Energy Price Forecast: add api key (#33081)

templates/definition/tariff/energypriceforecast.yaml

@@ -6,7 +6,7 @@ products:
 requirements:
   description:
     de: "Day-Ahead-Strompreise plus 4 Tage Prognose [energypriceforecast.eu](https://energypriceforecast.eu/de/evcc-strompreis-co2-prognose/)"
-    en: "Spot prices in day-ahead market plus 4 days prognosis [energypriceforecast.eu](https://energypriceforecast.eu)"
+    en: "Day-ahead spot prices plus a 4-day forecast [energypriceforecast.eu](https://energypriceforecast.eu/en/evcc-electricity-price-co2-forecast/)"
   evcc: ["skiptest"]
 group: price
 countries: ["DE", "NL", "BE", "DK", "FR", "AT", "CZ", "PL", "FI", "SE", "NO"]
@@ -39,6 +39,10 @@ params:
     required: true
   - name: currency
     choice: ["EUR", "DKK", "CZK", "PLN", "SEK", "NOK"]
+  - name: apikey
+    help:
+      en: "Optional for forecasts up to 120 hours. [Get an API key](https://energypriceforecast.eu/en/api-early-access/)."
+      de: "Optional für Prognosen bis zu 120 Stunden. [API-Key erhalten](https://energypriceforecast.eu/de/api-early-access/)."
   - name: horizon
     default: 120
     type: int
@@ -46,6 +50,9 @@ params:
     description:
       en: Forecast horizon
       de: Prognosehorizont
+    help:
+      en: Anonymous access is limited to 48 hours from October 1, 2026. An API key allows up to 120 hours.
+      de: Anonymer Zugriff ist ab 1. Oktober 2026 auf 48 Stunden begrenzt. Mit API-Key sind bis zu 120 Stunden möglich.
     required: true
   - preset: tariff-base
   - preset: tariff-features
@@ -56,3 +63,8 @@ render: |
   forecast:
     source: http
     uri: https://api.energypriceforecast.eu/api/v1/evcc/tariff?country={{.region}}&type=grid&currency={{.currency}}&hours={{.horizon}}
+    {{ if .apikey }}
+    auth:
+      type: bearer
+      token: {{ .apikey }}
+    {{- end }}