diff --git a/platformio.ini b/platformio.ini
index d0a3537..beee78b 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -13,6 +13,7 @@ platform = espressif32
 board = esp32dev
 framework = arduino
 lib_deps = https://github.com/adafruit/Adafruit_NeoPixel
+           https://github.com/knolleary/pubsubclient
 build_flags =
 upload_port = 10.0.0.116
 upload_protocol = espota
diff --git a/src/display/Color.cpp b/src/display/Color.cpp
index 6176f7d..3be724d 100644
--- a/src/display/Color.cpp
+++ b/src/display/Color.cpp
@@ -8,6 +8,8 @@ const Color RED = {FULL, ____, ____};
 
 const Color GREEN = {____, FULL, ____};
 
+const Color ORANGE = {FULL, HALF, ____};
+
 const Color BLUE = {____, ____, FULL};
 
 const Color YELLOW = {FULL, FULL, ____};
diff --git a/src/display/Color.h b/src/display/Color.h
index a44b4f8..280fe8b 100644
--- a/src/display/Color.h
+++ b/src/display/Color.h
@@ -21,6 +21,8 @@ extern const Color RED;
 
 extern const Color GREEN;
 
+extern const Color ORANGE;
+
 extern const Color BLUE;
 
 extern const Color YELLOW;
diff --git a/src/display/Display.h b/src/display/Display.h
index f1c2ba5..2b4cb1f 100644
--- a/src/display/Display.h
+++ b/src/display/Display.h
@@ -6,6 +6,7 @@
 #include "Vector.h"
 
 #define SYMBOL_COUNT          15
+#define SYMBOL_DASH           13
 #define DISPLAY_CHAR_WIDTH    3
 #define DISPLAY_CHAR_HEIGHT   5
 
@@ -89,7 +90,10 @@ public:
       memset(buffer, 0, pixelByteCount);
     }
 
-    uint8_t print(uint8_t xPos, uint8_t yPos, uint8_t index, Color color) {
+    uint8_t print(uint8_t xPos, uint8_t yPos, uint8_t index, Color color, bool showIfZero) {
+      if (index == 0 && !showIfZero) {
+        return DISPLAY_CHAR_WIDTH;
+      }
       if (index >= SYMBOL_COUNT) {
         Serial.printf("Cannot print symbol #%u.\n", index);
         index = SYMBOL_COUNT - 1;
diff --git a/src/main.cpp b/src/main.cpp
index 2d03460..6ae0c79 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -6,6 +6,7 @@
 
 #include "mode.h"
 #include "display.h"
+#include "mqtt.h"
 
 void setup() {
   delay(500);
@@ -23,6 +24,7 @@ void setup() {
 void loop() {
   serial_loop();
   wifi_loop();
+  mqtt_loop();
   server_loop();
   mode_loop();
   config_loop();
diff --git a/src/mode.cpp b/src/mode.cpp
index 3b044ec..88e4a3c 100644
--- a/src/mode.cpp
+++ b/src/mode.cpp
@@ -9,6 +9,7 @@
 #include "mode/Starfield/Starfield.h"
 #include "mode/Matrix/Matrix.h"
 #include "display.h"
+#include "mode/Electricity/Electricity.h"
 
 ModeId currentModeId = NONE;
 
@@ -108,6 +109,9 @@ void loadNewMode() {
     case MATRIX:
       mode = new Matrix(display);
       break;
+    case ELECTRICITY:
+      mode = new Electricity(display);
+      break;
     default:
       Serial.print("No mode loaded.\n");
       display.clear();
diff --git a/src/mode/Clock/Clock.h b/src/mode/Clock/Clock.h
index 30b1587..ac9c18c 100644
--- a/src/mode/Clock/Clock.h
+++ b/src/mode/Clock/Clock.h
@@ -28,17 +28,17 @@ protected:
       display.clear();
 
       uint8_t x = 2;
-      x += display.print(x, 1, realtimeOK ? now.tm_hour / 10 : 13, WHITE);
+      x += display.print(x, 1, realtimeOK ? now.tm_hour / 10 : SYMBOL_DASH, WHITE, true);
       x++;
-      x += display.print(x, 1, realtimeOK ? now.tm_hour % 10 : 13, WHITE);
-      x += display.print(x, 1, 10, WHITE);
-      x += display.print(x, 1, realtimeOK ? now.tm_min / 10 : 13, WHITE);
+      x += display.print(x, 1, realtimeOK ? now.tm_hour % 10 : SYMBOL_DASH, WHITE, true);
+      x += display.print(x, 1, 10, WHITE, true);
+      x += display.print(x, 1, realtimeOK ? now.tm_min / 10 : SYMBOL_DASH, WHITE, true);
       x++;
-      x += display.print(x, 1, realtimeOK ? now.tm_min % 10 : 13, WHITE);
-      x += display.print(x, 1, 10, WHITE);
-      x += display.print(x, 1, realtimeOK ? now.tm_sec / 10 : 13, WHITE);
+      x += display.print(x, 1, realtimeOK ? now.tm_min % 10 : SYMBOL_DASH, WHITE, true);
+      x += display.print(x, 1, 10, WHITE, true);
+      x += display.print(x, 1, realtimeOK ? now.tm_sec / 10 : SYMBOL_DASH, WHITE, true);
       x++;
-      x += display.print(x, 1, realtimeOK ? now.tm_sec % 10 : 13, WHITE);
+      x += display.print(x, 1, realtimeOK ? now.tm_sec % 10 : SYMBOL_DASH, WHITE, true);
     }
 
 };
diff --git a/src/mode/CountDown/CountDown.h b/src/mode/CountDown/CountDown.h
index 6f66e05..329b234 100644
--- a/src/mode/CountDown/CountDown.h
+++ b/src/mode/CountDown/CountDown.h
@@ -151,15 +151,15 @@ private:
       uint8_t x = 0;
       if (days > 0) {
         drawDay(display, days, &x);
-        x += display.print(x, 1, 10, WHITE);
+        x += display.print(x, 1, 10, WHITE, true);
       } else {
         x += 2;
       }
       drawHour(display, days, hours, &x);
-      x += display.print(x, 1, 10, WHITE);
+      x += display.print(x, 1, 10, WHITE, true);
       draw2Digit(display, minutes, &x);
       if (days <= 0) {
-        x += display.print(x, 1, 10, WHITE);
+        x += display.print(x, 1, 10, WHITE, true);
         draw2Digit(display, seconds, &x);
         drawSubSecondsBar(display);
       } else {
@@ -169,51 +169,51 @@ private:
 
     static void drawNoTime(Display &display) {
       uint8_t x = 2;
-      x += display.print(x, 1, 13, WHITE);
+      x += display.print(x, 1, SYMBOL_DASH, WHITE, true);
       x++;
-      x += display.print(x, 1, 13, WHITE);
-      x += display.print(x, 1, 10, WHITE);
-      x += display.print(x, 1, 13, WHITE);
+      x += display.print(x, 1, SYMBOL_DASH, WHITE, true);
+      x += display.print(x, 1, 10, WHITE, true);
+      x += display.print(x, 1, SYMBOL_DASH, WHITE, true);
       x++;
-      x += display.print(x, 1, 13, WHITE);
-      x += display.print(x, 1, 10, WHITE);
-      x += display.print(x, 1, 13, WHITE);
+      x += display.print(x, 1, SYMBOL_DASH, WHITE, true);
+      x += display.print(x, 1, 10, WHITE, true);
+      x += display.print(x, 1, SYMBOL_DASH, WHITE, true);
       x++;
-      x += display.print(x, 1, 13, WHITE);
+      x += display.print(x, 1, SYMBOL_DASH, WHITE, true);
     }
 
     static void drawDay(Display &display, int days, uint8_t *x) {
       if (days >= 100) {
-        *x += display.print(*x, 1, days / 100, WHITE);
+        *x += display.print(*x, 1, days / 100, WHITE, true);
       } else {
         *x += 3;
       }
       (*x)++;
 
       if (days >= 10) {
-        *x += display.print(*x, 1, days / 10 % 10, WHITE);
+        *x += display.print(*x, 1, days / 10 % 10, WHITE, true);
       } else {
         *x += 3;
       }
       (*x)++;
 
-      *x += display.print(*x, 1, days % 10, WHITE);
+      *x += display.print(*x, 1, days % 10, WHITE, true);
     }
 
     static void drawHour(Display &display, int days, int hours, uint8_t *x) {
       if (days > 0 || hours >= 10) {
-        *x += display.print(*x, 1, hours / 10, WHITE);
+        *x += display.print(*x, 1, hours / 10, WHITE, true);
       } else {
         *x += 3;
       }
       (*x)++;
-      *x += display.print(*x, 1, hours % 10, WHITE);
+      *x += display.print(*x, 1, hours % 10, WHITE, true);
     }
 
     static void draw2Digit(Display &display, int value, uint8_t *x) {
-      *x += display.print(*x, 1, value / 10, WHITE);
+      *x += display.print(*x, 1, value / 10, WHITE, true);
       (*x)++;
-      *x += display.print(*x, 1, value % 10, WHITE);
+      *x += display.print(*x, 1, value % 10, WHITE, true);
     }
 
     static void drawSecondsBar(Display &display, int seconds) {
@@ -244,13 +244,13 @@ private:
 
     static void drawYear(Display &display, int year) {
       uint8_t x = 8;
-      x += display.print(x, 1, year / 1000 % 10, WHITE);
+      x += display.print(x, 1, year / 1000 % 10, WHITE, true);
       x++;
-      x += display.print(x, 1, year / 100 % 10, WHITE);
+      x += display.print(x, 1, year / 100 % 10, WHITE, true);
       x++;
-      x += display.print(x, 1, year / 10 % 10, WHITE);
+      x += display.print(x, 1, year / 10 % 10, WHITE, true);
       x++;
-      x += display.print(x, 1, year / 1 % 10, WHITE);
+      x += display.print(x, 1, year / 1 % 10, WHITE, true);
     }
 
 };
diff --git a/src/mode/Electricity/Electricity.h b/src/mode/Electricity/Electricity.h
new file mode 100644
index 0000000..254f369
--- /dev/null
+++ b/src/mode/Electricity/Electricity.h
@@ -0,0 +1,67 @@
+#ifndef MODE_ELECTRICITY_H
+#define MODE_ELECTRICITY_H
+
+#include "mode/Mode.h"
+#include "mqtt.h"
+
+#pragma clang diagnostic push
+#pragma ide diagnostic ignored "UnusedValue"
+
+class Electricity : public Mode {
+
+public:
+
+    explicit Electricity(Display &display) :
+        Mode(display) {
+      // nothing
+    }
+
+    const char *getName() override {
+      return "Electricity";
+    }
+
+protected:
+
+    void step(microseconds_t microseconds) override {
+      if (realtimeChanged) {
+        markDirty();
+      }
+    }
+
+    void draw(Display &display) override {
+      display.clear();
+      uint8_t x = 0;
+
+      int pv = (int) round(getPhotovoltaicPowerW());
+      int pv100 = (pv / 100) % 10;
+      int pv10 = (pv / 10) % 10;
+      int pv1 = pv % 10;
+      Serial.printf("pv100=%d, pv10=%d, pv1=%d, pv=%f\n", pv100, pv10, pv1, getPhotovoltaicPowerW());
+      x += display.print(x, 1, isnan(pv) ? SYMBOL_DASH : pv100, GREEN, pv >= 100) + 1;
+      x += display.print(x, 1, isnan(pv) ? SYMBOL_DASH : pv10, GREEN, pv >= 10) + 1;
+      x += display.print(x, 1, isnan(pv) ? SYMBOL_DASH : pv1, GREEN, true) + 1;
+
+      x += 5;
+
+      int grid = (int) round(getGridPowerW());
+      Color color = ORANGE;
+      if (grid < 0) {
+        color = MAGENTA;
+        grid = -grid;
+      }
+      int grid1000 = (grid / 1000) % 10;
+      int grid100 = (grid / 100) % 10;
+      int grid10 = (grid / 10) % 10;
+      int grid1 = grid % 10;
+      Serial.printf("grid100=%d, grid10=%d, grid1=%d, grid=%f\n", grid100, grid10, grid1, getGridPowerW());
+      x += display.print(x, 1, isnan(grid) ? SYMBOL_DASH : grid1000, color, grid >= 1000) + 1;
+      x += display.print(x, 1, isnan(grid) ? SYMBOL_DASH : grid100, color, grid >= 100) + 1;
+      x += display.print(x, 1, isnan(grid) ? SYMBOL_DASH : grid10, color, grid >= 10) + 1;
+      x += display.print(x, 1, isnan(grid) ? SYMBOL_DASH : grid1, color, true) + 1;
+    }
+
+};
+
+#pragma clang diagnostic pop
+
+#endif
diff --git a/src/mode/Mode.h b/src/mode/Mode.h
index afa3049..c74ffe4 100644
--- a/src/mode/Mode.h
+++ b/src/mode/Mode.h
@@ -23,6 +23,7 @@ enum ModeId {
     COUNT_DOWN_BARS,
     STARFIELD,
     MATRIX,
+    ELECTRICITY,
 };
 
 class Mode {
diff --git a/src/mode/Pong/Pong.h b/src/mode/Pong/Pong.h
index 3b30ff9..cae5325 100644
--- a/src/mode/Pong/Pong.h
+++ b/src/mode/Pong/Pong.h
@@ -97,8 +97,8 @@ protected:
       display.clear();
       switch (status) {
         case SCORE:
-          display.print(1, 1, player0.score, GREEN);
-          display.print(width - 1 - DISPLAY_CHAR_WIDTH, 1, player1.score, RED);
+          display.print(1, 1, player0.score, GREEN, true);
+          display.print(width - 1 - DISPLAY_CHAR_WIDTH, 1, player1.score, RED, true);
           break;
         case PLAY:
           for (int i = 0; i < player0.size; ++i) {
@@ -111,11 +111,11 @@ protected:
           break;
         case OVER:
           if (player0.score > player1.score) {
-            display.print(1, 1, 11, GREEN);
-            display.print(width - 1 - DISPLAY_CHAR_WIDTH, 1, 12, RED);
+            display.print(1, 1, 11, GREEN, true);
+            display.print(width - 1 - DISPLAY_CHAR_WIDTH, 1, 12, RED, true);
           } else if (player0.score < player1.score) {
-            display.print(1, 1, 12, RED);
-            display.print(width - 1 - DISPLAY_CHAR_WIDTH, 1, 11, GREEN);
+            display.print(1, 1, 12, RED, true);
+            display.print(width - 1 - DISPLAY_CHAR_WIDTH, 1, 11, GREEN, true);
           }
           break;
       }
diff --git a/src/mqtt.cpp b/src/mqtt.cpp
new file mode 100644
index 0000000..2c2c085
--- /dev/null
+++ b/src/mqtt.cpp
@@ -0,0 +1,94 @@
+#include <WiFiClient.h>
+#include <WiFi.h>
+#include "mqtt.h"
+#include "PubSubClient.h"
+#include "wifi.h"
+
+#define MQTT_CONNECT_TIMEOUT_MILLISECONDS   5000
+
+#define MQTT_MAX_MESSAGE_AGE_MILLIS         5000
+
+#define PHOTOVOLTAIC_POWER                  "openDTU/pv/ac/power"
+
+#define GRID_POWER                          "electricity/grid/power/signed/w"
+
+WiFiClient espClient;
+
+PubSubClient mqtt(espClient);
+
+bool mqttConnected = false;
+
+unsigned long mqttLastConnectTry = 0;
+
+double photovoltaicPowerW = NAN;
+
+unsigned long photovoltaicPowerWLast = 0;
+
+double gridPowerW = NAN;
+
+unsigned long gridPowerWLast = 0;
+
+void mqttDisconnect();
+
+void mqttCallback(char *topic, uint8_t *payload, unsigned int length) {
+  char message[128];
+  if (length > sizeof message - 1) {
+    Serial.printf("MQTT: received too long message: topic=%s, length=%d", topic, length);
+    return;
+  }
+  memcpy(message, payload, length);
+  message[length] = 0;
+  if (strcmp(PHOTOVOLTAIC_POWER, topic) == 0) {
+    photovoltaicPowerW = strtod(message, nullptr);
+    photovoltaicPowerWLast = millis();
+  } else if (strcmp(GRID_POWER, topic) == 0) {
+    gridPowerW = strtod(message, nullptr);
+    gridPowerWLast = millis();
+  }
+}
+
+void mqtt_loop() {
+  if (!wifiIsConnected()) {
+    mqttDisconnect();
+    return;
+  }
+  if (!mqtt.loop() && (mqttLastConnectTry == 0 || millis() - mqttLastConnectTry > MQTT_CONNECT_TIMEOUT_MILLISECONDS)) {
+    mqttLastConnectTry = millis();
+    mqtt.setServer("10.0.0.50", 1883);
+    mqttConnected = mqtt.connect(WiFiClass::getHostname());
+    if (mqttConnected) {
+      Serial.printf("Successfully connected mqtt broker at %s:%d\n", "10.0.0.50", 1883);
+      mqtt.setCallback(mqttCallback);
+      mqtt.subscribe(PHOTOVOLTAIC_POWER);
+      mqtt.subscribe(GRID_POWER);
+    } else {
+      Serial.printf("ERROR: Failed to connect MQTT broker at %s:%d\n", "10.0.0.50", 1883);
+      mqttDisconnect();
+    }
+  }
+}
+
+void mqttDisconnect() {
+  if (mqttConnected) {
+    mqtt.disconnect();
+    mqttConnected = false;
+    photovoltaicPowerW = NAN;
+    photovoltaicPowerWLast = 0;
+    gridPowerW = NAN;
+    gridPowerWLast = 0;
+  }
+}
+
+double getPhotovoltaicPowerW() {
+  if (millis() - photovoltaicPowerWLast > MQTT_MAX_MESSAGE_AGE_MILLIS) {
+    return NAN;
+  }
+  return photovoltaicPowerW;
+}
+
+double getGridPowerW() {
+  if (millis() - gridPowerWLast > MQTT_MAX_MESSAGE_AGE_MILLIS) {
+    return NAN;
+  }
+  return gridPowerW;
+}
diff --git a/src/mqtt.h b/src/mqtt.h
new file mode 100644
index 0000000..485d326
--- /dev/null
+++ b/src/mqtt.h
@@ -0,0 +1,10 @@
+#ifndef SENSOR2_MQTT_H
+#define SENSOR2_MQTT_H
+
+void mqtt_loop();
+
+double getPhotovoltaicPowerW();
+
+double getGridPowerW();
+
+#endif
diff --git a/src/server.cpp b/src/server.cpp
index 3f01407..74875fc 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -105,6 +105,7 @@ void web_index() {
   server.sendContent(R"(<a onclick="get('/mode?mode=10');">COUNT_DOWN_BARS</a><br>)");
   server.sendContent(R"(<a onclick="get('/mode?mode=11');">STARFIELD</a><br>)");
   server.sendContent(R"(<a onclick="get('/mode?mode=12');">MATRIX</a><br>)");
+  server.sendContent(R"(<a onclick="get('/mode?mode=13');">ELECTRICITY</a><br>)");
   server.sendContent(R"(</p>)");
 
   server.sendContent(R"(<p>)");
diff --git a/src/wifi.cpp b/src/wifi.cpp
index 6f7708a..bb3fff1 100644
--- a/src/wifi.cpp
+++ b/src/wifi.cpp
@@ -1,13 +1,14 @@
 #include "wifi.h"
 #include "display.h"
+#include "mqtt.h"
 
 #include <WiFi.h>
 #include <ArduinoOTA.h>
 #include <esp_sntp.h>
 
-bool connected = false;
+bool wifiConnected = false;
 
-void ntp_setup();
+void onConnect();
 
 uint32_t ip2int(const IPAddress &ip);
 
@@ -16,6 +17,7 @@ void timeSyncCallback(struct timeval *tv);
 char *calculateGateway(char *calculatedGateway, size_t size);
 
 void wifi_setup() {
+  WiFiClass::setHostname("RGBMatrixDisplay");
   WiFi.begin("HappyNet", "1Grausame!Sackratte7");
   yield();
 
@@ -50,21 +52,21 @@ void wifi_setup() {
 void wifi_loop() {
   ArduinoOTA.handle();
   bool hasIp = (uint32_t) WiFi.localIP() != 0;
-  if (!connected) {
+  if (!wifiConnected) {
     if (hasIp) {
-      connected = true;
-      Serial.printf("WiFi connected: %s\n", WiFi.localIP().toString().c_str());
-      ntp_setup();
+      wifiConnected = true;
+      onConnect();
     }
   } else {
     if (!hasIp) {
-      connected = false;
+      wifiConnected = false;
       Serial.println("WiFi disconnected!");
     }
   }
 }
 
-void ntp_setup() {
+void onConnect() {
+  Serial.printf("WiFi connected: %s\n", WiFi.localIP().toString().c_str());
   char calculatedGateway[16] = {0};
   calculateGateway(calculatedGateway, sizeof(calculatedGateway));
   sntp_set_time_sync_notification_cb(timeSyncCallback);
@@ -73,6 +75,10 @@ void ntp_setup() {
   yield();
 }
 
+bool wifiIsConnected() {
+  return wifiConnected;
+}
+
 char *calculateGateway(char *calculatedGateway, size_t size) {
   uint32_t local = ip2int(WiFi.localIP());
   uint32_t netmask = ip2int(WiFi.subnetMask());
diff --git a/src/wifi.h b/src/wifi.h
index 91fa910..c2bf457 100644
--- a/src/wifi.h
+++ b/src/wifi.h
@@ -5,4 +5,6 @@ void wifi_setup();
 
 void wifi_loop();
 
+bool wifiIsConnected();
+
 #endif