diff --git a/pollination/three_phase/entry.py b/pollination/three_phase/entry.py
index 5664f4f..b16add1 100644
--- a/pollination/three_phase/entry.py
+++ b/pollination/three_phase/entry.py
@@ -286,7 +286,8 @@ def prepare_three_phase(
     ):
         return [
             {
-                'from': ThreePhaseInputsPreparation()._outputs.multiplication_info
+                'from': ThreePhaseInputsPreparation()._outputs.multiplication_info,
+                'to': '../../calcs/3_phase/info/multiplication_info.json'
             },
             {
                 'from': ThreePhaseInputsPreparation()._outputs.grouped_apertures_info,
@@ -298,12 +299,18 @@ def prepare_three_phase(
             }
         ]
 
+    @task(template=ReadJSONList, needs=[prepare_three_phase])
+    def multiplication_info_to_json(
+            self, src=prepare_three_phase._outputs.multiplication_info
+            ):
+        return [{'from': ReadJSONList()._outputs.data}]
+
     @task(
         template=ThreePhaseMatrixCalculation,
         needs=[
             create_rad_folder, prepare_multiphase,
             create_total_sky, create_sky_dome,
-            prepare_three_phase
+            prepare_three_phase, multiplication_info_to_json
         ],
         sub_folder='calcs/3_phase',
         sub_paths={
@@ -314,7 +321,7 @@ def calculate_three_phase_matrix_total(
         self,
         model_folder=create_rad_folder._outputs.model_folder,
         grouped_apertures_folder=prepare_three_phase._outputs.grouped_apertures_folder,
-        multiplication_info=prepare_three_phase._outputs.multiplication_info,
+        multiplication_info=multiplication_info_to_json._outputs.data,
         receivers=create_rad_folder._outputs.receivers,
         view_mtx_rad_params=view_mtx_rad_params,
         daylight_mtx_rad_params=daylight_mtx_rad_params,
diff --git a/pollination/three_phase/three_phase/preparation.py b/pollination/three_phase/three_phase/preparation.py
index 7fae97a..01357c7 100644
--- a/pollination/three_phase/three_phase/preparation.py
+++ b/pollination/three_phase/three_phase/preparation.py
@@ -93,7 +93,7 @@ def get_three_phase_combinations(
         'calculation.', source='model/sender/_info.json'
     )
 
-    multiplication_info = Outputs.list(
+    multiplication_info = Outputs.file(
         description='A JSON file with matrix multiplication information.',
         source='multiplication_info.json'
     )