filterable power node connections

core/src/mindustry/world/Block.java

@@ -670,6 +670,10 @@ public class Block extends UnlockableContent{
         return isVisible() && (!state.rules.bannedBlocks.contains(this) || state.rules.editor) && supportsEnv(state.rules.environment);
     }
 
+    public boolean shouldConnect(Building build){
+        return true;
+    }
+
     /** @return whether this block supports a specific environment. */
     public boolean supportsEnv(int env){
         return (envEnabled & env) != 0 && (envDisabled & env) == 0 && (envRequired == 0 || (envRequired & env) == envRequired);

core/src/mindustry/world/blocks/power/PowerNode.java

@@ -205,6 +205,7 @@ public class PowerNode extends PowerBlock{
             overlaps(tile.x * tilesize + offset, tile.y * tilesize + offset, other.tile(), laserRange * tilesize) && other.team == team &&
             !graphs.contains(other.power.graph) &&
             !PowerNode.insulated(tile, other.tile) &&
+            other.block.shouldConnect(other) &&
             !(other instanceof PowerNodeBuild obuild && obuild.power.links.size >= ((PowerNode)obuild.block).maxNodes) &&
             !Structs.contains(Edges.getEdges(size), p -> { //do not link to adjacent buildings
                 var t = world.tile(tile.x + p.x, tile.y + p.y);