diff --git a/code/modules/power/generator.dm b/code/modules/power/generator.dm
index f3f960c0ee..8e121dc809 100644
--- a/code/modules/power/generator.dm
+++ b/code/modules/power/generator.dm
@@ -65,7 +65,7 @@
 
 
 			if(delta_temperature > 0 && cold_air_heat_capacity > 0 && hot_air_heat_capacity > 0)
-				var/efficiency = 0.65
+				var/efficiency = 0.45
 
 				var/energy_transfer = delta_temperature*hot_air_heat_capacity*cold_air_heat_capacity/(hot_air_heat_capacity+cold_air_heat_capacity)