diff --git a/central_backend/src/app_config.rs b/central_backend/src/app_config.rs
index 3974779..8a76687 100644
--- a/central_backend/src/app_config.rs
+++ b/central_backend/src/app_config.rs
@@ -76,6 +76,14 @@ pub struct AppConfig {
     #[arg(short, long, env, default_value = "storage")]
     storage: String,
 
+    /// The minimal production that must be excluded when selecting relays to turn on
+    #[arg(short('m'), long, env, default_value_t = -500)]
+    pub production_margin: i32,
+
+    /// Energy refresh operations interval, in seconds
+    #[arg(short('i'), long, env, default_value_t = 30)]
+    pub refresh_interval: u64,
+
     /// Consumption backend provider
     #[clap(subcommand)]
     pub consumption_backend: Option<ConsumptionBackend>,
diff --git a/central_backend/src/constants.rs b/central_backend/src/constants.rs
index 5c44b09..a1a1c0c 100644
--- a/central_backend/src/constants.rs
+++ b/central_backend/src/constants.rs
@@ -1,11 +1,6 @@
-use std::time::Duration;
-
 /// Name of the cookie that contains session information
 pub const SESSION_COOKIE_NAME: &str = "X-session-cookie";
 
-/// Energy refresh operations interval
-pub const ENERGY_REFRESH_INTERVAL: Duration = Duration::from_secs(30);
-
 /// Maximum time after a ping during which a device is considered "up"
 pub const DEVICE_MAX_PING_TIME: u64 = 30;
 
diff --git a/central_backend/src/energy/energy_actor.rs b/central_backend/src/energy/energy_actor.rs
index 4b9acca..b169b98 100644
--- a/central_backend/src/energy/energy_actor.rs
+++ b/central_backend/src/energy/energy_actor.rs
@@ -1,3 +1,4 @@
+use crate::app_config::AppConfig;
 use crate::constants;
 use crate::devices::device::{
     Device, DeviceGeneralInfo, DeviceId, DeviceInfo, DeviceRelay, DeviceRelayID,
@@ -9,6 +10,7 @@ use crate::energy::engine::EnergyEngine;
 use crate::utils::time_utils::time_secs;
 use actix::prelude::*;
 use openssl::x509::X509Req;
+use std::time::Duration;
 
 pub struct EnergyActor {
     curr_consumption: EnergyConsumption,
@@ -49,12 +51,15 @@ impl Actor for EnergyActor {
     fn started(&mut self, ctx: &mut Self::Context) {
         log::info!("Energy actor successfully started!");
 
-        ctx.run_interval(constants::ENERGY_REFRESH_INTERVAL, |act, _ctx| {
-            log::info!("Performing energy refresh operation");
-            if let Err(e) = futures::executor::block_on(act.refresh()) {
-                log::error!("Energy refresh failed! {e}")
-            }
-        });
+        ctx.run_interval(
+            Duration::from_secs(AppConfig::get().refresh_interval),
+            |act, _ctx| {
+                log::info!("Performing energy refresh operation");
+                if let Err(e) = futures::executor::block_on(act.refresh()) {
+                    log::error!("Energy refresh failed! {e}")
+                }
+            },
+        );
     }
 
     fn stopped(&mut self, _ctx: &mut Self::Context) {
diff --git a/central_backend/src/energy/engine.rs b/central_backend/src/energy/engine.rs
index 8cec247..ad6675d 100644
--- a/central_backend/src/energy/engine.rs
+++ b/central_backend/src/energy/engine.rs
@@ -1,5 +1,6 @@
 use std::collections::HashMap;
 
+use crate::app_config::AppConfig;
 use prettytable::{row, Table};
 
 use crate::constants;
@@ -87,6 +88,20 @@ impl DeviceRelay {
     }
 }
 
+fn sum_relays_consumption(state: &RelaysState, devices: &[Device]) -> usize {
+    let mut consumption = 0;
+
+    for d in devices {
+        for r in &d.relays {
+            if matches!(state.get(&r.id).map(|r| r.on), Some(true)) {
+                consumption += r.consumption;
+            }
+        }
+    }
+
+    consumption
+}
+
 impl EnergyEngine {
     pub fn device_state(&mut self, dev_id: &DeviceId) -> &mut DeviceState {
         self.devices_state.entry(dev_id.clone()).or_default();
@@ -102,22 +117,60 @@ impl EnergyEngine {
         log::info!("Current consumption: {curr_consumption}");
 
         let mut table = Table::new();
-        table.add_row(row!["Device", "Relay", "On", "Since"]);
+        table.add_row(row![
+            "Device",
+            "Relay",
+            "Consumption",
+            "Min downtime / uptime",
+            "On",
+            "Since",
+            "Online",
+            "Enabled device / relay"
+        ]);
         for d in devices {
+            let dev_online = self.device_state(&d.id).is_online();
             for r in &d.relays {
                 let status = self.relay_state(r.id);
                 table.add_row(row![
                     d.name,
                     r.name,
+                    r.consumption,
+                    format!("{} / {}", r.minimal_downtime, r.minimal_uptime),
                     status.is_on().to_string(),
-                    status.since
+                    status.since,
+                    match dev_online {
+                        true => "Online",
+                        false => "Offline",
+                    },
+                    format!(
+                        "{} / {}",
+                        match d.enabled {
+                            true => "Enabled",
+                            false => "Disabled",
+                        },
+                        match r.enabled {
+                            true => "Enabled",
+                            false => "Disabled",
+                        }
+                    )
                 ]);
             }
         }
         table.printstd();
     }
 
+    pub fn estimated_consumption_without_relays(
+        &self,
+        curr_consumption: EnergyConsumption,
+        devices: &[Device],
+    ) -> EnergyConsumption {
+        curr_consumption - sum_relays_consumption(&self.relays_state, devices) as i32
+    }
+
     pub fn refresh(&mut self, curr_consumption: EnergyConsumption, devices: &[Device]) {
+        let base_production = self.estimated_consumption_without_relays(curr_consumption, devices);
+        log::info!("Estimated base production: {base_production}");
+
         // Force creation of missing relays state
         for d in devices {
             for r in &d.relays {
@@ -238,7 +291,13 @@ impl EnergyEngine {
                     continue;
                 }
 
-                // TODO : check consumption
+                let new_consumption = base_production
+                    + sum_relays_consumption(&new_relays_state, devices) as EnergyConsumption;
+
+                if new_consumption + relay.consumption as i32 > AppConfig::get().production_margin {
+                    continue;
+                }
+
                 log::info!("Turn on relay {}", relay.name);
                 new_relays_state.get_mut(&relay.id).unwrap().on = true;
                 changed = true;