diff --git a/CHANGELOG.md b/CHANGELOG.md
index e70d92361a..909f8a14cd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -33,6 +33,8 @@ the charging capacity of the storage component in VRE_STOR (#770).
 with Julia v1.11 (#785).
 - Fixed cost calculation in `write_costs.jl` when no resources are present in 
 a zone. (#796)
+- Added `eTotalCMaxCapSlack` to calculation of `cUnmetPolicyPenalty` in 
+`write_costs.jl` (#806).
 
 ## [0.4.1] - 2024-08-20
 
diff --git a/src/write_outputs/write_costs.jl b/src/write_outputs/write_costs.jl
index 70bda8516e..9193865911 100644
--- a/src/write_outputs/write_costs.jl
+++ b/src/write_outputs/write_costs.jl
@@ -127,6 +127,10 @@ function write_costs(path::AbstractString, inputs::Dict, setup::Dict, EP::Model)
         dfCost[9, 2] += value(EP[:eTotalCMinCapSlack])
     end
 
+    if haskey(inputs, "MaxCapPriceCap")
+        dfCost[9, 2] += value(EP[:eTotalCMaxCapSlack])
+    end
+
     if haskey(inputs, "H2DemandPriceCap")
         dfCost[9, 2] += value(EP[:eTotalCH2DemandSlack])
     end