diff --git a/central_backend/Cargo.lock b/central_backend/Cargo.lock
index 692306b..83a692a 100644
--- a/central_backend/Cargo.lock
+++ b/central_backend/Cargo.lock
@@ -626,6 +626,7 @@ dependencies = [
  "mime_guess",
  "openssl",
  "openssl-sys",
+ "prettytable-rs",
  "rand",
  "reqwest",
  "rust-embed",
@@ -798,6 +799,27 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "csv"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac574ff4d437a7b5ad237ef331c17ccca63c46479e5b5453eb8e10bb99a759fe"
+dependencies = [
+ "csv-core",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "csv-core"
+version = "0.1.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5efa2b3d7902f4b634a20cae3c9c4e6209dc4779feb6863329607560143efa70"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "ctr"
 version = "0.9.2"
@@ -840,6 +862,33 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "dirs-next"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b98cf8ebf19c3d1b223e151f99a4f9f0690dca41414773390fc824184ac833e1"
+dependencies = [
+ "cfg-if",
+ "dirs-sys-next",
+]
+
+[[package]]
+name = "dirs-sys-next"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ebda144c4fe02d1f7ea1a7d9641b6fc6b580adcfa024ae48797ecdeb6825b4d"
+dependencies = [
+ "libc",
+ "redox_users",
+ "winapi",
+]
+
+[[package]]
+name = "encode_unicode"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34aa73646ffb006b8f5147f3dc182bd4bcb190227ce861fc4a4844bf8e3cb2c0"
+
 [[package]]
 name = "encoding_rs"
 version = "0.8.34"
@@ -1118,6 +1167,12 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
 
+[[package]]
+name = "hermit-abi"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fbf6a919d6cf397374f7dfeeea91d974c7c0a7221d0d0f4f20d859d329e53fcc"
+
 [[package]]
 name = "hkdf"
 version = "0.12.4"
@@ -1336,6 +1391,17 @@ version = "2.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f518f335dce6725a761382244631d86cf0ccb2863413590b31338feb467f9c3"
 
+[[package]]
+name = "is-terminal"
+version = "0.4.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "261f68e344040fbd0edea105bef17c66edf46f984ddb1115b775ce31be948f4b"
+dependencies = [
+ "hermit-abi 0.4.0",
+ "libc",
+ "windows-sys 0.52.0",
+]
+
 [[package]]
 name = "is_terminal_polyfill"
 version = "1.70.1"
@@ -1422,6 +1488,16 @@ version = "0.2.155"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c"
 
+[[package]]
+name = "libredox"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0ff37bd590ca25063e35af745c343cb7a0271906fb7b37e4813e8f79f00268d"
+dependencies = [
+ "bitflags 2.6.0",
+ "libc",
+]
+
 [[package]]
 name = "linux-raw-sys"
 version = "0.4.14"
@@ -1498,7 +1574,7 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4569e456d394deccd22ce1c1913e6ea0e54519f577285001215d33557431afe4"
 dependencies = [
- "hermit-abi",
+ "hermit-abi 0.3.9",
  "libc",
  "log",
  "wasi",
@@ -1731,6 +1807,20 @@ dependencies = [
  "zerocopy",
 ]
 
+[[package]]
+name = "prettytable-rs"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eea25e07510aa6ab6547308ebe3c036016d162b8da920dbb079e3ba8acf3d95a"
+dependencies = [
+ "csv",
+ "encode_unicode",
+ "is-terminal",
+ "lazy_static",
+ "term",
+ "unicode-width",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.86"
@@ -1788,6 +1878,17 @@ dependencies = [
  "bitflags 2.6.0",
 ]
 
+[[package]]
+name = "redox_users"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba009ff324d1fc1b900bd1fdb31564febe58a8ccc8a6fdbb93b543d33b13ca43"
+dependencies = [
+ "getrandom",
+ "libredox",
+ "thiserror",
+]
+
 [[package]]
 name = "regex"
 version = "1.10.6"
@@ -1983,6 +2084,12 @@ dependencies = [
  "untrusted",
 ]
 
+[[package]]
+name = "rustversion"
+version = "1.0.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "955d28af4278de8121b7ebeb796b6a45735dc01436d898801014aced2773a3d6"
+
 [[package]]
 name = "ryu"
 version = "1.0.18"
@@ -2226,6 +2333,17 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "term"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c59df8ac95d96ff9bede18eb7300b0fda5e5d8d90960e76f8e14ae765eedbf1f"
+dependencies = [
+ "dirs-next",
+ "rustversion",
+ "winapi",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.63"
@@ -2466,6 +2584,12 @@ dependencies = [
  "tinyvec",
 ]
 
+[[package]]
+name = "unicode-width"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0336d538f7abc86d282a4189614dfaa90810dfc2c6f6427eaf88e16311dd225d"
+
 [[package]]
 name = "universal-hash"
 version = "0.5.1"
@@ -2622,6 +2746,22 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
 [[package]]
 name = "winapi-util"
 version = "0.1.9"
@@ -2631,6 +2771,12 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows-core"
 version = "0.52.0"
diff --git a/central_backend/Cargo.toml b/central_backend/Cargo.toml
index 67fe668..6a3ccf9 100644
--- a/central_backend/Cargo.toml
+++ b/central_backend/Cargo.toml
@@ -34,4 +34,5 @@ tokio = { version = "1.39.2", features = ["full"] }
 tokio_schedule = "0.3.2"
 mime_guess = "2.0.5"
 rust-embed = "8.5.0"
-jsonwebtoken = { version = "9.3.0", features = ["use_pem"] }
\ No newline at end of file
+jsonwebtoken = { version = "9.3.0", features = ["use_pem"] }
+prettytable-rs = "0.10.0"
\ No newline at end of file
diff --git a/central_backend/src/energy/energy_actor.rs b/central_backend/src/energy/energy_actor.rs
index a6b7183..896aadb 100644
--- a/central_backend/src/energy/energy_actor.rs
+++ b/central_backend/src/energy/energy_actor.rs
@@ -5,33 +5,15 @@ use crate::devices::device::{
 use crate::devices::devices_list::DevicesList;
 use crate::energy::consumption;
 use crate::energy::consumption::EnergyConsumption;
+use crate::energy::engine::EnergyEngine;
 use crate::utils::time_utils::time_secs;
 use actix::prelude::*;
 use openssl::x509::X509Req;
-use std::collections::HashMap;
-
-#[derive(Default)]
-struct DeviceState {
-    last_ping: u64,
-}
-
-impl DeviceState {
-    fn is_online(&self) -> bool {
-        (time_secs() - self.last_ping) < constants::DEVICE_MAX_PING_TIME
-    }
-}
-
-#[derive(Default)]
-struct RelayState {
-    enabled: bool,
-    since: usize,
-}
 
 pub struct EnergyActor {
     curr_consumption: EnergyConsumption,
     devices: DevicesList,
-    devices_state: HashMap<DeviceId, DeviceState>,
-    relays_state: HashMap<DeviceRelayID, RelayState>,
+    engine: EnergyEngine,
 }
 
 impl EnergyActor {
@@ -39,20 +21,10 @@ impl EnergyActor {
         Ok(Self {
             curr_consumption: consumption::get_curr_consumption().await?,
             devices: DevicesList::load()?,
-            devices_state: Default::default(),
-            relays_state: Default::default(),
+            engine: EnergyEngine::default(),
         })
     }
 
-    fn device_state(&mut self, dev_id: &DeviceId) -> &mut DeviceState {
-        if !self.devices_state.contains_key(dev_id) {
-            self.devices_state
-                .insert(dev_id.clone(), Default::default());
-        }
-
-        self.devices_state.get_mut(dev_id).unwrap()
-    }
-
     async fn refresh(&mut self) -> anyhow::Result<()> {
         // Refresh energy
         self.curr_consumption = consumption::get_curr_consumption()
@@ -64,6 +36,9 @@ impl EnergyActor {
                 constants::FALLBACK_PRODUCTION_VALUE
             });
 
+        self.engine
+            .refresh(self.curr_consumption, &self.devices.full_list());
+
         Ok(())
     }
 }
@@ -285,8 +260,7 @@ impl Handler<SynchronizeDevice> for EnergyActor {
     type Result = anyhow::Result<Vec<RelaySyncStatus>>;
 
     fn handle(&mut self, msg: SynchronizeDevice, _ctx: &mut Context<Self>) -> Self::Result {
-        let s = self.device_state(&msg.0);
-        s.last_ping = time_secs();
+        self.engine.device_state(&msg.0).record_ping();
 
         // TODO : implement real code
         let mut v = vec![];
@@ -319,7 +293,7 @@ impl Handler<GetDevicesState> for EnergyActor {
             .full_list()
             .into_iter()
             .map(|d| {
-                let s = self.device_state(&d.id);
+                let s = self.engine.device_state(&d.id);
                 ResDevState {
                     id: d.id,
                     last_ping: time_secs() - s.last_ping,
diff --git a/central_backend/src/energy/engine.rs b/central_backend/src/energy/engine.rs
new file mode 100644
index 0000000..570cd12
--- /dev/null
+++ b/central_backend/src/energy/engine.rs
@@ -0,0 +1,83 @@
+use crate::constants;
+use crate::devices::device::{Device, DeviceId, DeviceRelayID};
+use crate::energy::consumption::EnergyConsumption;
+use crate::utils::time_utils::time_secs;
+use prettytable::{row, Table};
+use std::collections::HashMap;
+
+#[derive(Default)]
+pub struct DeviceState {
+    pub last_ping: u64,
+}
+
+impl DeviceState {
+    pub fn record_ping(&mut self) {
+        self.last_ping = time_secs();
+    }
+
+    pub fn is_online(&self) -> bool {
+        (time_secs() - self.last_ping) < constants::DEVICE_MAX_PING_TIME
+    }
+}
+
+#[derive(Default, Clone)]
+struct RelayState {
+    on: bool,
+    since: usize,
+}
+
+#[derive(Default)]
+pub struct EnergyEngine {
+    devices_state: HashMap<DeviceId, DeviceState>,
+    relays_state: HashMap<DeviceRelayID, RelayState>,
+}
+
+impl EnergyEngine {
+    pub fn device_state(&mut self, dev_id: &DeviceId) -> &mut DeviceState {
+        if !self.devices_state.contains_key(dev_id) {
+            self.devices_state
+                .insert(dev_id.clone(), Default::default());
+        }
+
+        self.devices_state.get_mut(dev_id).unwrap()
+    }
+
+    pub fn relay_state(&mut self, relay_id: DeviceRelayID) -> &mut RelayState {
+        if !self.relays_state.contains_key(&relay_id) {
+            self.relays_state.insert(relay_id, Default::default());
+        }
+
+        self.relays_state.get_mut(&relay_id).unwrap()
+    }
+
+    fn print_summary(&mut self, curr_consumption: EnergyConsumption, devices: &[Device]) {
+        log::info!("Current consumption: {curr_consumption}");
+
+        let mut table = Table::new();
+        table.add_row(row!["Device", "Relay", "On", "Since"]);
+        for d in devices {
+            for r in &d.relays {
+                let status = self.relay_state(r.id);
+                table.add_row(row![d.name, r.name, status.on.to_string(), status.since]);
+            }
+        }
+        table.printstd();
+    }
+
+    pub fn refresh(&mut self, curr_consumption: EnergyConsumption, devices: &[Device]) {
+        let new_relays_state = self.relays_state.clone();
+
+        // Forcefully turn off relays that belongs to offline devices
+
+        // Forcefully turn off relays with dependency conflicts
+
+        // Virtually turn off all relays that can be stopped
+
+        // Turn on relays based on priority / dependencies
+
+        // Turn on relays with running constraints
+
+        // Commit changes
+        self.print_summary(curr_consumption, devices); // TODO :replace
+    }
+}
diff --git a/central_backend/src/energy/mod.rs b/central_backend/src/energy/mod.rs
index 747d93a..c080861 100644
--- a/central_backend/src/energy/mod.rs
+++ b/central_backend/src/energy/mod.rs
@@ -1,2 +1,3 @@
 pub mod consumption;
 pub mod energy_actor;
+pub mod engine;