diff --git a/Gemfile b/Gemfile
index a847c88..0ba5c40 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,3 +12,4 @@ gem 'ruby-gr'
 gem 'gr-plot'
 gem 'histogram'
 gem 'numo-narray'
+gem 'gruff'
diff --git a/Gemfile.lock b/Gemfile.lock
index b9cfff9..0232c94 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -21,6 +21,9 @@ GEM
       raabro (~> 1.4)
     gr-plot (0.0.1)
       ruby-gr
+    gruff (0.19.0)
+      histogram
+      rmagick (>= 4.2)
     histogram (0.2.4.1)
     i18n (1.8.11)
       concurrent-ruby (~> 1.0)
@@ -37,6 +40,7 @@ GEM
     pkg-config (1.4.9)
     raabro (1.4.0)
     racc (1.6.0)
+    rmagick (5.0.0)
     ruby-gr (0.66.0.0)
       fiddle
       numo-narray
@@ -55,6 +59,7 @@ DEPENDENCIES
   activerecord
   daemons
   gr-plot
+  gruff
   histogram
   mail
   mysql2
diff --git a/app/models/cost.rb b/app/models/cost.rb
index c928344..42b47ff 100644
--- a/app/models/cost.rb
+++ b/app/models/cost.rb
@@ -4,8 +4,8 @@ EASY_ENERGY_TARIFFS = {}
 
 # See https://www.belastingdienst.nl/wps/wcm/connect/bldcontentnl/belastingdienst/zakelijk/overige_belastingen/belastingen_op_milieugrondslag/tarieven_milieubelastingen/tabellen_tarieven_milieubelastingen
 # Without VAT
-ENERGY_TAX_KWH = { 2020 => 0.09770, 2021 => 0.09428, 2022 => 0.03679}
-ODE_KWH = { 2020 => 0.0273, 2021 => 0.0300, 2022 => 0.0305}
+ENERGY_TAX_KWH = { 2020 => 0.09770, 2021 => 0.09428, 2022 => 0.03679, 2023 => 0.12599 }
+ODE_KWH = { 2020 => 0.0273, 2021 => 0.0300, 2022 => 0.0305, 2023 => 0.0}
 # merge by adding values
 TAX_KWH = ENERGY_TAX_KWH.merge(ODE_KWH){|key, energy_tax, ode| energy_tax + ode}
 
@@ -151,6 +151,9 @@ class Cost
         high_tariff ? 0.06782 : 0.05259
       when 2022
         high_tariff ? 0.23665 : 0.19408
+      when 2023
+        # rate excl. VAT
+        high_tariff ? 0.47758 : 0.34165  
     end
   end
     
@@ -175,10 +178,15 @@ class Cost
         # normaal_kwh * (0.23665 + 0.04452 + 0.03691) + dal_kwh * (0.19408 + 0.04452 + 0.03691) 
         normaal_kwh_cost = 0.23665
         dal_kwh_cost = 0.19408
-      # From 8 Sept 2022 until 31 December 2025 (may need to extend this)
-      when 1662595200..1767139200
+      # From 8 Sept 2022 until 31 December 2022 
+      when 1662595200..1672527599
         normaal_kwh_cost = 0.60824
         dal_kwh_cost = 0.43701
+      # From 1 Jan 2023 until 31 December 2023
+      when 1672527600..1704063599
+        vat = 1 + vat_at(Date.parse(formatted_hour))
+        normaal_kwh_cost = 0.47758*vat
+        dal_kwh_cost = 0.34165*vat   
       else
         # catch-all, incase 'formated_hour' is outside any of the cases
         normaal_kwh_cost = 0.0
diff --git a/frankenergy.py b/frankenergy.py
new file mode 100644
index 0000000..ade0eef
--- /dev/null
+++ b/frankenergy.py
@@ -0,0 +1,46 @@
+import requests
+from datetime import datetime, timedelta
+import csv
+
+def FrankEnergy():
+    now = datetime.now()
+
+    yesterday = datetime.now() + timedelta(days=-1)
+    startdate = yesterday.strftime("%Y-%m-%d")
+    enddate = now.strftime("%Y-%m-%d")
+
+    if int(now.strftime("%H")) > 15:
+        tomorrow = datetime.now() + timedelta(days=2)
+        startdate = now.strftime("%Y-%m-%d")
+        enddate = tomorrow.strftime("%Y-%m-%d")
+
+    headers = { "content-type":"application/json" }
+
+    query = f"""query MarketPrices {{
+        marketPricesGas(startDate: "{startdate}", endDate: "{enddate}") {{
+        from
+        till
+        marketPrice
+        priceIncludingMarkup
+    }}
+    }}"""
+
+    response = requests.post('https://graphcdn.frankenergie.nl', json={'query': query}, headers=headers)
+    data = response.json()
+
+    frank_gas_file = "frank_gas.csv"
+
+    frank_headers = ['till', 'from', 'marketPrice', 'priceIncludingMarkup']
+
+    with open(frank_gas_file, 'w') as csvfile:
+        writer = csv.DictWriter(csvfile, fieldnames = frank_headers)
+        writer.writeheader()
+        writer.writerows(data['data']['marketPricesGas'])
+
+    for gas in data['data']['marketPricesGas']:
+        print(gas['till'], gas['from'],gas['marketPrice'], gas['priceIncludingMarkup'])
+
+
+if __name__ == "__main__":
+    FrankEnergy()
+
diff --git a/stacked_bar.png b/stacked_bar.png
new file mode 100644
index 0000000..99dbbde
Binary files /dev/null and b/stacked_bar.png differ