diff --git a/bin/Powheg/runcmsgrid.sh b/bin/Powheg/runcmsgrid.sh
new file mode 100755
index 000000000000..78a95ceaa23b
--- /dev/null
+++ b/bin/Powheg/runcmsgrid.sh
@@ -0,0 +1,263 @@
+#!/bin/bash
+
+fail_exit() { echo "$@"; exit 1; }
+
+# #set -o verbose
+# EXPECTED_ARGS=3
+
+# if [ $# -ne $EXPECTED_ARGS ]
+# then
+    # echo "Usage: `basename $0` Nevents RandomSeed cpu"
+    # echo "Example: `basename $0` 1000 1212 cpu" 
+    # exit 1
+# fi
+
+echo "   ______________________________________     "
+echo "         Running Powheg                       "
+echo "   ______________________________________     "
+
+nevt=${1}
+echo "%MSG-POWHEG number of events requested = $nevt"
+
+rnum=${2}
+echo "%MSG-POWHEG random seed used for the run = $rnum"
+
+ncpu=${3}
+echo "%MSG-POWHEG number of cputs for the run = $ncpu"
+
+LHEWORKDIR=`pwd`
+
+use_gridpack_env=true
+if [ -n "$4" ]
+  then
+  use_gridpack_env=$4
+fi
+
+if [ "$use_gridpack_env" = true ]
+  then
+    if [ -n "$5" ]
+      then
+        scram_arch_version=${5}
+      else
+        scram_arch_version=slc7_amd64_gcc10
+    fi
+    echo "%MSG-POWHEG SCRAM_ARCH version = $scram_arch_version"
+
+    if [ -n "$6" ]
+      then
+        cmssw_version=${6}
+      else
+        cmssw_version=CMSSW_12_6_5
+    fi
+    echo "%MSG-POWHEG CMSSW version = $cmssw_version"
+    export VO_CMS_SW_DIR=/cvmfs/cms.cern.ch
+    source $VO_CMS_SW_DIR/cmsset_default.sh
+    export SCRAM_ARCH=${scram_arch_version}
+    scramv1 project CMSSW ${cmssw_version}
+    cd ${cmssw_version}/src
+    eval `scramv1 runtime -sh`
+fi
+cd $LHEWORKDIR
+
+seed=$rnum
+file="cmsgrid"
+
+process="ggHZ"
+
+# Release to be used to define the environment and the compiler needed
+export WORKDIR=`pwd`
+
+# LHAPDF setup
+LHAPDFCONFIG=`echo "$LHAPDF_DATA_PATH/../../bin/lhapdf-config"`
+#if lhapdf6 external is available then above points to lhapdf5 and needs to be overridden
+LHAPDF6TOOLFILE=$CMSSW_BASE/config/toolbox/$SCRAM_ARCH/tools/available/lhapdf6.xml
+if [ -e $LHAPDF6TOOLFILE ]; then
+  LHAPDFCONFIG=`cat $LHAPDF6TOOLFILE | grep "<environment name=\"LHAPDF6_BASE\"" | cut -d \" -f 4`/bin/lhapdf-config
+fi
+#make sure env variable for pdfsets points to the right place
+export LHAPDF_DATA_PATH=`$LHAPDFCONFIG --datadir`
+
+# initialize the CMS environment 
+myDir=powhegbox_${process}
+card=${WORKDIR}/powheg.input
+
+if [[ -e ${myDir} ]]; then
+  echo -e "The directory ${myDir} exists! Move the directory to old_${myDir}\n"
+  mv ${myDir} old_${myDir}
+  mv cmsgrid_final.lhe old_cmsgrid_final.lhe
+fi
+
+export LD_LIBRARY_PATH=`pwd`/lib/:`pwd`/lib64/:`pwd`/obj-gfortran/proclib/:${LD_LIBRARY_PATH}
+if [[ "${process}" == "WWJ" ]]; then
+  export LD_LIBRARY_PATH=`pwd`/MATRIXStuff/external/ginac-install/lib/:`pwd`/MATRIXStuff/external/cln-install/lib/:`pwd`/MATRIXStuff/lib/ppllll24/:${LD_LIBRARY_PATH}
+fi
+
+mkdir ${myDir}; cd ${myDir} ;  
+export PYTHONPATH=.:${PYTHONPATH}
+
+# force the f77 compiler to be the CMS defined one
+#ln -s `which gfortran` f77
+#ln -s `which gfortran` g77
+export PATH=`pwd`:${PATH}
+
+if [[ -e ${WORKDIR}/pwggrid.dat ]]; then
+    cp -p ${WORKDIR}/pwg*.dat .
+fi
+if [ -e  ${WORKDIR}/vbfnlo.input ]; then
+    cp -p ${WORKDIR}/vbfnlo.input .
+fi
+if [ -e ${WORKDIR}/br.a3_2HDM ]; then
+  cp -p ${WORKDIR}/br*2HDM .
+fi
+if [ -e  ${WORKDIR}/powheg-fh.in ]; then
+  cp -p ${WORKDIR}/powheg-fh.in .
+fi
+### For the ggHH process
+if [[ "${process}" == "ggHH" ]]; then
+    ln -s ${WORKDIR}/Virt* .
+    ln -s ${WORKDIR}/creategrid.py .
+    cp -p ${WORKDIR}/events.cdf .
+fi
+
+if [ "${process}" == "X0jj" ]; then
+    cp -p ${WORKDIR}/MadLoopParams.dat .
+    for f in `ls ${WORKDIR}/MG5_aMC_v2_6_7/X0jj/SubProcesses/MadLoop5_resources/*`
+    do
+	ln -sf $f ./
+    done
+fi
+
+if [[ ! -e ${card} ]]; then
+ fail_exit "powheg.input not found!"
+fi
+
+cat ${card} | sed -e "s#SEED#${seed}#g" | sed -e "s#NEVENTS#${nevt}#g" > powheg.input
+
+# Check if the powheg.input file contains the proper settings to calculate weights
+
+produceWeights="false" 
+
+grep -q "storeinfo_rwgt 1" powheg.input ; test $? -eq 0  || produceWeights="false"
+grep -q "pdfreweight 1" powheg.input ; test $? -eq 0 || produceWeights="false"
+grep -q "first runx" powheg.input ; test $? -ne 0 || produceWeights="true"
+
+cat powheg.input
+../pwhg_main &> log_${process}_${seed}.txt; test $? -eq 0 || fail_exit "pwhg_main error: exit code not 0"
+
+if [ "${process}" == "X0jj" ]; then
+    # now run reweighting for X0jj process
+    # also need to modify powheg.input inbetween these calls
+    cp powheg.input powheg.input.noweight
+    sed -nir '/compute_rwgt/!p;$acompute_rwgt 1' powheg.input
+
+    # sm weight
+    sed -nir '/lhrwgt_id/!p;$alhrwgt_id '\''sm_weight'\''' powheg.input
+    sed -nir '/MGcosa/!p;$aMGcosa    1d0' powheg.input
+    ../pwhg_main 2>&1 | tee logrew_${process}_${seed}_sm.txt; test $? -eq 0 || fail_exit "pwhg_main error: exit code not 0"
+    mv pwgevents-rwgt.lhe pwgevents.lhe
+
+    # ps weight
+    sed -nir '/lhrwgt_id/!p;$alhrwgt_id '\''ps_weight'\''' powheg.input
+    sed -nir '/MGcosa/!p;$aMGcosa    0d0' powheg.input
+    ../pwhg_main 2>&1 | tee logrew_${process}_${seed}_ps.txt; test $? -eq 0 || fail_exit "pwhg_main error: exit code not 0"
+    mv pwgevents-rwgt.lhe pwgevents.lhe
+
+    # mm weight
+    sed -nir '/lhrwgt_id/!p;$alhrwgt_id '\''mm_weight'\''' powheg.input
+    sed -nir '/MGcosa/!p;$aMGcosa    -0.707107d0' powheg.input
+    ../pwhg_main 2>&1 | tee logrew_${process}_${seed}_mm.txt; test $? -eq 0 || fail_exit "pwhg_main error: exit code not 0"
+    mv pwgevents-rwgt.lhe pwgevents.lhe
+fi
+
+if [ "$produceWeightsNNLO" == "true" ]; then
+    echo -e "\ncomputing weights for NNLOPS\n"
+    mv pwgevents.lhe fornnlops
+    cp ../nnlopsreweighter.input .
+    cp ../HNNLO-11.top .
+    cp ../HNNLO-22.top .
+    cp ../HNNLO-0505.top .
+    ../nnlopsreweighter
+    mv fornnlops.nnlo pwgevents.lhe
+fi
+
+sed -e "/#new weight/d" -e "/<wgt id='c'>/d" -e "/<weight id='c'>/d" pwgevents.lhe > pwgevents.lhe.tmp
+mv pwgevents.lhe.tmp pwgevents.lhe 
+cp powheg.input powheg.input.noweight
+
+if [ "$produceWeights" == "true" ]; then
+
+   echo "   ______________________________________     "
+   echo "           Running HV_ew reweight             "
+   echo "   ______________________________________     "
+
+   cp pwgfullgrid-reg-00*.dat pwgfullgrid-reg.dat
+   echo "rwl_add 1" >> powheg.input
+   echo "rwl_group_events 2000" >> powheg.input
+   echo "lhapdf6maxsets 50" >> powheg.input
+   echo "rwl_file 'pwg-rwl.dat'" >> powheg.input
+   echo "rwl_format_rwgt 1" >> powheg.input
+   sed -i -e "s#select_EW#\#select_EW#g" powheg.input
+   echo "select_EW_virt 1" >> powheg.input
+
+   ../pwhg_main &> logrew_${process}_${seed}.txt; test $? -eq 0 || fail_exit "pwhg_main error: exit code not 0"
+   cat pwgevents-rwgt.lhe | grep -v "Random number generator exit values" > ${file}_final.lhe
+else 
+   cat pwgevents.lhe | grep -v "Random number generator exit values" > ${file}_final.lhe
+fi
+
+rm -rf powheg.input*
+
+echo -e "\n finished computing weights ..\n" 
+
+xmllint --stream --noout ${file}_final.lhe > /dev/null 2>&1; test $? -eq 0 || fail_exit "xmllint integrity check failed on pwgevents.lhe"
+
+grep ">        NaN</wgt>" ${file}_final.lhe; test $? -ne 0 || fail_exit "Weights equal to NaN found, there must be a problem in the reweighting"
+
+# uncomment to avoid problems in production as whole job would fail and problem traced back to neg. PDFs 
+# grep ">0.00000E+00</wgt>" ${file}_final.lhe; test $? -ne 0 || fail_exit "Weights equal to 0 found, there must be a problem in the reweighting"
+
+ls -l ${file}_final.lhe
+sed -i 's/Input file powheg.input contained:/Process: '$process'\nInput file powheg.input contained:/g' ${file}_final.lhe
+pwd
+cp ${file}_final.lhe ${WORKDIR}/${file}_tmp.lhe
+cd ${WORKDIR}
+partialcommand=`cat JHUGen.input`
+jhugencommand="./JHUGen $partialcommand ReadLHE=${file}_tmp.lhe DataFile=${file}_final Seed=${seed}"
+########################
+#backwards compatibility
+jhugencommand=$(echo $jhugencommand | sed "s/Seed=SEED//g")
+########################
+echo ${jhugencommand}
+${jhugencommand}
+
+if [ -s pwgstat.dat ]; then
+  mv pwgstat.dat pwg-stat.dat
+fi
+
+if [ -s pwg-stat.dat ]; then
+  if [ "$process" = "b_bbar_4l" ] || [ "$process" = "HWJ_ew" ] || [ "$process" = "HW_ew" ] || [ "$process" = "HZJ_ew" ] || [ "$process" = "HZ_ew" ] || [ "$process" = "WWJ" ]; then
+    XSECTION=`tac pwg-stat.dat | grep total\ total | awk '{ print $(NF-2) }'`
+    XSECUNC=` tac pwg-stat.dat | grep total\ total | awk '{ print $(NF) }'`
+  else
+    XSECTION=`tac pwg-stat.dat | grep -m1 in\ pb | awk '{ print $(NF-2) }'`
+    XSECUNC=` tac pwg-stat.dat | grep -m1 in\ pb | awk '{ print $(NF) }'`
+  fi
+  head=`cat   cmsgrid_final.lhe | grep -in "<init>" | sed "s@:@ @g" | awk '{print $1+1}' | tail -1`
+  tail=`wc -l cmsgrid_final.lhe | awk -v tmp="$head" '{print $1-2-tmp}'`
+  tail -${tail} cmsgrid_final.lhe                           >  cmsgrid_final.lhe_tail
+  head -${head} cmsgrid_final.lhe                           >  cmsgrid_final.lhe_F
+  proclin=`expr $head + 1`
+  proc=`sed -n -e ${proclin}p  cmsgrid_final.lhe |  awk '{print $4}'`
+  echo "  "$XSECTION"   "$XSECUNC"  1.00000000000E-00 "$proc >>  cmsgrid_final.lhe_F
+  echo "</init>"                                           >>  cmsgrid_final.lhe_F
+  cat cmsgrid_final.lhe_tail                               >>  cmsgrid_final.lhe_F
+  mv cmsgrid_final.lhe_F cmsgrid_final.lhe
+fi
+#Replace the negative so pythia will work
+sed "s@-1000021@ 1000022@g" cmsgrid_final.lhe           > cmsgrid_final.lhe_F1
+sed "s@1000021@1000022@g"   cmsgrid_final.lhe_F1          > cmsgrid_final.lhe
+cp ${file}_final.lhe ${WORKDIR}/.
+
+echo "Output ready with ${file}_final.lhe at $WORKDIR"
+echo "End of job on " `date`
+exit 0;