diff --git a/app/models/entsoe.rb b/app/models/entsoe.rb
index 7d9f3b5..fc681a8 100644
--- a/app/models/entsoe.rb
+++ b/app/models/entsoe.rb
@@ -42,10 +42,10 @@ class Entsoe
     sorted_prices = prices_at(date).to_a.sort_by(&:last) # sort according to price 
     highest_hour = sorted_prices.last[0] 
     
-    # From Apr-Oct: do not charge; every hour that has cost > charge_rate is a high_hour
+    # From Apr-Oct: do not charge; every hour that has cost > 0 is a high_hour
     if [4,5,6,7,8,9,10].include?(date.month)
       lowest_hour = "" # effectively no charging from grid
-      high_hours = sorted_prices.select{|p| p[1] > storage_cost}
+      high_hours = sorted_prices.select{|p| p[1] > 0}
     else      
       lowest_hour = sorted_prices.first[0]