diff --git a/src/libecalc/application/energy_calculator.py b/src/libecalc/application/energy_calculator.py
index 75c34f27bf..bb8f59ae90 100644
--- a/src/libecalc/application/energy_calculator.py
+++ b/src/libecalc/application/energy_calculator.py
@@ -1,5 +1,4 @@
 from collections import defaultdict
-from functools import reduce
 from typing import Dict
 
 import numpy as np
@@ -43,10 +42,6 @@
 )
 
 
-def merge_results(results_per_period: Dict[Period, EcalcModelResult]) -> EcalcModelResult:
-    return reduce(lambda acc, x: acc.merge(x), results_per_period.values())
-
-
 class EnergyCalculator:
     def __init__(
         self,
diff --git a/src/libecalc/common/utils/rates.py b/src/libecalc/common/utils/rates.py
index bdbbf82ae1..0288703d6c 100644
--- a/src/libecalc/common/utils/rates.py
+++ b/src/libecalc/common/utils/rates.py
@@ -387,10 +387,6 @@ def __eq__(self, other: object) -> bool:
             and self.unit == other.unit
         )
 
-    def append(self, period: Period, value: TimeSeriesValue):
-        self.periods.append(period)
-        self.values.append(value)
-
 
 class TimeSeriesString(TimeSeries[str]):
     def resample(self, freq: Frequency, include_start_date: bool, include_end_date: bool) -> Self: