diff --git a/central_backend/src/energy/engine.rs b/central_backend/src/energy/engine.rs
index 85ad257..b1b7ab8 100644
--- a/central_backend/src/energy/engine.rs
+++ b/central_backend/src/energy/engine.rs
@@ -1,9 +1,11 @@
+use std::collections::HashMap;
+
+use prettytable::{row, Table};
+
 use crate::constants;
 use crate::devices::device::{Device, DeviceId, DeviceRelay, 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 {
@@ -26,6 +28,16 @@ pub struct RelayState {
     since: usize,
 }
 
+impl RelayState {
+    fn is_on(&self) -> bool {
+        self.on
+    }
+
+    fn is_off(&self) -> bool {
+        !self.on
+    }
+}
+
 type RelaysState = HashMap<DeviceRelayID, RelayState>;
 
 #[derive(Default)]
@@ -35,10 +47,37 @@ pub struct EnergyEngine {
 }
 
 impl DeviceRelay {
-    fn relay_has_running_dependencies(&self, s: &RelaysState, devices: &[Device]) -> bool {
+    // Note : this function is not recursive
+    fn has_running_dependencies(&self, s: &RelaysState, devices: &[Device]) -> bool {
         for d in devices {
             for r in &d.relays {
-                if r.depends_on.contains(&self.id) && s.get(&r.id).unwrap().on {
+                if r.depends_on.contains(&self.id) && s.get(&r.id).unwrap().is_on() {
+                    return true;
+                }
+            }
+        }
+
+        false
+    }
+
+    // Note : this function is not recursive
+    fn is_missing_dependencies(&self, s: &RelaysState) -> bool {
+        self.depends_on.iter().any(|id| s.get(id).unwrap().is_off())
+    }
+
+    fn is_having_conflict(&self, s: &RelaysState, devices: &[Device]) -> bool {
+        if self
+            .conflicts_with
+            .iter()
+            .any(|id| s.get(id).unwrap().is_on())
+        {
+            return true;
+        }
+
+        // Reverse search
+        for device in devices {
+            for r in &device.relays {
+                if s.get(&r.id).unwrap().is_on() && r.conflicts_with.contains(&self.id) {
                     return true;
                 }
             }
@@ -67,7 +106,12 @@ impl EnergyEngine {
         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.add_row(row![
+                    d.name,
+                    r.name,
+                    status.is_on().to_string(),
+                    status.since
+                ]);
             }
         }
         table.printstd();
@@ -93,25 +137,29 @@ impl EnergyEngine {
             }
         }
 
+        // Forcefully turn off disabled relays
+        for d in devices {
+            for r in &d.relays {
+                if !r.enabled {
+                    new_relays_state.get_mut(&r.id).unwrap().on = false;
+                }
+            }
+        }
+
         // Forcefully turn off relays with missing dependency
         loop {
             let mut changed = false;
 
             for d in devices {
-                if !self.device_state(&d.id).is_online() {
-                    for r in &d.relays {
-                        if !new_relays_state.get(&r.id).unwrap().on {
-                            continue;
-                        }
+                for r in &d.relays {
+                    if new_relays_state.get(&r.id).unwrap().is_off() {
+                        continue;
+                    }
 
-                        // Check if any dependency of relay is off
-                        if r.depends_on
-                            .iter()
-                            .any(|d| !new_relays_state.get(d).unwrap().on)
-                        {
-                            new_relays_state.get_mut(&r.id).unwrap().on = false;
-                            changed = true;
-                        }
+                    // Check if any dependency of relay is off
+                    if r.is_missing_dependencies(&new_relays_state) {
+                        new_relays_state.get_mut(&r.id).unwrap().on = false;
+                        changed = true;
                     }
                 }
             }
@@ -128,7 +176,7 @@ impl EnergyEngine {
             for d in devices {
                 for r in &d.relays {
                     let state = new_relays_state.get(&r.id).unwrap();
-                    if !state.on {
+                    if state.is_off() {
                         continue;
                     }
 
@@ -138,7 +186,7 @@ impl EnergyEngine {
                     }
 
                     // Check that no relay that depends on this relay are turned on
-                    if r.relay_has_running_dependencies(&new_relays_state, devices) {
+                    if r.has_running_dependencies(&new_relays_state, devices) {
                         continue;
                     }
 
@@ -152,19 +200,63 @@ impl EnergyEngine {
             }
         }
 
-        // TODO Turn on relays based on priority / dependencies / enabled / min downtime
+        // TODO Turn on relays with running constraints (only ENABLED)
 
-        // TODO Turn on relays with running constraints
+        // Order relays
+        let mut ordered_relays = devices
+            .iter()
+            .filter(|d| self.device_state(&d.id).is_online() && d.enabled)
+            .flat_map(|d| &d.relays)
+            .filter(|r| r.enabled)
+            .collect::<Vec<_>>();
+        ordered_relays.sort_by_key(|r| r.priority);
+        ordered_relays.reverse();
 
-        // TODO Commit changes
+        loop {
+            let mut changed = false;
+            for relay in &ordered_relays {
+                if new_relays_state.get(&relay.id).unwrap().is_on() {
+                    continue;
+                }
 
+                if !relay.enabled {
+                    continue;
+                }
+
+                let real_relay_state = self.relays_state.get(&relay.id).unwrap();
+                if real_relay_state.is_off()
+                    && (real_relay_state.since + relay.minimal_downtime) as u64 > time_secs()
+                {
+                    continue;
+                }
+
+                if relay.is_missing_dependencies(&new_relays_state) {
+                    continue;
+                }
+
+                if relay.is_having_conflict(&new_relays_state, devices) {
+                    continue;
+                }
+
+                // TODO : check consumption
+                log::info!("Turn on relay {}", relay.name);
+                new_relays_state.get_mut(&relay.id).unwrap().on = true;
+                changed = true;
+            }
+
+            if !changed {
+                break;
+            }
+        }
+
+        // Commit changes
         for (id, new_state) in &new_relays_state {
             let curr_state = self.relay_state(*id);
             if curr_state.on != new_state.on {
                 curr_state.on = new_state.on;
                 curr_state.since = time_secs() as usize;
+                log::info!("Changing state of {id:?} to {}", new_state.on);
             }
-            log::info!("Changing state of {id:?}");
         }
 
         self.print_summary(curr_consumption, devices);