diff --git a/Detector/Calo/include/Detector/Calo/CellParam.h b/Detector/Calo/include/Detector/Calo/CellParam.h
index 7f13b5b26bdc6062a9cd96c628b7e21f657200c2..d73adeb47cd0e36eb95fcb82f4f49aeeb16f805a 100644
--- a/Detector/Calo/include/Detector/Calo/CellParam.h
+++ b/Detector/Calo/include/Detector/Calo/CellParam.h
@@ -82,6 +82,7 @@ namespace LHCb::Detector::Calo {
     double pileUpOffsetSPD() const { return m_offsetSPD; }
     double pileUpOffsetRMS() const { return m_eoffset; }
     double pileUpOffsetSPDRMS() const { return m_eoffsetSPD; }
+    double Gamma() const { return m_gamma; }
 
     const std::vector<LHCb::Detector::Calo::CellID>& pins() const { return m_pins; }
     const std::vector<int>&                          leds() const { return m_leds; }
@@ -142,6 +143,7 @@ namespace LHCb::Detector::Calo {
       m_offsetSPD  = off;
       m_eoffsetSPD = eoff;
     }
+    void setGamma( double gamma ) { m_gamma = gamma; }
 
     std::string cellStatus() {
       if ( (CellQuality::Flag)m_quality == CellQuality::OK ) return CellQuality::qName( CellQuality::OK );
@@ -188,6 +190,7 @@ namespace LHCb::Detector::Calo {
     double                                    m_eoffset{ 0.0 };
     double                                    m_offsetSPD{ 0.0 };
     double                                    m_eoffsetSPD{ 0.0 };
+    double                                    m_gamma{ 0.0 };
   };
 
 } // namespace LHCb::Detector::Calo
diff --git a/Detector/Calo/include/Detector/Calo/DeCalorimeter.h b/Detector/Calo/include/Detector/Calo/DeCalorimeter.h
index 2c5bfb5b75244c9a2485f3c1bf5860f06226101c..9700914fa749bc7ff4d2ef9bd764d9ae0c53894e 100644
--- a/Detector/Calo/include/Detector/Calo/DeCalorimeter.h
+++ b/Detector/Calo/include/Detector/Calo/DeCalorimeter.h
@@ -240,6 +240,7 @@ namespace LHCb::Detector::Calo {
     double gainError() const { return this->access()->gainError; }
 
     double getCalibration( const CellID& ID ) const { return this->access()->cells[ID].calibration(); }
+    double getGamma( const CellID& ID ) const { return this->access()->cells[ID].Gamma(); }
 
     // for simulation only
     int    zSupMethod() const { return this->access()->zSupMethod; }
diff --git a/Detector/Calo/src/DeCalorimeter.cpp b/Detector/Calo/src/DeCalorimeter.cpp
index d48128bbed35df8cb5148281d20564f6a6be325b..6b015f070aa259359a2993b19d78e98f5195a74e 100644
--- a/Detector/Calo/src/DeCalorimeter.cpp
+++ b/Detector/Calo/src/DeCalorimeter.cpp
@@ -683,6 +683,41 @@ detail::DeCaloObject::DeCaloObject( dd4hep::DetElement const& de, dd4hep::cond::
     dd4hep::printout( dd4hep::DEBUG, "DeCalorimeter", "Pileup offset added for %d channel(s)", countPU );
   }
 
+  //----------------------------------------------
+  // ** Gamma for ECAL energy
+  //----------------------------------------------
+  if ( isEcal ) {
+    auto condgammas = ctxt.condition( hash_key( de, "Gammas" ), false );
+    if ( !condgammas.isValid() ) {
+      dd4hep::printout( dd4hep::DEBUG, "DeCalorimeter", "Condition 'Gammas' is not defined, assuming 0.0" );
+    } else {
+      const auto& gammas = condgammas.get<nlohmann::json>();
+      if ( gammas.is_null() ) {
+        dd4hep::printout( dd4hep::DEBUG, "DeCalorimeter", "Condition 'Gammas' is null, assuming 0.0" );
+      } else {
+        auto cellsGammas = gammas["data"].get<std::vector<std::vector<double>>>();
+        dd4hep::printout( dd4hep::DEBUG, "DeCalorimeter", "Gammas for ECAL energy" );
+        int countGammas = 0;
+        for ( auto& cellGammas : cellsGammas ) {
+          double                       cell  = cellGammas[0];
+          double                       gamma = cellGammas[1];
+          LHCb::Detector::Calo::CellID id    = LHCb::Detector::Calo::CellID( (int)cell );
+          id.setCalo( index );
+          if ( cells[id].valid() ) {
+            cells[id].setGamma( gamma );
+            dd4hep::printout( dd4hep::DEBUG, "DeCalorimeter", "Added gamma for channel %s : gamma = %f",
+                              id.asString().c_str(), gamma );
+          } else {
+            dd4hep::printout( dd4hep::WARNING, "DeCalorimeter", "Trying to add gamma on non-valid channel : %s",
+                              id.asString().c_str() );
+          }
+          countGammas++;
+        }
+        dd4hep::printout( dd4hep::DEBUG, "DeCalorimeter", "Gamma added for %d channel(s)", countGammas );
+      }
+    }
+  }
+
   bool nominal   = false;
   int  countGain = 0;
   // Nominal Gain parameters
diff --git a/compact/components/ECAL/2024-v00.00/conditions.xml b/compact/components/ECAL/2024-v00.00/conditions.xml
index e1fb242e9c1ee5aa960332ea99e9096b29a58007..5a0f2677349af685d0dce9335537bf825d263a33 100644
--- a/compact/components/ECAL/2024-v00.00/conditions.xml
+++ b/compact/components/ECAL/2024-v00.00/conditions.xml
@@ -18,6 +18,7 @@
       <conditions path="Calibration.yml">
         <condition name="Calibration"/>
         <condition name="Gain"/>
+        <condition name="Gammas" optional="1"/>
         <condition name="L0Calibration"/>
         <condition name="LEDReference"/>
         <condition name="PileUpOffset"/>
diff --git a/compact/components/ECAL/trunk/conditions.xml b/compact/components/ECAL/trunk/conditions.xml
index e1fb242e9c1ee5aa960332ea99e9096b29a58007..5a0f2677349af685d0dce9335537bf825d263a33 100644
--- a/compact/components/ECAL/trunk/conditions.xml
+++ b/compact/components/ECAL/trunk/conditions.xml
@@ -18,6 +18,7 @@
       <conditions path="Calibration.yml">
         <condition name="Calibration"/>
         <condition name="Gain"/>
+        <condition name="Gammas" optional="1"/>
         <condition name="L0Calibration"/>
         <condition name="LEDReference"/>
         <condition name="PileUpOffset"/>
diff --git a/tests/ConditionsIOV/.schema.json b/tests/ConditionsIOV/.schema.json
index bc6ed3ac935663cfdd7135edf93a109ce858b3f7..461400c57bfe5b94d222ad0b1133587492b9199b 100644
--- a/tests/ConditionsIOV/.schema.json
+++ b/tests/ConditionsIOV/.schema.json
@@ -9,7 +9,8 @@
     "LEDReference",
     "PileUpOffset",
     "Quality",
-    "Reco"
+    "Reco",
+    "Gammas"
   ],
   "Conditions/Ecal/ReadoutConf.yml": [
     "Hardware",
diff --git a/tests/ConditionsIOV/Conditions/Ecal/Calibration.yml/0 b/tests/ConditionsIOV/Conditions/Ecal/Calibration.yml/0
index bb1ed13181cfcff6a3c5fa058825e294ef899218..f947db7a65627c0cff8da8a7d70333b694532225 100644
--- a/tests/ConditionsIOV/Conditions/Ecal/Calibration.yml/0
+++ b/tests/ConditionsIOV/Conditions/Ecal/Calibration.yml/0
@@ -12083,3 +12083,6 @@ Quality:
   size: 2
 Reco:
   ZShowerMax: -282.0
+Gammas:
+  data: []
+  size: 2