diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine.java
index 8fd31a9d..b42d14cd 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine.java
@@ -163,7 +163,7 @@ public abstract class GT_MetaTileEntity_LargeTurbine extends GT_MetaTileEntity_M
             this.mMaxProgresstime = 1;
             this.mEfficiencyIncrease = (10);
             if(this.mDynamoHatches.size()>0){
-            	if(this.mDynamoHatches.get(0).getBaseMetaTileEntity().getOutputVoltage() < (mEUt * mEfficiency) / 10000){
+            	if(this.mDynamoHatches.get(0).getBaseMetaTileEntity().getOutputVoltage() < (int)((long)mEUt * (long)mEfficiency / 10000L)){
             	explodeMultiblock();}
             }
             return true;
@@ -223,4 +223,4 @@ public abstract class GT_MetaTileEntity_LargeTurbine extends GT_MetaTileEntity_M
         return true;
     }
 
-}
\ No newline at end of file
+}
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Gas.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Gas.java
index c5507e0b..963a4efc 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Gas.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Gas.java
@@ -114,9 +114,9 @@ public class GT_MetaTileEntity_LargeTurbine_Gas extends GT_MetaTileEntity_LargeT
                 if (efficiency < 0)
                     efficiency = 0; // Can happen with really ludicrously poor inefficiency.
                 tEU *= efficiency;
-                tEU = Math.max(1, tEU * aBaseEff / 10000);
+                tEU = Math.max(1, (int)((long)tEU * (long)aBaseEff / 10000L));
             } else {
-                tEU = tEU * aBaseEff / 10000;
+                tEU = (int)((long)tEU * (long)aBaseEff / 10000L);
             }
 
             return tEU;
@@ -126,4 +126,4 @@ public class GT_MetaTileEntity_LargeTurbine_Gas extends GT_MetaTileEntity_LargeT
     }
 
 
-}
\ No newline at end of file
+}
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_HPSteam.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_HPSteam.java
index aa1f46af..8447b748 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_HPSteam.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_HPSteam.java
@@ -103,13 +103,13 @@ public class GT_MetaTileEntity_LargeTurbine_HPSteam extends GT_MetaTileEntity_La
             float efficiency = 1.0f - Math.abs(((totalFlow - (float) aOptFlow) / aOptFlow));
             if(totalFlow>aOptFlow){efficiency = 1.0f;}
             tEU *= efficiency;
-            tEU = Math.max(1, tEU * aBaseEff / 10000);
+            tEU = Math.max(1, (int)((long)tEU * (long)aBaseEff / 10000L));
         } else {
-            tEU = tEU * aBaseEff / 10000;
+            tEU = (int)((long)tEU * (long)aBaseEff / 10000L);
         }
 
         return tEU;
     }
 
 
-}
\ No newline at end of file
+}
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Plasma.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Plasma.java
index 923eaabc..6abe8105 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Plasma.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Plasma.java
@@ -130,9 +130,9 @@ public class GT_MetaTileEntity_LargeTurbine_Plasma extends GT_MetaTileEntity_Lar
                 if (efficiency < 0)
                     efficiency = 0; // Can happen with really ludicrously poor inefficiency.
                 tEU *= efficiency;
-                tEU = Math.max(1, tEU * aBaseEff / 10000);
+                tEU = Math.max(1, (int)((long)tEU * (long)aBaseEff / 10000L));
             } else {
-                tEU = tEU * aBaseEff / 10000;
+                tEU = (int)((long)tEU * (long)aBaseEff / 10000L);
             }
 
             return tEU;
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Steam.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Steam.java
index 1023235c..262d7bb7 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Steam.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Steam.java
@@ -111,11 +111,11 @@ public class GT_MetaTileEntity_LargeTurbine_Steam extends GT_MetaTileEntity_Larg
             float efficiency = 1.0f - Math.abs(((totalFlow - (float) aOptFlow) / aOptFlow));
             if(totalFlow>aOptFlow){efficiency = 1.0f;}
             tEU *= efficiency;
-            tEU = Math.max(1, tEU * aBaseEff / 20000);
+            tEU = Math.max(1, (int)((long)tEU * (long)aBaseEff / 20000L));
         } else {
-            tEU = tEU * aBaseEff / 20000;
+            tEU = (int)((long)tEU * (long)aBaseEff / 20000L);
         }
 
         return tEU;
     }
-}
\ No newline at end of file
+}