diff --git a/build.gradle b/build.gradle
index 13ee44b98f..6aa109db1e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -25,7 +25,7 @@ allprojects {
         appName = 'Mindustry'
         gdxVersion = '1.9.8'
         roboVMVersion = '2.3.0'
-        uCoreVersion = 'dec41336067c013f04f0e17db3b06e24d3c11f6a'
+        uCoreVersion = '7a77659cc5bb22c586d73cde6e21b854962e7f64'
 
         getVersionString = {
             String buildVersion = getBuildVersion()
diff --git a/core/src/io/anuke/mindustry/entities/units/types/Drone.java b/core/src/io/anuke/mindustry/entities/units/types/Drone.java
index 244f5ef455..1af4018725 100644
--- a/core/src/io/anuke/mindustry/entities/units/types/Drone.java
+++ b/core/src/io/anuke/mindustry/entities/units/types/Drone.java
@@ -79,12 +79,14 @@ public class Drone extends FlyingUnit implements BuilderTrait{
                 }
 
                 //if it's missing requirements, try and mine them
-                for(ItemStack stack : entity.recipe.requirements){
-                    if(!core.items.has(stack.item, stack.amount) && type.toMine.contains(stack.item)){
-                        targetItem = stack.item;
-                        getPlaceQueue().clear();
-                        setState(mine);
-                        return;
+                if(entity.recipe != null){
+                    for(ItemStack stack : entity.recipe.requirements){
+                        if(!core.items.has(stack.item, stack.amount) && type.toMine.contains(stack.item)){
+                            targetItem = stack.item;
+                            getPlaceQueue().clear();
+                            setState(mine);
+                            return;
+                        }
                     }
                 }
 
diff --git a/core/src/io/anuke/mindustry/ui/dialogs/UnlocksDialog.java b/core/src/io/anuke/mindustry/ui/dialogs/UnlocksDialog.java
index 1ba76a20ab..d8f39dc993 100644
--- a/core/src/io/anuke/mindustry/ui/dialogs/UnlocksDialog.java
+++ b/core/src/io/anuke/mindustry/ui/dialogs/UnlocksDialog.java
@@ -6,10 +6,10 @@ import io.anuke.mindustry.game.Content;
 import io.anuke.mindustry.game.UnlockableContent;
 import io.anuke.mindustry.graphics.Palette;
 import io.anuke.mindustry.type.ContentType;
+import io.anuke.mindustry.world.meta.StatValue;
 import io.anuke.ucore.scene.event.HandCursorListener;
 import io.anuke.ucore.scene.ui.Image;
 import io.anuke.ucore.scene.ui.ScrollPane;
-import io.anuke.ucore.scene.ui.Tooltip;
 import io.anuke.ucore.scene.ui.layout.Table;
 import io.anuke.ucore.scene.utils.UIUtils;
 
@@ -65,10 +65,7 @@ public class UnlocksDialog extends FloatingDialog{
 
                     if(control.unlocks.isUnlocked(unlock)){
                         image.clicked(() -> Vars.ui.content.show(unlock));
-                        image.addListener(new Tooltip<>(new Table("clear"){{
-                            add(unlock.localizedName());
-                            margin(4);
-                        }}));
+                        StatValue.addToolTip(image, unlock);
                     }
 
                     if((++count) % maxWidth == 0){
diff --git a/core/src/io/anuke/mindustry/world/blocks/power/PowerGraph.java b/core/src/io/anuke/mindustry/world/blocks/power/PowerGraph.java
index d02f701ab1..f9d4a8aba2 100644
--- a/core/src/io/anuke/mindustry/world/blocks/power/PowerGraph.java
+++ b/core/src/io/anuke/mindustry/world/blocks/power/PowerGraph.java
@@ -37,27 +37,62 @@ public class PowerGraph{
 
         lastFrameUpdated = threads.getFrameID();
 
+        boolean charge = false;
+        
         float totalInput = 0f;
+        float bufferInput = 0f;
         for(Tile producer : producers){
-            totalInput += producer.entity.power.amount;
+            if (producer.block().consumesPower) {
+                bufferInput += producer.entity.power.amount;
+            } else {
+                totalInput += producer.entity.power.amount;
+            }
         }
 
         float maxOutput = 0f;
+        float bufferOutput = 0f;
         for(Tile consumer : consumers){
-            maxOutput += consumer.block().powerCapacity - consumer.entity.power.amount;
+            if (consumer.block().outputsPower) {
+                bufferOutput += consumer.block().powerCapacity - consumer.entity.power.amount;
+            } else {
+                maxOutput += consumer.block().powerCapacity - consumer.entity.power.amount;
+            }
         }
 
-        if (totalInput <= 0.0001f || maxOutput <= 0.0001f) {
+        if (maxOutput < totalInput) {
+            charge = true;
+        }
+
+        if (totalInput + bufferInput <= 0.0001f || maxOutput + bufferOutput <= 0.0001f) {
             return;
         }
 
-        float inputUsed = Math.min(maxOutput / totalInput, 1f);
+        float bufferUsed = 0;
+        if (charge) {
+            bufferUsed = Math.min((totalInput - maxOutput) / bufferOutput, 1f);
+        } else {
+            bufferUsed = Math.min((maxOutput - totalInput) / bufferInput, 1f);
+        }
+
+        float inputUsed = charge ? Math.min((maxOutput + bufferOutput) / totalInput, 1f) : 1f;
         for(Tile producer : producers){
+            if (producer.block().consumesPower) {
+                if (!charge) {
+                    producer.entity.power.amount -= producer.entity.power.amount * bufferUsed;
+                }
+                continue;
+            }
             producer.entity.power.amount -= producer.entity.power.amount * inputUsed;
         }
 
-        float outputSatisfied = Math.min(totalInput / maxOutput, 1f);
+        float outputSatisfied = charge ? 1f : Math.min((totalInput + bufferInput) / maxOutput, 1f);
         for(Tile consumer : consumers){
+            if (consumer.block().outputsPower) {
+                if (charge) {
+                    consumer.entity.power.amount +=  (consumer.block().powerCapacity - consumer.entity.power.amount) * bufferUsed;
+                }
+                continue;
+            }
             consumer.entity.power.amount += (consumer.block().powerCapacity - consumer.entity.power.amount) * outputSatisfied;
         }
     }
diff --git a/core/src/io/anuke/mindustry/world/blocks/production/Cultivator.java b/core/src/io/anuke/mindustry/world/blocks/production/Cultivator.java
index 65eacb6ef7..e2854906dd 100644
--- a/core/src/io/anuke/mindustry/world/blocks/production/Cultivator.java
+++ b/core/src/io/anuke/mindustry/world/blocks/production/Cultivator.java
@@ -42,6 +42,7 @@ public class Cultivator extends Drill{
         stats.remove(BlockStat.drillTier);
         stats.add(BlockStat.drillTier, table -> {
             table.addImage("grass1").size(8 * 3).padBottom(3).padTop(3);
+            // TODO: find out localized name and add tool tip
         });
     }
 
diff --git a/core/src/io/anuke/mindustry/world/blocks/production/Drill.java b/core/src/io/anuke/mindustry/world/blocks/production/Drill.java
index 12a6635eb8..ac641ca4f7 100644
--- a/core/src/io/anuke/mindustry/world/blocks/production/Drill.java
+++ b/core/src/io/anuke/mindustry/world/blocks/production/Drill.java
@@ -16,11 +16,14 @@ import io.anuke.mindustry.world.consumers.ConsumeLiquid;
 import io.anuke.mindustry.world.meta.BlockGroup;
 import io.anuke.mindustry.world.meta.BlockStat;
 import io.anuke.mindustry.world.meta.StatUnit;
+import io.anuke.mindustry.world.meta.StatValue;
 import io.anuke.ucore.core.Effects;
 import io.anuke.ucore.core.Effects.Effect;
 import io.anuke.ucore.core.Graphics;
 import io.anuke.ucore.core.Timers;
 import io.anuke.ucore.graphics.Draw;
+import io.anuke.ucore.scene.ui.Image;
+import io.anuke.ucore.scene.ui.layout.Cell;
 import io.anuke.ucore.util.Mathf;
 import io.anuke.ucore.util.Threads;
 
@@ -133,7 +136,8 @@ public class Drill extends Block{
 
             for(int i = 0; i < list.size; i++){
                 Item item = list.get(i);
-                table.addImage(item.name + "1").size(8 * 3).padRight(2).padLeft(2).padTop(3).padBottom(3);
+                Cell<Image> imageCell = table.addImage(item.name + "1").size(8 * 3).padRight(2).padLeft(2).padTop(3).padBottom(3);
+                StatValue.addToolTip(imageCell.getElement(), item);
                 if(i != list.size - 1){
                     table.add("/");
                 }
diff --git a/core/src/io/anuke/mindustry/world/meta/StatValue.java b/core/src/io/anuke/mindustry/world/meta/StatValue.java
index 5b95ff6e4d..ef3e51acef 100644
--- a/core/src/io/anuke/mindustry/world/meta/StatValue.java
+++ b/core/src/io/anuke/mindustry/world/meta/StatValue.java
@@ -1,5 +1,10 @@
 package io.anuke.mindustry.world.meta;
 
+import io.anuke.mindustry.game.UnlockableContent;
+import io.anuke.ucore.scene.Element;
+import io.anuke.ucore.scene.ui.Image;
+import io.anuke.ucore.scene.ui.Tooltip;
+import io.anuke.ucore.scene.ui.layout.Cell;
 import io.anuke.ucore.scene.ui.layout.Table;
 
 /**
@@ -7,8 +12,38 @@ import io.anuke.ucore.scene.ui.layout.Table;
  */
 public interface StatValue{
     /**
-     * This method should all elements necessary to display this stat to the specified table.
+     * This method should provide all elements necessary to display this stat to the specified table.
      * For example, a stat that is just text would add label to the table.
      */
     void display(Table table);
+
+    /**
+     * This method adds an icon image together with a tool tip which contains the name of the item.
+     * @param table the table to add the image cell to.
+     * @param item The item which provides the tool tip content.
+     * @return the image cell which was created. The cell is not yet sized or padded.
+     */
+    static Cell<Image> addImageWithToolTip(Table table, UnlockableContent item){
+
+        // Create a table cell with a new image as provided by the item
+        Cell<Image> imageCell = table.addImage(item.getContentIcon());
+
+        // Retrieve the image and add a tool tip with the item's name
+        addToolTip(imageCell.getElement(), item);
+
+        // Return the table cell for further processing (sizing, padding, ...)
+        return imageCell;
+    }
+
+    /**
+     * Adds a tool tip containing the item's localized name to the given element.
+     * @param element The element to assign the tool tip to.
+     * @param item The item which provides the tool tip content.
+     */
+    static void addToolTip(Element element, UnlockableContent item){
+        element.addListener(new Tooltip<>(new Table("clear"){{
+            add(item.localizedName());
+            margin(4);
+        }}));
+    }
 }
diff --git a/core/src/io/anuke/mindustry/world/meta/values/ItemFilterValue.java b/core/src/io/anuke/mindustry/world/meta/values/ItemFilterValue.java
index 79348446ba..669f5baa2c 100644
--- a/core/src/io/anuke/mindustry/world/meta/values/ItemFilterValue.java
+++ b/core/src/io/anuke/mindustry/world/meta/values/ItemFilterValue.java
@@ -4,6 +4,8 @@ import com.badlogic.gdx.utils.Array;
 import io.anuke.mindustry.type.Item;
 import io.anuke.mindustry.world.meta.StatValue;
 import io.anuke.ucore.function.Predicate;
+import io.anuke.ucore.scene.ui.Image;
+import io.anuke.ucore.scene.ui.layout.Cell;
 import io.anuke.ucore.scene.ui.layout.Table;
 import static io.anuke.mindustry.Vars.*;
 
@@ -24,7 +26,12 @@ public class ItemFilterValue implements StatValue{
 
         for(int i = 0; i < list.size; i++){
             Item item = list.get(i);
-            table.addImage(item.region).size(8 * 3).padRight(2).padLeft(2);
+
+            Cell<Image> imageCell = table.addImage(item.region);
+            imageCell.size(8 * 3).padRight(2).padLeft(2);
+
+            StatValue.addToolTip(imageCell.getElement(), item);
+
             if(i != list.size - 1){
                 table.add("/");
             }
diff --git a/core/src/io/anuke/mindustry/world/meta/values/ItemListValue.java b/core/src/io/anuke/mindustry/world/meta/values/ItemListValue.java
index 9a236306a3..7cb237296f 100644
--- a/core/src/io/anuke/mindustry/world/meta/values/ItemListValue.java
+++ b/core/src/io/anuke/mindustry/world/meta/values/ItemListValue.java
@@ -5,6 +5,9 @@ import io.anuke.mindustry.type.Item;
 import io.anuke.mindustry.type.ItemStack;
 import io.anuke.mindustry.ui.ItemImage;
 import io.anuke.mindustry.world.meta.ContentStatValue;
+import io.anuke.mindustry.world.meta.StatValue;
+import io.anuke.ucore.scene.ui.Image;
+import io.anuke.ucore.scene.ui.layout.Cell;
 import io.anuke.ucore.scene.ui.layout.Table;
 
 public class ItemListValue implements ContentStatValue{
@@ -38,11 +41,17 @@ public class ItemListValue implements ContentStatValue{
     public void display(Table table){
         if(items != null){
             for(Item item : items){
-                table.addImage(item.region).size(8 * 3).padRight(5);
+                Cell<Image> imageCell = table.addImage(item.region);
+                imageCell.size(8 * 3).padRight(5);
+
+                StatValue.addToolTip(imageCell.getElement(), item);
             }
         }else{
             for(ItemStack stack : stacks){
-                table.add(new ItemImage(stack)).size(8 * 3).padRight(5);
+                ItemImage image = new ItemImage(stack);
+                table.add(image).size(8 * 3).padRight(5);
+
+                StatValue.addToolTip(image, stack.item);
             }
         }
     }
diff --git a/core/src/io/anuke/mindustry/world/meta/values/ItemValue.java b/core/src/io/anuke/mindustry/world/meta/values/ItemValue.java
index d42312c4d1..269c537dc5 100644
--- a/core/src/io/anuke/mindustry/world/meta/values/ItemValue.java
+++ b/core/src/io/anuke/mindustry/world/meta/values/ItemValue.java
@@ -5,6 +5,7 @@ import io.anuke.mindustry.type.Item;
 import io.anuke.mindustry.type.ItemStack;
 import io.anuke.mindustry.ui.ItemImage;
 import io.anuke.mindustry.world.meta.ContentStatValue;
+import io.anuke.mindustry.world.meta.StatValue;
 import io.anuke.ucore.scene.ui.layout.Table;
 
 public class ItemValue implements ContentStatValue{
@@ -22,6 +23,8 @@ public class ItemValue implements ContentStatValue{
     @Override
     public void display(Table table){
         //TODO better implementation, quantity support
-        table.add(new ItemImage(item)).size(8 * 3);
+        ItemImage image = new ItemImage(item);
+        table.add(image).size(8 * 3);
+        StatValue.addToolTip(image, item.item);
     }
 }
diff --git a/core/src/io/anuke/mindustry/world/meta/values/LiquidFilterValue.java b/core/src/io/anuke/mindustry/world/meta/values/LiquidFilterValue.java
index 9a3417581f..9dc6a6bd0b 100644
--- a/core/src/io/anuke/mindustry/world/meta/values/LiquidFilterValue.java
+++ b/core/src/io/anuke/mindustry/world/meta/values/LiquidFilterValue.java
@@ -4,6 +4,9 @@ import com.badlogic.gdx.utils.Array;
 import io.anuke.mindustry.type.Liquid;
 import io.anuke.mindustry.world.meta.StatValue;
 import io.anuke.ucore.function.Predicate;
+import io.anuke.ucore.scene.ui.Image;
+import io.anuke.ucore.scene.ui.Tooltip;
+import io.anuke.ucore.scene.ui.layout.Cell;
 import io.anuke.ucore.scene.ui.layout.Table;
 import static io.anuke.mindustry.Vars.*;
 
@@ -24,7 +27,10 @@ public class LiquidFilterValue implements StatValue{
 
         for(int i = 0; i < list.size; i++){
             Liquid item = list.get(i);
-            table.addImage(item.getContentIcon()).size(8 * 3).padRight(2).padLeft(2).padTop(2).padBottom(2);
+
+            Cell<Image> imageCell = StatValue.addImageWithToolTip(table, item);
+            imageCell.size(8 * 3).padRight(2).padLeft(2).padTop(2).padBottom(2);
+
             if(i != list.size - 1){
                 table.add("/");
             }
diff --git a/core/src/io/anuke/mindustry/world/meta/values/LiquidValue.java b/core/src/io/anuke/mindustry/world/meta/values/LiquidValue.java
index bdee87897e..d4d6734511 100644
--- a/core/src/io/anuke/mindustry/world/meta/values/LiquidValue.java
+++ b/core/src/io/anuke/mindustry/world/meta/values/LiquidValue.java
@@ -3,6 +3,9 @@ package io.anuke.mindustry.world.meta.values;
 import io.anuke.mindustry.game.UnlockableContent;
 import io.anuke.mindustry.type.Liquid;
 import io.anuke.mindustry.world.meta.ContentStatValue;
+import io.anuke.mindustry.world.meta.StatValue;
+import io.anuke.ucore.scene.ui.Image;
+import io.anuke.ucore.scene.ui.layout.Cell;
 import io.anuke.ucore.scene.ui.layout.Table;
 
 public class LiquidValue implements ContentStatValue{
@@ -19,6 +22,7 @@ public class LiquidValue implements ContentStatValue{
 
     @Override
     public void display(Table table){
-        table.addImage(liquid.getContentIcon()).size(8 * 3);
+        Cell<Image> imageCell = StatValue.addImageWithToolTip(table, liquid);
+        imageCell.size(8 * 3);
     }
 }
diff --git a/server/src/io/anuke/mindustry/server/ServerControl.java b/server/src/io/anuke/mindustry/server/ServerControl.java
index 1688653ecd..9ecc29d0d3 100644
--- a/server/src/io/anuke/mindustry/server/ServerControl.java
+++ b/server/src/io/anuke/mindustry/server/ServerControl.java
@@ -1,6 +1,7 @@
 package io.anuke.mindustry.server;
 
 import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.files.FileHandle;
 import com.badlogic.gdx.utils.Array;
 import com.badlogic.gdx.utils.ObjectSet;
 import com.badlogic.gdx.utils.Timer;
@@ -41,12 +42,18 @@ import static io.anuke.ucore.util.Log.*;
 
 public class ServerControl extends Module{
     private static final int roundExtraTime = 12;
+    //in bytes: 512 kb is max
+    private static final int maxLogLength = 1024 * 512;
 
     private final CommandHandler handler = new CommandHandler("");
+    private final FileHandle logFolder = Gdx.files.local("logs/");
+
+    private FileHandle currentLogFile;
     private int gameOvers;
     private boolean inExtraRound;
     private Task lastTask;
 
+
     public ServerControl(String[] args){
         Settings.defaultList(
             "shufflemode", "normal",
@@ -56,7 +63,8 @@ public class ServerControl extends Module{
             "sector_y", 1,
             "shuffle", true,
             "crashreport", false,
-            "port", port
+            "port", port,
+            "logging", true
         );
 
         Log.setLogger(new LogHandler(){
@@ -64,22 +72,27 @@ public class ServerControl extends Module{
 
             @Override
             public void info(String text, Object... args){
-                print("&lg&fb" + "[INFO] " + format(text, args));
+                print("&lg&fb" + "[INFO] " + text, args);
             }
 
             @Override
             public void err(String text, Object... args){
-                print("&lr&fb" + "[ERR!] " + format(text, args));
+                print("&lr&fb" + "[ERR!] " + text, args);
             }
 
             @Override
             public void warn(String text, Object... args){
-                print("&ly&fb" + "[WARN] " + format(text, args));
+                print("&ly&fb" + "[WARN] " + text, args);
             }
 
             @Override
             public void print(String text, Object... args){
-                System.out.println("[" + dateTime.format(LocalDateTime.now()) + "] " + format(text + "&fr", args));
+                String result = "[" + dateTime.format(LocalDateTime.now()) + "] " + format(text + "&fr", args);
+                System.out.println(result);
+
+                if(Settings.getBool("logging")){
+                    logToFile("[" + dateTime.format(LocalDateTime.now()) + "] " + format(text + "&fr", false, args));
+                }
             }
         });
 
@@ -311,7 +324,7 @@ public class ServerControl extends Module{
                 return;
             }
 
-            Call.sendMessage("[GRAY][[Server]:[] " + arg[0]);
+            Call.sendMessage("[scarlet][[Server]:[] " + arg[0]);
 
             info("&lyServer: &lb{0}", arg[0]);
         });
@@ -357,6 +370,13 @@ public class ServerControl extends Module{
             info("Crash reporting is now {0}.", value ? "on" : "off");
         });
 
+        handler.register("logging", "<on/off>", "Disables or enables server logs", arg -> {
+            boolean value = arg[0].equalsIgnoreCase("on");
+            Settings.putBool("logging", value);
+            Settings.save();
+            info("Logging is now {0}.", value ? "on" : "off");
+        });
+
         handler.register("strict", "<on/off>", "Disables or enables strict mode", arg -> {
            boolean value = arg[0].equalsIgnoreCase("on");
            netServer.admins.setStrict(value);
@@ -400,6 +420,7 @@ public class ServerControl extends Module{
             Player target = playerGroup.find(p -> p.name.equals(arg[0]));
 
             if(target != null){
+                Call.sendMessage("[scarlet] " + target.name + " has been kicked by the server.");
                 netServer.kick(target.con.id, KickReason.kick);
                 info("It is done.");
             }else{
@@ -425,6 +446,13 @@ public class ServerControl extends Module{
             }else{
                 err("Invalid type.");
             }
+
+            for(Player player : playerGroup.all()){
+                if(netServer.admins.isIDBanned(player.uuid)){
+                    Call.sendMessage("[scarlet] " + player.name + " has been banned.");
+                    netServer.kick(player.con.id, KickReason.banned);
+                }
+            }
         });
 
         handler.register("bans", "List all banned IPs and IDs.", arg -> {
@@ -724,4 +752,23 @@ public class ServerControl extends Module{
             state.set(State.menu);
         }
     }
+
+    private void logToFile(String text){
+        if(currentLogFile != null && currentLogFile.length() > maxLogLength){
+            String date = DateTimeFormatter.ofPattern("MM-dd-yyyy | HH:mm:ss").format(LocalDateTime.now());
+            currentLogFile.writeString("[End of log file. Date: "+ date + "]\n", true);
+            currentLogFile = null;
+        }
+
+        if(currentLogFile == null){
+            int i = 0;
+            while(logFolder.child("log-" + i + ".txt").length() >= maxLogLength){
+                i ++;
+            }
+
+            currentLogFile = logFolder.child("log-" + i + ".txt");
+        }
+
+        currentLogFile.writeString(text + "\n", true);
+    }
 }