwkg.de/haeufige-rechtsfrage/264),
wird die Einspeisevergütung nicht gezahlt, falls der Börsenstrompreis negativ ist.
Mit der folgenden Formel wird dies in der Berechnung des Preises berücksichtigt.

```yaml
tariffs:
feedin:
type: template
template: energy-charts-api
bzn: DE-LU
formula: factor := 1.0; if price < 0 { factor = 0.0 }; factor * 0.07
```

In diesem Beispiel gibt es eine fixe Einspeisevergütung von 7 ct/kWh, außer bei negativen Börsenpreisen.

<!-- AUTO-GENERATED CONTENT BELOW THIS LINE -->

<!-- AUTO-GENERATED FROM TEMPLATE - PLEASE EDIT HERE https://github.com/evcc-io/evcc/tree/master/templates/definition/tariff -->
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17 changes: 17 additions & 0 deletions i18n/en/docusaurus-plugin-content-docs/current/tariffs.mdx
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Expand Up @@ -226,6 +226,23 @@ The grid fee (`gridfee`) differs in winter (October - March) and summer (April -
Additionally there is a high- (6am-5pm, 9-12pm), low- (0-6am) and peak-load (5pm-9pm) zone.
In this example the grid fee is 0.1467 DKK/kWh at 4am in June.

#### Example: No feed-in tariff in case of negative day-ahead market prices

For German PV systems [commissioned since February 25, 2025](https://www.clearingstelle-eeg-kwkg.de/haeufige-rechtsfrage/264),
the feed-in tariff is not paid if the day-ahead market price is negative.
This is taken into account in the price calculation using the following formula.

```yaml
tariffs:
feedin:
type: template
template: energy-charts-api
bzn: DE-LU
formula: factor := 1.0; if price < 0 { factor = 0.0 }; factor * 0.07
```

In this example, there is a fixed feed-in tariff of 7 ct/kWh, except in the case of negative day-ahead market prices.

<!-- AUTO-GENERATED CONTENT BELOW THIS LINE -->

<!-- AUTO-GENERATED FROM TEMPLATE - PLEASE EDIT HERE https://github.com/evcc-io/evcc/tree/master/templates/definition/tariff -->
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