diff --git a/src/devices_models/devices/common/objective_function/piecewise_linear.jl b/src/devices_models/devices/common/objective_function/piecewise_linear.jl
index f39378f2c..ce3928201 100644
--- a/src/devices_models/devices/common/objective_function/piecewise_linear.jl
+++ b/src/devices_models/devices/common/objective_function/piecewise_linear.jl
@@ -537,7 +537,8 @@ function _add_variable_cost_to_objective!(
     end
     pwl_fuel_consumption_expressions =
         _add_pwl_term!(container, component, cost_function, T(), U())
-    is_time_variant = PSY.has_time_series(component)
+
+    is_time_variant = is_time_variant(cost_function)
     for t in get_time_steps(container)
         fuel_cost_value = _get_fuel_cost_value(
             container,
diff --git a/src/utils/powersystems_utils.jl b/src/utils/powersystems_utils.jl
index 5d7fedf43..b7fd19292 100644
--- a/src/utils/powersystems_utils.jl
+++ b/src/utils/powersystems_utils.jl
@@ -338,6 +338,10 @@ function _get_piecewise_incrementalcurve_per_system_unit(
     return PSY.PiecewiseStepData(x_coords_normalized, y_coords_normalized)
 end
 
+function is_time_variant(cost_function::PSY.FuelCurve{PSY.PiecewisePointCurve})
+    return isa(PSY.get_fuel_cost(cost_function), IS.TimeSeriesKey)
+end
+
 function get_deterministic_time_series_type(sys::PSY.System)
     time_series_types = IS.get_time_series_counts_by_type(sys.data)
     @show existing_types = Set(d["type"] for d in time_series_types)