Prevent IC2 double-outputting.

src/api/java/ic2/api/energy/tile/IEnergyConductor.java

@@ -0,0 +1,53 @@
+package ic2.api.energy.tile;
+
+/**
+ * Tile entities which conduct energy pulses without buffering (mostly cables) have to implement this
+ * interface.
+ * 
+ * See ic2/api/energy/usage.txt for an overall description of the energy net api.
+ */
+public interface IEnergyConductor extends IEnergyAcceptor, IEnergyEmitter {
+	/**
+	 * Energy loss for the conductor in EU per block.
+	 * 
+	 * @return Energy loss
+	 */
+	double getConductionLoss();
+
+	/**
+	 * Amount of energy the insulation will handle before shocking nearby players and mobs.
+	 * 
+	 * @return Insulation energy absorption in EU
+	 */
+	double getInsulationEnergyAbsorption();
+
+	/**
+	 * Amount of energy the insulation will handle before it is destroyed.
+	 * Ensure that this value is greater than the insulation energy absorption + 64.
+	 *
+	 * @return Insulation-destroying energy in EU
+	 */
+	double getInsulationBreakdownEnergy();
+
+	/**
+	 * Amount of energy the conductor will handle before it melts.
+	 * 
+	 * @return Conductor-destroying energy in EU
+	 */
+	double getConductorBreakdownEnergy();
+
+	/**
+	 * Remove the conductor's insulation if the insulation breakdown energy was exceeded.
+	 * 
+	 * @see #getInsulationBreakdownEnergy()
+	 */
+	void removeInsulation();
+
+	/**
+	 * Remove the conductor if the conductor breakdown energy was exceeded.
+	 * 
+	 * @see #getConductorBreakdownEnergy()
+	 */
+	void removeConductor();
+}
+

src/main/java/mekanism/common/tile/TileEntityElectricBlock.java

@@ -3,6 +3,7 @@ package mekanism.common.tile;
 import ic2.api.energy.EnergyNet;
 import ic2.api.energy.event.EnergyTileLoadEvent;
 import ic2.api.energy.event.EnergyTileUnloadEvent;
+import ic2.api.energy.tile.IEnergyConductor;
 import ic2.api.energy.tile.IEnergySink;
 import ic2.api.energy.tile.IEnergySource;
 import ic2.api.energy.tile.IEnergyTile;
@@ -375,7 +376,7 @@ public abstract class TileEntityElectricBlock extends TileEntityContainerBlock i
 	@Method(modid = "IC2")
 	public boolean emitsEnergyTo(TileEntity receiver, ForgeDirection direction)
 	{
-		return getOutputtingSides().contains(direction);
+		return getOutputtingSides().contains(direction) && receiver instanceof IEnergyConductor;
 	}
 
 	@Override