diff --git a/tests/integration_tests/fixtures/energy_dashboard.py b/tests/integration_tests/fixtures/energy_dashboard.py
index 1ca9185468af2..f4362ea7463af 100644
--- a/tests/integration_tests/fixtures/energy_dashboard.py
+++ b/tests/integration_tests/fixtures/energy_dashboard.py
@@ -45,6 +45,7 @@ def load_energy_table_data():
             if_exists="replace",
             chunksize=500,
             index=False,
+            dtype={"source": String(255), "target": String(255), "value": Float()},
             method="multi",
             schema=get_example_default_schema(),
         )