From f0b6bc934e7650b02f19a706b8bdb6dbcb212964 Mon Sep 17 00:00:00 2001
From: fanatix <43752712+djfanatix@users.noreply.github.com>
Date: Sat, 18 Oct 2025 10:29:54 +0200
Subject: [PATCH] Stekker: use 15min resolution for BE/NL (#24028)

---
 tariff/stekker.go                        | 16 ++++++++++++----
 templates/definition/tariff/stekker.yaml |  3 +++
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/tariff/stekker.go b/tariff/stekker.go
index 654edbc7d..0159ca065 100644
--- a/tariff/stekker.go
+++ b/tariff/stekker.go
@@ -59,6 +59,13 @@ func NewStekkerFromConfig(other map[string]interface{}) (api.Tariff, error) {
 		return nil, err
 	}
 
+	switch cc.Region {
+	case "BE":
+		cc.Region = "BE-900"
+	case "NL":
+		cc.Region = "NL-900"
+	}
+
 	t := &Stekker{
 		embed:  &cc.embed,
 		region: cc.Region,
@@ -75,7 +82,6 @@ func (t *Stekker) run(done chan error) {
 
 	for tick := time.Tick(time.Hour); ; <-tick {
 		url := fmt.Sprintf("%s?advanced_view=&region=%s&unit=MWh", stekkerURI, t.region)
-
 		resp, err := client.Get(url)
 		if err != nil {
 			once.Do(func() { done <- err })
@@ -137,12 +143,14 @@ func (t *Stekker) run(done chan error) {
 					continue
 				}
 
-				start = start.UTC()
-				end := start.Add(time.Hour)
+				duration := time.Hour
+				if t.region == "BE" || t.region == "NL" {
+					duration = SlotDuration
+				}
 
 				res = append(res, api.Rate{
 					Start: start,
-					End:   end,
+					End:   start.Add(duration),
 					Value: t.totalPrice(yt/1000.0, start), // €/MWh → €/kWh
 				})
 			}
diff --git a/templates/definition/tariff/stekker.yaml b/templates/definition/tariff/stekker.yaml
index a86288404..218c8d8c8 100644
--- a/templates/definition/tariff/stekker.yaml
+++ b/templates/definition/tariff/stekker.yaml
@@ -11,6 +11,9 @@ params:
   - name: region
     example: BE
     type: choice
+    required: true
+    description:
+      generic: Market region code
     choice:
       [
         "DE-LU",