take yearshift into account

app/models/cost.rb

@@ -177,11 +177,10 @@ class Cost
     hour_start = date.in_time_zone("Amsterdam").beginning_of_day
     day_end = hour_start.advance(days: 1)
     result = []
-    lowest_hour, highest_hour,high_hours = entsoe.high_low_hours(date)
+    lowest_hour, highest_hour,high_hours = entsoe.high_low_hours(date.advance(years: year_shift))
     
     while(hour_start < day_end) do
       hour_end = hour_start.end_of_hour
-      formatted_hour = hour_start.strftime("%F %H")
       
       #p "Fetching meter readings between %s and %s" % [hour_start,hour_end]
       hour_readings = Reading.where("created_at > :begin AND created_at < :end", {:begin => hour_start, :end => hour_end})
@@ -189,6 +188,8 @@ class Cost
       # calculate cost of this hour
       usage_kwh = hour_diff[:total_kwh_consumed_high] + hour_diff[:total_kwh_consumed_low] rescue nil
       return_kwh = hour_diff[:total_kwh_produced_high] + hour_diff[:total_kwh_produced_low] rescue nil
+
+      formatted_hour = hour_start.advance(years: year_shift).strftime("%F %H")
       entsoe_cost = entsoe_energy_cost(formatted_hour, usage_kwh, return_kwh) # without battery use
 
       #

app/models/entsoe.rb

@@ -114,6 +114,7 @@ class Entsoe
         prices.map{|p| [start_time.advance(hours: (p[0]-1)), p[1]]}.to_h
       rescue Date::Error => e
         p e.message
+        {}
       end    
     end
 end