diff --git a/opm/simulators/flow/EclGenericWriter_impl.hpp b/opm/simulators/flow/EclGenericWriter_impl.hpp
index d6d1151534a..9a0f3b0bd87 100644
--- a/opm/simulators/flow/EclGenericWriter_impl.hpp
+++ b/opm/simulators/flow/EclGenericWriter_impl.hpp
@@ -285,6 +285,18 @@ extractOutputTransAndNNC(const std::function<unsigned int(unsigned int)>& map)
         auto cartMap = cartesianToCompressed(equilGrid_->size(0), UgGridHelpers::globalCell(*equilGrid_));
         computeTrans_(cartMap, map);
         exportNncStructure_(cartMap, map);
+        
+        // if Grid is CpGrid with LGRs, and it's a serial run
+        std::vector<Opm::data::Solution> outputTrans_levels{};     // TRANS* between cells from same level grid
+        std::vector<Opm::data::Solution> outputTransDiff_levels{}; // TRANS* between cells from different level grids
+        
+        if ( (this->eclState_.getLgrs().size()>0) && (this->grid_.maxLevel()>0) ) {
+            Opm::Lgr::extractTransLevelGrids(this->grid_,
+                                             this->globalTrans(),
+                                             outputTrans_levels,
+                                             outputTransDiff_levels,
+                                             directVerticalNeighbors);
+        }
     }
 
 #if HAVE_MPI