diff --git a/ApplicationLibCode/Application/Tools/RiaColorTools.cpp b/ApplicationLibCode/Application/Tools/RiaColorTools.cpp
index 04bdce0935..0a0e175524 100644
--- a/ApplicationLibCode/Application/Tools/RiaColorTools.cpp
+++ b/ApplicationLibCode/Application/Tools/RiaColorTools.cpp
@@ -196,8 +196,10 @@ cvf::Color3f RiaColorTools::makeLighter( const cvf::Color3f& color, float normal
     double l = 0.0;
     qColor.getHslF( &h, &s, &l );
 
+    // A negative value will make the color darker
     l = l + ( 1.0 - l ) * normalizedScalingFactor;
-    l = std::min( 1.0, l );
+
+    l = std::clamp( l, 0.0, 1.0 );
 
     qColor.setHslF( h, s, l );
 
diff --git a/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryCurvesForSummaryCasesFeature.cpp b/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryCurvesForSummaryCasesFeature.cpp
index a40c7045a4..abbe5f2da0 100644
--- a/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryCurvesForSummaryCasesFeature.cpp
+++ b/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryCurvesForSummaryCasesFeature.cpp
@@ -24,6 +24,7 @@
 
 #include "RimSummaryAddressCollection.h"
 #include "RimSummaryCase.h"
+#include "RimSummaryCaseCollection.h"
 #include "RimSummaryMultiPlot.h"
 #include "RimSummaryPlot.h"
 
@@ -77,12 +78,21 @@ void RicAppendSummaryCurvesForSummaryCasesFeature::setupActionLook( QAction* act
 //--------------------------------------------------------------------------------------------------
 std::vector<caf::PdmObjectHandle*> RicAppendSummaryCurvesForSummaryCasesFeature::selectedCases()
 {
-    std::vector<RimSummaryCase*> objects;
-    caf::SelectionManager::instance()->objectsByType( &objects );
-
     // Make the object type general to match the expected type for handleDroppedObjects();
     std::vector<caf::PdmObjectHandle*> generalObjects;
-    generalObjects.insert( generalObjects.begin(), objects.begin(), objects.end() );
+
+    {
+        std::vector<RimSummaryCase*> objects;
+        caf::SelectionManager::instance()->objectsByType( &objects );
+
+        generalObjects.insert( generalObjects.begin(), objects.begin(), objects.end() );
+    }
+    {
+        std::vector<RimSummaryCaseCollection*> objects;
+        caf::SelectionManager::instance()->objectsByType( &objects );
+
+        generalObjects.insert( generalObjects.begin(), objects.begin(), objects.end() );
+    }
 
     return generalObjects;
 }
diff --git a/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForObjectsFeature.cpp b/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForObjectsFeature.cpp
index 0793ec30a5..1c38f6486f 100644
--- a/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForObjectsFeature.cpp
+++ b/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForObjectsFeature.cpp
@@ -77,9 +77,21 @@ void RicAppendSummaryPlotsForObjectsFeature::appendPlots( RimSummaryMultiPlot* s
                 summaryMultiPlot->addPlot( duplicatedPlot );
 
                 auto summaryCase = RiaSummaryTools::summaryCaseById( summaryAdrCollection->caseId() );
-                for ( auto c : duplicatedPlot->summaryCurves() )
+                if ( summaryCase )
                 {
-                    c->setSummaryCaseY( summaryCase );
+                    for ( auto c : duplicatedPlot->summaryCurves() )
+                    {
+                        c->setSummaryCaseY( summaryCase );
+                    }
+                }
+
+                auto ensemble = RiaSummaryTools::ensembleById( summaryAdrCollection->ensembleId() );
+                if ( ensemble )
+                {
+                    for ( auto c : duplicatedPlot->curveSets() )
+                    {
+                        c->setSummaryCaseCollection( ensemble );
+                    }
                 }
             }
             else
@@ -102,6 +114,51 @@ void RicAppendSummaryPlotsForObjectsFeature::appendPlots( RimSummaryMultiPlot* s
     }
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RicAppendSummaryPlotsForObjectsFeature::appendPlots( RimSummaryMultiPlot*                summaryMultiPlot,
+                                                          const std::vector<RimSummaryCase*>& cases,
+                                                          const std::vector<RimSummaryCaseCollection*>& ensembles )
+{
+    auto addressCollectionsToBeDeleted =
+        RicAppendSummaryPlotsForObjectsFeature::createAddressCollections( cases, ensembles );
+    RicAppendSummaryPlotsForObjectsFeature::appendPlots( summaryMultiPlot, addressCollectionsToBeDeleted );
+
+    for ( auto obj : addressCollectionsToBeDeleted )
+    {
+        delete obj;
+    }
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+std::vector<RimSummaryAddressCollection*>
+    RicAppendSummaryPlotsForObjectsFeature::createAddressCollections( const std::vector<RimSummaryCase*>& cases,
+                                                                      const std::vector<RimSummaryCaseCollection*>& ensembles )
+{
+    std::vector<RimSummaryAddressCollection*> addresses;
+
+    for ( auto c : cases )
+    {
+        auto myColl = new RimSummaryAddressCollection;
+        myColl->setContentType( RimSummaryAddressCollection::CollectionContentType::SUMMARY_CASE );
+        myColl->setCaseId( c->caseId() );
+        addresses.push_back( myColl );
+    }
+
+    for ( auto c : ensembles )
+    {
+        auto myColl = new RimSummaryAddressCollection;
+        myColl->setContentType( RimSummaryAddressCollection::CollectionContentType::SUMMARY_CASE );
+        myColl->setEnsembleId( c->ensembleId() );
+        addresses.push_back( myColl );
+    }
+
+    return addresses;
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
@@ -276,8 +333,9 @@ std::vector<RimSummaryPlot*> RicAppendSummaryPlotsForObjectsFeature::plotsForOne
 
     std::string wellNameToMatch;
     std::string groupNameToMatch;
-    int         regionToMatch = -1;
-    int         caseIdToMatch = -1;
+    int         regionToMatch     = -1;
+    int         caseIdToMatch     = -1;
+    int         ensembleIdToMatch = -1;
 
     RiaSummaryAddressAnalyzer myAnalyser;
     for ( auto sourcePlot : sourcePlots )
@@ -307,6 +365,11 @@ std::vector<RimSummaryPlot*> RicAppendSummaryPlotsForObjectsFeature::plotsForOne
             {
                 caseIdToMatch = curves.front()->summaryCaseY()->caseId();
             }
+            auto curveSets = sourcePlots.back()->curveSets();
+            if ( !curveSets.empty() )
+            {
+                ensembleIdToMatch = curveSets.front()->ensembleId();
+            }
         }
     }
 
@@ -322,6 +385,14 @@ std::vector<RimSummaryPlot*> RicAppendSummaryPlotsForObjectsFeature::plotsForOne
                 if ( c->summaryCaseY()->caseId() == caseIdToMatch ) isMatching = true;
             }
         }
+        else if ( ensembleIdToMatch != -1 )
+        {
+            auto curveSets = sourcePlot->curveSets();
+            for ( auto c : curveSets )
+            {
+                if ( c->summaryCaseCollection()->ensembleId() == ensembleIdToMatch ) isMatching = true;
+            }
+        }
         else
         {
             auto addresses = RimSummaryAddressModifier::createEclipseSummaryAddress( sourcePlot );
diff --git a/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForObjectsFeature.h b/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForObjectsFeature.h
index 6723f922ed..ae3b88c8ee 100644
--- a/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForObjectsFeature.h
+++ b/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForObjectsFeature.h
@@ -29,6 +29,8 @@ class RimSummaryAddressCollection;
 class RimSummaryMultiPlot;
 class RifEclipseSummaryAddress;
 class RimSummaryPlot;
+class RimSummaryCase;
+class RimSummaryCaseCollection;
 
 //==================================================================================================
 ///
@@ -39,21 +41,31 @@ class RicAppendSummaryPlotsForObjectsFeature : public caf::CmdFeature
 
 public:
     static std::vector<RimSummaryAddressCollection*> selectedCollections();
+
     static std::vector<RimSummaryPlot*>
-                plotsForOneInstanceOfObjectType( const std::vector<RimSummaryPlot*>&                sourcePlots,
-                                                 RimSummaryAddressCollection::CollectionContentType objectType );
+        plotsForOneInstanceOfObjectType( const std::vector<RimSummaryPlot*>&                sourcePlots,
+                                         RimSummaryAddressCollection::CollectionContentType objectType );
+
     static bool isSelectionCompatibleWithPlot( const std::vector<RimSummaryAddressCollection*>& selection,
                                                RimSummaryMultiPlot*                             summaryMultiPlot );
 
     static void appendPlots( RimSummaryMultiPlot*                             summaryMultiPlot,
                              const std::vector<RimSummaryAddressCollection*>& selection );
 
+    static void appendPlots( RimSummaryMultiPlot*                          summaryMultiPlot,
+                             const std::vector<RimSummaryCase*>&           cases,
+                             const std::vector<RimSummaryCaseCollection*>& ensembles );
+
 protected:
     bool isCommandEnabled() override;
     void onActionTriggered( bool isChecked ) override;
     void setupActionLook( QAction* actionToSetup ) override;
 
 private:
+    static std::vector<RimSummaryAddressCollection*>
+        createAddressCollections( const std::vector<RimSummaryCase*>&           cases,
+                                  const std::vector<RimSummaryCaseCollection*>& ensembles );
+
     static RifEclipseSummaryAddress modifyAddress( const RifEclipseSummaryAddress& sourceAddress,
                                                    RimSummaryAddressCollection*    summaryAddressCollection );
 };
diff --git a/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForSummaryCasesFeature.cpp b/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForSummaryCasesFeature.cpp
index 364dcc799b..7959b10957 100644
--- a/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForSummaryCasesFeature.cpp
+++ b/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForSummaryCasesFeature.cpp
@@ -24,6 +24,7 @@
 
 #include "RimSummaryAddressCollection.h"
 #include "RimSummaryCase.h"
+#include "RimSummaryCaseCollection.h"
 #include "RimSummaryMultiPlot.h"
 
 #include "cafSelectionManager.h"
@@ -32,39 +33,17 @@
 
 CAF_CMD_SOURCE_INIT( RicAppendSummaryPlotsForSummaryCasesFeature, "RicAppendSummaryPlotsForSummaryCasesFeature" );
 
-//--------------------------------------------------------------------------------------------------
-///
-//--------------------------------------------------------------------------------------------------
-void RicAppendSummaryPlotsForSummaryCasesFeature::appendPlotsForCases( RimSummaryMultiPlot* summaryMultiPlot,
-                                                                       const std::vector<RimSummaryCase*>& cases )
-{
-    if ( !summaryMultiPlot ) return;
-    if ( cases.empty() ) return;
-
-    std::vector<RimSummaryAddressCollection*> tmp;
-
-    for ( auto c : cases )
-    {
-        auto myColl = new RimSummaryAddressCollection;
-        myColl->setContentType( RimSummaryAddressCollection::CollectionContentType::SUMMARY_CASE );
-        myColl->setCaseId( c->caseId() );
-        tmp.push_back( myColl );
-    }
-
-    RicAppendSummaryPlotsForObjectsFeature::appendPlots( summaryMultiPlot, tmp );
-
-    for ( auto obj : tmp )
-    {
-        delete obj;
-    }
-}
-
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
 bool RicAppendSummaryPlotsForSummaryCasesFeature::isCommandEnabled()
 {
-    return !selectedCases().empty();
+    auto cases     = selectedCases();
+    auto ensembles = selectedEnsembles();
+
+    if ( cases.empty() && ensembles.empty() ) return false;
+
+    return true;
 }
 
 //--------------------------------------------------------------------------------------------------
@@ -77,10 +56,10 @@ void RicAppendSummaryPlotsForSummaryCasesFeature::onActionTriggered( bool isChec
     auto summaryMultiPlot = dynamic_cast<RimSummaryMultiPlot*>( app->activePlotWindow() );
     if ( !summaryMultiPlot ) return;
 
-    auto cases = selectedCases();
-    if ( cases.empty() ) return;
+    auto cases     = selectedCases();
+    auto ensembles = selectedEnsembles();
 
-    appendPlotsForCases( summaryMultiPlot, cases );
+    RicAppendSummaryPlotsForObjectsFeature::appendPlots( summaryMultiPlot, cases, ensembles );
 }
 
 //--------------------------------------------------------------------------------------------------
@@ -105,3 +84,14 @@ std::vector<RimSummaryCase*> RicAppendSummaryPlotsForSummaryCasesFeature::select
 
     return objects;
 }
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+std::vector<RimSummaryCaseCollection*> RicAppendSummaryPlotsForSummaryCasesFeature::selectedEnsembles()
+{
+    std::vector<RimSummaryCaseCollection*> objects;
+    caf::SelectionManager::instance()->objectsByType( &objects );
+
+    return objects;
+}
diff --git a/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForSummaryCasesFeature.h b/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForSummaryCasesFeature.h
index ab1c6acd96..f202d32311 100644
--- a/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForSummaryCasesFeature.h
+++ b/ApplicationLibCode/Commands/PlotBuilderCommands/RicAppendSummaryPlotsForSummaryCasesFeature.h
@@ -24,6 +24,7 @@
 
 class RimSummaryCase;
 class RimSummaryMultiPlot;
+class RimSummaryCaseCollection;
 
 //==================================================================================================
 ///
@@ -32,14 +33,12 @@ class RicAppendSummaryPlotsForSummaryCasesFeature : public caf::CmdFeature
 {
     CAF_CMD_HEADER_INIT;
 
-public:
-    static void appendPlotsForCases( RimSummaryMultiPlot* summaryMultiPlot, const std::vector<RimSummaryCase*>& cases );
-
 protected:
     bool isCommandEnabled() override;
     void onActionTriggered( bool isChecked ) override;
     void setupActionLook( QAction* actionToSetup ) override;
 
 private:
-    static std::vector<RimSummaryCase*> selectedCases();
+    static std::vector<RimSummaryCase*>           selectedCases();
+    static std::vector<RimSummaryCaseCollection*> selectedEnsembles();
 };
diff --git a/ApplicationLibCode/ProjectDataModel/RimContextCommandBuilder.cpp b/ApplicationLibCode/ProjectDataModel/RimContextCommandBuilder.cpp
index 7a979e476e..dbb0c0db8e 100644
--- a/ApplicationLibCode/ProjectDataModel/RimContextCommandBuilder.cpp
+++ b/ApplicationLibCode/ProjectDataModel/RimContextCommandBuilder.cpp
@@ -777,6 +777,8 @@ caf::CmdFeatureMenuBuilder RimContextCommandBuilder::commandsFromSelection()
             menuBuilder << "RicNewDerivedEnsembleFeature";
             menuBuilder << "RicOpenSummaryPlotEditorFeature";
             menuBuilder << "RicNewSummaryCrossPlotFeature";
+            menuBuilder << "RicAppendSummaryCurvesForSummaryCasesFeature";
+            menuBuilder << "RicAppendSummaryPlotsForSummaryCasesFeature";
             menuBuilder.addSeparator();
             menuBuilder << "RicConvertGroupToEnsembleFeature";
             menuBuilder.addSeparator();
diff --git a/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryCurveAppearanceCalculator.cpp b/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryCurveAppearanceCalculator.cpp
index 6539a32574..fdf551096f 100644
--- a/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryCurveAppearanceCalculator.cpp
+++ b/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryCurveAppearanceCalculator.cpp
@@ -396,18 +396,21 @@ cvf::Color3f RimSummaryCurveAppearanceCalculator::computeTintedCurveColorForAddr
 {
     bool usePhaseColor = RiaPreferencesSummary::current()->colorCurvesByPhase();
 
+    float        scalingFactor = 0.25;
     cvf::Color3f curveColor;
+
     if ( usePhaseColor )
     {
-        curveColor = RimSummaryCurveAppearanceCalculator::assignColorByPhase( address );
+        // A negative scaling factor will make the color darker
+        scalingFactor = -0.1 * colorIndex;
+        curveColor    = RimSummaryCurveAppearanceCalculator::assignColorByPhase( address );
     }
     else
     {
         curveColor = RiaColorTables::summaryCurveDefaultPaletteColors().cycledColor3f( colorIndex );
     }
 
-    float scalingFactor = 0.25;
-    curveColor          = RiaColorTools::makeLighter( curveColor, scalingFactor );
+    curveColor = RiaColorTools::makeLighter( curveColor, scalingFactor );
     return curveColor;
 }
 
diff --git a/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryMultiPlot.cpp b/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryMultiPlot.cpp
index 056c310ad1..f5b9f18074 100644
--- a/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryMultiPlot.cpp
+++ b/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryMultiPlot.cpp
@@ -222,6 +222,7 @@ void RimSummaryMultiPlot::handleDroppedObjects( const std::vector<caf::PdmObject
     std::vector<RimSummaryAddress*>           addresses;
     std::vector<RimSummaryAddressCollection*> addressCollections;
     std::vector<RimSummaryCase*>              cases;
+    std::vector<RimSummaryCaseCollection*>    ensembles;
 
     for ( auto o : objects )
     {
@@ -243,11 +244,13 @@ void RimSummaryMultiPlot::handleDroppedObjects( const std::vector<caf::PdmObject
 
         auto summaryCase = dynamic_cast<RimSummaryCase*>( o );
         if ( summaryCase ) cases.push_back( summaryCase );
+        auto ensemble = dynamic_cast<RimSummaryCaseCollection*>( o );
+        if ( ensemble ) ensembles.push_back( ensemble );
     }
 
     RicAppendSummaryPlotsForSummaryAddressesFeature::appendPlotsForAddresses( this, addresses );
     RicAppendSummaryPlotsForObjectsFeature::appendPlots( this, addressCollections );
-    RicAppendSummaryPlotsForSummaryCasesFeature::appendPlotsForCases( this, cases );
+    RicAppendSummaryPlotsForObjectsFeature::appendPlots( this, cases, ensembles );
 }
 
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryPlot.cpp b/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryPlot.cpp
index e8c9f5805d..a5137c7a63 100644
--- a/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryPlot.cpp
+++ b/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryPlot.cpp
@@ -770,22 +770,7 @@ size_t RimSummaryPlot::singleColorCurveCount() const
 void RimSummaryPlot::applyDefaultCurveAppearances()
 {
     applyDefaultCurveAppearances( summaryCurves() );
-
-    // Ensemble curve sets
-    int colorIndex = 0;
-    for ( auto& curveSet : this->ensembleCurveSetCollection()->curveSets() )
-    {
-        if ( curveSet->colorMode() != RimEnsembleCurveSet::ColorMode::SINGLE_COLOR ) continue;
-
-        cvf::Color3f curveColor =
-            RimSummaryCurveAppearanceCalculator::computeTintedCurveColorForAddress( curveSet->summaryAddress(),
-                                                                                    colorIndex++ );
-
-        auto adr = curveSet->summaryAddress();
-        if ( adr.isHistoryVector() ) curveColor = RiaPreferencesSummary::current()->historyCurveContrastColor();
-
-        curveSet->setColor( curveColor );
-    }
+    applyDefaultCurveAppearances( ensembleCurveSetCollection()->curveSets() );
 }
 
 //--------------------------------------------------------------------------------------------------
@@ -803,6 +788,36 @@ void RimSummaryPlot::applyDefaultCurveAppearances( std::vector<RimSummaryCurve*>
     }
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimSummaryPlot::applyDefaultCurveAppearances( std::vector<RimEnsembleCurveSet*> ensembleCurvesToUpdate )
+{
+    auto allCurveSets = ensembleCurveSetCollection()->curveSets();
+
+    for ( auto curveSet : ensembleCurvesToUpdate )
+    {
+        size_t colorIndex = 0;
+
+        auto it = std::find( allCurveSets.begin(), allCurveSets.end(), curveSet );
+        if ( it != allCurveSets.end() )
+        {
+            colorIndex = std::distance( allCurveSets.begin(), it );
+        }
+
+        if ( curveSet->colorMode() != RimEnsembleCurveSet::ColorMode::SINGLE_COLOR ) continue;
+
+        cvf::Color3f curveColor =
+            RimSummaryCurveAppearanceCalculator::computeTintedCurveColorForAddress( curveSet->summaryAddress(),
+                                                                                    static_cast<int>( colorIndex ) );
+
+        auto adr = curveSet->summaryAddress();
+        if ( adr.isHistoryVector() ) curveColor = RiaPreferencesSummary::current()->historyCurveContrastColor();
+
+        curveSet->setColor( curveColor );
+    }
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
@@ -1997,6 +2012,34 @@ std::pair<int, std::vector<RimSummaryCurve*>> RimSummaryPlot::handleSummaryCaseD
     return { newCurves, curves };
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+std::pair<int, std::vector<RimEnsembleCurveSet*>> RimSummaryPlot::handleEnsembleDrop( RimSummaryCaseCollection* ensemble )
+{
+    int                               newCurves = 0;
+    std::vector<RimEnsembleCurveSet*> curveSetsToUpdate;
+
+    std::map<RifEclipseSummaryAddress, std::set<RimSummaryCaseCollection*>> dataVectorMap;
+
+    for ( auto& curve : curveSets() )
+    {
+        const auto addr = curve->summaryAddress();
+        dataVectorMap[addr].insert( curve->summaryCaseCollection() );
+    }
+
+    for ( const auto& [addr, ensembles] : dataVectorMap )
+    {
+        if ( ensembles.count( ensemble ) > 0 ) continue;
+
+        auto curveSet = addNewEnsembleCurveY( addr, ensemble );
+        curveSetsToUpdate.push_back( curveSet );
+        newCurves++;
+    }
+
+    return { newCurves, curveSetsToUpdate };
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
@@ -2195,8 +2238,9 @@ std::pair<int, std::vector<RimSummaryCurve*>> RimSummaryPlot::handleSummaryAddre
 //--------------------------------------------------------------------------------------------------
 void RimSummaryPlot::handleDroppedObjects( const std::vector<caf::PdmObjectHandle*>& objects )
 {
-    int                           accumulatedCurveCount = 0;
-    std::vector<RimSummaryCurve*> curvesToUpdate;
+    int                               accumulatedCurveCount = 0;
+    std::vector<RimSummaryCurve*>     curvesToUpdate;
+    std::vector<RimEnsembleCurveSet*> curveSetsToUpdate;
 
     for ( auto obj : objects )
     {
@@ -2208,6 +2252,14 @@ void RimSummaryPlot::handleDroppedObjects( const std::vector<caf::PdmObjectHandl
             curvesToUpdate.insert( curvesToUpdate.end(), curvesCreated.begin(), curvesCreated.end() );
             continue;
         }
+        auto ensemble = dynamic_cast<RimSummaryCaseCollection*>( obj );
+        if ( ensemble )
+        {
+            auto [curveCount, curvesCreated] = handleEnsembleDrop( ensemble );
+            accumulatedCurveCount += curveCount;
+            curveSetsToUpdate.insert( curveSetsToUpdate.end(), curvesCreated.begin(), curvesCreated.end() );
+            continue;
+        }
 
         auto summaryAddr = dynamic_cast<RimSummaryAddress*>( obj );
         if ( summaryAddr )
@@ -2244,6 +2296,7 @@ void RimSummaryPlot::handleDroppedObjects( const std::vector<caf::PdmObjectHandl
     if ( accumulatedCurveCount > 0 )
     {
         applyDefaultCurveAppearances( curvesToUpdate );
+        applyDefaultCurveAppearances( curveSetsToUpdate );
 
         loadDataAndUpdate();
 
@@ -2269,7 +2322,8 @@ RimSummaryCurve* RimSummaryPlot::addNewCurveY( const RifEclipseSummaryAddress& a
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
-void RimSummaryPlot::addNewEnsembleCurveY( const RifEclipseSummaryAddress& address, RimSummaryCaseCollection* ensemble )
+RimEnsembleCurveSet* RimSummaryPlot::addNewEnsembleCurveY( const RifEclipseSummaryAddress& address,
+                                                           RimSummaryCaseCollection*       ensemble )
 {
     auto* curveSet = new RimEnsembleCurveSet();
 
@@ -2288,6 +2342,8 @@ void RimSummaryPlot::addNewEnsembleCurveY( const RifEclipseSummaryAddress& addre
     curveSet->setColor( curveColor );
 
     ensembleCurveSetCollection()->addCurveSet( curveSet );
+
+    return curveSet;
 }
 
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryPlot.h b/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryPlot.h
index b22152d220..fa79ba1b63 100644
--- a/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryPlot.h
+++ b/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryPlot.h
@@ -165,6 +165,7 @@ public:
     size_t singleColorCurveCount() const;
     void   applyDefaultCurveAppearances();
     void   applyDefaultCurveAppearances( std::vector<RimSummaryCurve*> curvesToUpdate );
+    void   applyDefaultCurveAppearances( std::vector<RimEnsembleCurveSet*> ensembleCurvesToUpdate );
 
     void setNormalizationEnabled( bool enable );
     bool isNormalizationEnabled();
@@ -288,13 +289,14 @@ private:
     void assignPlotAxis( RimSummaryCurve* curve );
 
     RimSummaryCurve* addNewCurveY( const RifEclipseSummaryAddress& address, RimSummaryCase* summaryCase );
-    void addNewEnsembleCurveY( const RifEclipseSummaryAddress& address, RimSummaryCaseCollection* ensemble );
+    RimEnsembleCurveSet* addNewEnsembleCurveY( const RifEclipseSummaryAddress& address, RimSummaryCaseCollection* ensemble );
 
     void updateStackedCurveData();
     bool updateStackedCurveDataForAxis( RiuPlotAxis plotAxis );
     bool updateStackedCurveDataForRelevantAxes();
 
-    std::pair<int, std::vector<RimSummaryCurve*>> handleSummaryCaseDrop( RimSummaryCase* summaryCase );
+    std::pair<int, std::vector<RimSummaryCurve*>>     handleSummaryCaseDrop( RimSummaryCase* summaryCase );
+    std::pair<int, std::vector<RimEnsembleCurveSet*>> handleEnsembleDrop( RimSummaryCaseCollection* ensemble );
     std::pair<int, std::vector<RimSummaryCurve*>> handleAddressCollectionDrop( RimSummaryAddressCollection* addrColl );
     std::pair<int, std::vector<RimSummaryCurve*>> handleSummaryAddressDrop( RimSummaryAddress* summaryAddr );