diff --git a/message_ix_models/data/costs/dac/cost_reduction.csv b/message_ix_models/data/costs/dac/cost_reduction.csv
new file mode 100755
index 0000000000..969b04eb25
--- /dev/null
+++ b/message_ix_models/data/costs/dac/cost_reduction.csv
@@ -0,0 +1,7 @@
+# Cost reduction in 2100,,,,,
+# ,,,,,
+# Units: %  ,,,,,
+message_technology,very_low,low,medium,high,very_high
+dac_lt,0.1,0.3,0.5,0.7,0.9
+dac_hte,0.1,0.3,0.5,0.7,0.9
+dac_htg,0.1,0.3,0.5,0.7,0.9
\ No newline at end of file
diff --git a/message_ix_models/data/costs/dac/scenarios_reduction.csv b/message_ix_models/data/costs/dac/scenarios_reduction.csv
new file mode 100755
index 0000000000..045b2a133c
--- /dev/null
+++ b/message_ix_models/data/costs/dac/scenarios_reduction.csv
@@ -0,0 +1,4 @@
+message_technology,SSP1,SSP2,SSP3,SSP4,SSP5,LED
+dac_lt,low,medium,medium,high,high,low
+dac_hte,low,medium,medium,high,high,low
+dac_htg,low,medium,medium,high,high,low
\ No newline at end of file
diff --git a/message_ix_models/data/costs/energy/cost_reduction.csv b/message_ix_models/data/costs/energy/cost_reduction.csv
index 2ed01b6b7e..25387b11ec 100755
--- a/message_ix_models/data/costs/energy/cost_reduction.csv
+++ b/message_ix_models/data/costs/energy/cost_reduction.csv
@@ -96,7 +96,4 @@ wind_res_hist_2020,0.15,0.3,0.53,0.53,0.65,0.75
 wind_res1,0.15,0.3,0.53,0.53,0.65,0.75
 wind_res2,0.15,0.3,0.53,0.53,0.65,0.75
 wind_res3,0.15,0.3,0.53,0.53,0.65,0.75
-wind_res4,0.15,0.3,0.53,0.53,0.65,0.75
-dac_lt,0.1,0.3,0.5,0.7,0.9
-dac_hte,0.1,0.3,0.5,0.7,0.9
-dac_htg,0.1,0.3,0.5,0.7,0.9
+wind_res4,0.15,0.3,0.53,0.53,0.65,0.75
\ No newline at end of file
diff --git a/message_ix_models/data/costs/energy/scenarios_reduction.csv b/message_ix_models/data/costs/energy/scenarios_reduction.csv
index dcacdeeff7..d9a964f839 100755
--- a/message_ix_models/data/costs/energy/scenarios_reduction.csv
+++ b/message_ix_models/data/costs/energy/scenarios_reduction.csv
@@ -89,6 +89,3 @@ wind_res1,high,medium,low,high,medium,very_high
 wind_res2,high,medium,low,high,medium,very_high
 wind_res3,high,medium,low,high,medium,very_high
 wind_res4,high,medium,low,high,medium,very_high
-dac_lt,low,medium,medium,high,high,low
-dac_hte,low,medium,medium,high,high,low
-dac_htg,low,medium,medium,high,high,low
diff --git a/message_ix_models/tools/costs/decay.py b/message_ix_models/tools/costs/decay.py
index a28fcb0341..8917b6434e 100644
--- a/message_ix_models/tools/costs/decay.py
+++ b/message_ix_models/tools/costs/decay.py
@@ -11,7 +11,7 @@
 
 
 def _get_module_scenarios_reduction(
-    module: Literal["energy", "materials", "cooling"],
+    module: Literal["energy", "materials", "cooling", "dac"],
     energy_map_df: pd.DataFrame,
     tech_map_df: pd.DataFrame,
 ) -> pd.DataFrame:
@@ -160,7 +160,7 @@ def _get_module_scenarios_reduction(
 
 
 def _get_module_cost_reduction(
-    module: Literal["energy", "materials", "cooling"],
+    module: Literal["energy", "materials", "cooling", "dac"],
     energy_map_df: pd.DataFrame,
     tech_map_df: pd.DataFrame,
 ) -> pd.DataFrame:
@@ -294,7 +294,7 @@ def _get_module_cost_reduction(
 
 # create function to get technology reduction scenarios data
 def get_technology_reduction_scenarios_data(
-    first_year: int, module: Literal["energy", "materials", "cooling"]
+    first_year: int, module: Literal["energy", "materials", "cooling", "dac"]
 ) -> pd.DataFrame:
     # Get full list of technologies from mapping
     tech_map = energy_map = get_raw_technology_mapping("energy")
diff --git a/message_ix_models/tools/costs/regional_differentiation.py b/message_ix_models/tools/costs/regional_differentiation.py
index 8957475d96..aec47d0e4d 100644
--- a/message_ix_models/tools/costs/regional_differentiation.py
+++ b/message_ix_models/tools/costs/regional_differentiation.py
@@ -172,7 +172,7 @@ def get_intratec_data() -> pd.DataFrame:
 
 
 def get_raw_technology_mapping(
-    module: Literal["energy", "materials", "cooling"],
+    module: Literal["energy", "materials", "cooling", "dac"],
 ) -> pd.DataFrame:
     """Retrieve a technology mapping for `module`.
 
@@ -235,7 +235,7 @@ def subset_module_map(raw_map):
 
 
 def adjust_technology_mapping(
-    module: Literal["energy", "materials", "cooling"],
+    module: Literal["energy", "materials", "cooling", "dac"],
 ) -> pd.DataFrame:
     """Adjust technology mapping based on sources and assumptions.