diff --git a/src/algorithms/reco/CalorimeterTotalFourMomentum.cc b/src/algorithms/reco/CalorimeterTotalFourMomentum.cc
new file mode 100644
index 0000000000..2b68ffcace
--- /dev/null
+++ b/src/algorithms/reco/CalorimeterTotalFourMomentum.cc
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
+// Copyright (C) 2024 Sebouh Pual
+#include "CalorimeterTotalFourMomentum.h"
+#include <edm4eic/ClusterCollection.h>
+#include <edm4hep/Vector4f.h>
+#include <math.h>
+#include <gsl/pointers>
+
+/**
+ Creates a pseudo particle containing the momenta and energies from all clusters in a given ClusterCollection.
+ The 3-momentum for each cluster is the energy of that cluster, in the direction from the origin to the
+ cluster position.  These 3-momenta, along with the energies of the clusters, are added together to form
+ the total four-momentum in the calorimeter system.
+
+ */
+
+namespace eicrecon {
+
+    void CalorimeterTotalFourMomentum::init() {  }
+
+    void CalorimeterTotalFourMomentum::process(const CalorimeterTotalFourMomentum::Input& input,
+                      const CalorimeterTotalFourMomentum::Output& output) const {
+
+      const auto [clusters] = input;
+      auto [hadronic_final_state] = output;
+
+      double Etot=0;
+      double pxtot=0;
+      double pytot=0;
+      double pztot=0;
+      for (const auto& cluster : *clusters) {
+          double E = cluster.getEnergy();
+          Etot+=E;
+          double x= cluster.getPosition().x;
+          double y= cluster.getPosition().y;
+          double z= cluster.getPosition().z;
+          double r=sqrt(x*x+y*y+z*z);
+          pxtot+=E*x/r;
+          pytot+=E*y/r;
+          pztot+=E*z/r;
+      }
+      auto hfs = hadronic_final_state->create();
+      hfs.setMomentum({(float)pxtot, (float)pytot, (float)pztot});
+      hfs.setEnergy((float)Etot);
+    }
+}
diff --git a/src/algorithms/reco/CalorimeterTotalFourMomentum.h b/src/algorithms/reco/CalorimeterTotalFourMomentum.h
new file mode 100644
index 0000000000..689da2c878
--- /dev/null
+++ b/src/algorithms/reco/CalorimeterTotalFourMomentum.h
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
+// Copyright (C) 2024 Sebouh Paul
+
+#pragma once
+
+#include <edm4eic/ClusterCollection.h>
+#include <edm4hep/Vector4f.h>
+#include <edm4eic/ReconstructedParticleCollection.h>
+#include <spdlog/logger.h>
+#include <memory>
+#include <string>                                 // for basic_string
+#include <string_view>                            // for string_view
+#include <algorithms/algorithm.h>
+#include "algorithms/interfaces/WithPodConfig.h"
+
+
+namespace eicrecon {
+
+using CalorimeterTotalFourMomentumAlgorithm = algorithms::Algorithm<
+   algorithms::Input<
+       const edm4eic::ClusterCollection
+    >,
+    algorithms::Output<
+       edm4eic::ReconstructedParticleCollection
+    >
+    >;
+    class CalorimeterTotalFourMomentum :
+       public CalorimeterTotalFourMomentumAlgorithm,
+       public WithPodConfig<NoConfig> {
+       public:
+         CalorimeterTotalFourMomentum(std::string_view name)
+                  : CalorimeterTotalFourMomentumAlgorithm{name,
+                                        {"inputClusters"},
+                                        {"totalFourMomentum"},
+                                        "Merges all clusters in a collection into a total 4-vector of momentum and energy"} {}
+
+         void init() final;
+         void process(const Input&, const Output&) const final;
+    private:
+        std::shared_ptr<spdlog::logger> m_log;
+    };
+} // namespace eicrecon
diff --git a/src/detectors/FHCAL/FHCAL.cc b/src/detectors/FHCAL/FHCAL.cc
index 2d796d1bdf..e9470809ca 100644
--- a/src/detectors/FHCAL/FHCAL.cc
+++ b/src/detectors/FHCAL/FHCAL.cc
@@ -17,6 +17,7 @@
 #include "factories/calorimetry/CalorimeterTruthClustering_factory.h"
 #include "factories/calorimetry/HEXPLIT_factory.h"
 #include "factories/calorimetry/ImagingTopoCluster_factory.h"
+#include "factories/reco/CalorimeterTotalFourMomentum_factory.h"
 
 extern "C" {
     void InitPlugin(JApplication *app) {
@@ -138,6 +139,18 @@ extern "C" {
           )
         );
 
+        app->Add(
+          new JOmniFactoryGeneratorT<CalorimeterTotalFourMomentum_factory>(
+             "HcalEndcapPInsertTotalFourMomentum",
+             {"HcalEndcapPInsertClusters"},  // edm4eic::Cluster
+             {"HcalEndcapPInsertTotalFourMomentum"}, // edm4eic::ReconstructedParticle
+            {
+
+            },
+            app   // TODO: Remove me once fixed
+          )
+        );
+
         // Make sure digi and reco use the same value
         decltype(CalorimeterHitDigiConfig::capADC)        LFHCAL_capADC = 65536;
         decltype(CalorimeterHitDigiConfig::dyRangeADC)    LFHCAL_dyRangeADC = 1 * dd4hep::GeV;
diff --git a/src/factories/reco/CalorimeterTotalFourMomentum_factory.h b/src/factories/reco/CalorimeterTotalFourMomentum_factory.h
new file mode 100644
index 0000000000..0474267494
--- /dev/null
+++ b/src/factories/reco/CalorimeterTotalFourMomentum_factory.h
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
+// Copyright (C) 2024 Sebouh Paul
+
+#pragma once
+
+#include "algorithms/reco/CalorimeterTotalFourMomentum.h"
+#include "services/algorithms_init/AlgorithmsInit_service.h"
+#include "extensions/jana/JOmniFactory.h"
+
+
+namespace eicrecon {
+
+class CalorimeterTotalFourMomentum_factory : public JOmniFactory<CalorimeterTotalFourMomentum_factory,NoConfig> {
+
+   using AlgoT = eicrecon::CalorimeterTotalFourMomentum;
+     private:
+         std::unique_ptr<AlgoT> m_algo;
+    PodioInput<edm4eic::Cluster> m_clusters_input {this};
+    PodioOutput<edm4eic::ReconstructedParticle> m_four_momentum_output {this};
+
+    Service<AlgorithmsInit_service> m_algorithmsInit {this};
+
+public:
+    void Configure() {
+        m_algo = std::make_unique<AlgoT>(GetPrefix());
+        m_algo->level((algorithms::LogLevel)logger()->level());
+        m_algo->applyConfig(config());
+        m_algo->init();
+    }
+
+    void ChangeRun(int64_t run_number) {
+    }
+
+    void Process(int64_t run_number, uint64_t event_number) {
+      m_algo->process({m_clusters_input()},{m_four_momentum_output().get()});
+    }
+};
+
+} // eicrecon
diff --git a/src/services/io/podio/JEventProcessorPODIO.cc b/src/services/io/podio/JEventProcessorPODIO.cc
index 7b36d2f66f..8d073282c1 100644
--- a/src/services/io/podio/JEventProcessorPODIO.cc
+++ b/src/services/io/podio/JEventProcessorPODIO.cc
@@ -212,7 +212,7 @@ JEventProcessorPODIO::JEventProcessorPODIO() {
 #if EDM4EIC_VERSION_MAJOR >= 6
             "HadronicFinalState",
 #endif
-
+            "HcalEndcapPInsertTotalFourMomentum",
             // Track projections
             "CalorimeterTrackProjections",