diff --git a/src/lib/watt-time/index.ts b/src/lib/watt-time/index.ts
index 22b5a7f1d..fa55eb32b 100644
--- a/src/lib/watt-time/index.ts
+++ b/src/lib/watt-time/index.ts
@@ -158,7 +158,7 @@ export class WattTimeGridEmissions implements IImpactModelInterface {
       observation['grid-ci'] = emissionSum / datapoints;
     });
 
-    return Promise.resolve(observations as any[]);
+    return observations;
   }
 
   async fetchData(observation: KeyValuePair): Promise<KeyValuePair[]> {