diff --git a/src/libs/antares/study/parts/load/series.cpp b/src/libs/antares/study/parts/load/series.cpp
index 30fdbff736..283800eb94 100644
--- a/src/libs/antares/study/parts/load/series.cpp
+++ b/src/libs/antares/study/parts/load/series.cpp
@@ -91,6 +91,11 @@ double* DataSeriesLoad::getCoefficient(unsigned int year) const
     return timeSeries[getIndex(year)];
 }
 
+double DataSeriesLoad::getCoefficient(const unsigned int year, const unsigned int hour) const
+{
+    return timeSeries[getIndex(year)][hour];
+}
+
 unsigned int DataSeriesLoad::getIndex(unsigned int year) const
 {
     return (timeSeries.width != 1) ? timeseriesNumbers[0][year] : 0;
diff --git a/src/libs/antares/study/parts/load/series.h b/src/libs/antares/study/parts/load/series.h
index 76b90d5a85..86ec8f6a8c 100644
--- a/src/libs/antares/study/parts/load/series.h
+++ b/src/libs/antares/study/parts/load/series.h
@@ -50,6 +50,7 @@ class DataSeriesLoad
     void markAsModified() const;
 
     double* getCoefficient(unsigned int year) const;
+    double getCoefficient(const unsigned int year, const unsigned int hour) const;
     unsigned int getIndex(unsigned int year) const;
 
 public:
diff --git a/src/libs/antares/study/parts/solar/series.cpp b/src/libs/antares/study/parts/solar/series.cpp
index f47ad8d047..64a83cd2ab 100644
--- a/src/libs/antares/study/parts/solar/series.cpp
+++ b/src/libs/antares/study/parts/solar/series.cpp
@@ -91,6 +91,11 @@ double* DataSeriesSolar::getCoefficient(unsigned int year) const
     return timeSeries[getIndex(year)];
 }
 
+double DataSeriesSolar::getCoefficient(const unsigned int year, const unsigned int hour) const
+{
+    return timeSeries[getIndex(year)][hour];
+}
+
 unsigned int DataSeriesSolar::getIndex(unsigned int year) const
 {
     return (timeSeries.width != 1) ? timeseriesNumbers[0][year] : 0;
diff --git a/src/libs/antares/study/parts/solar/series.h b/src/libs/antares/study/parts/solar/series.h
index dd37fbc9dc..526eade30e 100644
--- a/src/libs/antares/study/parts/solar/series.h
+++ b/src/libs/antares/study/parts/solar/series.h
@@ -46,6 +46,7 @@ class DataSeriesSolar
     void markAsModified() const;
 
     double* getCoefficient(unsigned int year) const;
+    double getCoefficient(const unsigned int year, const unsigned int hour) const;
     unsigned int getIndex(unsigned int year) const;
 
 public:
diff --git a/src/solver/hydro/management/management.cpp b/src/solver/hydro/management/management.cpp
index f0963b52e9..365135b26c 100644
--- a/src/solver/hydro/management/management.cpp
+++ b/src/solver/hydro/management/management.cpp
@@ -394,9 +394,9 @@ void HydroManagement::prepareNetDemand(uint numSpace, uint year)
             // Aggregated renewable production: wind & solar
             if (parameters_.renewableGeneration.isAggregated())
             {
-                netdemand = +scratchpad.ts.load[area.load.series->getIndex(year)][hour]
+                netdemand = +area.load.series->getCoefficient(year, hour)
                             - area.wind.series->getCoefficient(year, hour) - scratchpad.miscGenSum[hour]
-                            - scratchpad.ts.solar[area.solar.series->getIndex(year)][hour] - ror[hour]
+                            - area.solar.series->getCoefficient(year, hour)
                             - ((ModeT != Data::stdmAdequacy) ? scratchpad.mustrunSum[hour]
                                                              : scratchpad.originalMustrunSum[hour]);
             }
@@ -404,7 +404,7 @@ void HydroManagement::prepareNetDemand(uint numSpace, uint year)
             // Renewable clusters, if enabled
             else if (parameters_.renewableGeneration.isClusters())
             {
-                netdemand = scratchpad.ts.load[area.load.series->getIndex(year)][hour]
+                netdemand = area.load.series->getCoefficient(year, hour)
                             - scratchpad.miscGenSum[hour] - ror[hour]
                             - ((ModeT != Data::stdmAdequacy) ? scratchpad.mustrunSum[hour]
                                                              : scratchpad.originalMustrunSum[hour]);
diff --git a/src/solver/simulation/sim_calcul_economique.cpp b/src/solver/simulation/sim_calcul_economique.cpp
index fa3e4dc14e..e752b065c5 100644
--- a/src/solver/simulation/sim_calcul_economique.cpp
+++ b/src/solver/simulation/sim_calcul_economique.cpp
@@ -569,9 +569,9 @@ void SIM_RenseignementProblemeHebdo(const Study& study,
             auto& area = *(study.areas.byIndex[k]);
             auto& scratchpad = area.scratchpad[numSpace];
             auto& ror = area.hydro.series->ror;
-            auto loadSeriesIndex = area.load.series->getIndex(problem.year);
+            auto loadSeries = area.load.series->getCoefficient(problem.year, hourInYear);
+            auto solarSeries = area.solar.series->getCoefficient(problem.year, hourInYear);
             auto hydroSeriesIndex = area.hydro.series->getIndex(problem.year);
-            auto solarSeriesIndex = area.solar.series->getIndex(problem.year);
 
             assert(&scratchpad);
 
@@ -580,7 +580,7 @@ void SIM_RenseignementProblemeHebdo(const Study& study,
             if (parameters.renewableGeneration.isAggregated())
             {
                 mustRunGen = area.wind.series->getCoefficient(problem.year, hourInYear)
-                             + scratchpad.ts.solar[solarSeriesIndex][hourInYear]
+                             + solarSeries
                              + scratchpad.miscGenSum[hourInYear] + ror[tsFatalIndex][hourInYear]
                              + scratchpad.mustrunSum[hourInYear];
             }
@@ -602,7 +602,7 @@ void SIM_RenseignementProblemeHebdo(const Study& study,
               && "NaN detected for 'AllMustRunGeneration', probably from miscGenSum/mustrunSum");
 
             problem.ConsommationsAbattues[hourInWeek].ConsommationAbattueDuPays[k]
-              = +scratchpad.ts.load[loadSeriesIndex][hourInYear]
+              = +loadSeries
                 - problem.AllMustRunGeneration[hourInWeek].AllMustRunGenerationOfArea[k];
 
             if (problem.CaracteristiquesHydrauliques[k].PresenceDHydrauliqueModulable > 0)