diff --git a/scripts/add_electricity.py b/scripts/add_electricity.py
index c12d2b33..a4921ac4 100755
--- a/scripts/add_electricity.py
+++ b/scripts/add_electricity.py
@@ -370,8 +370,8 @@ def attach_conventional_generators(
     ppl["efficiency"] = ppl.efficiency.fillna(ppl.efficiency_r)
     
 
-    fuel_price = (fuel_price.assign(OCGT=m_fuel_price['gas'],
-                                    CCGT=m_fuel_price['gas'])
+    fuel_price = (fuel_price.assign(OCGT=fuel_price['gas'],
+                                    CCGT=fuel_price['gas'])
                     .drop("gas", axis=1))
     fuel_price = fuel_price.reindex(ppl.carrier, axis=1)
     fuel_price.fillna(costs.fuel, inplace=True)