diff --git a/custom_consumption/Cargo.lock b/custom_consumption/Cargo.lock
index 5e51b8b..266dcc9 100644
--- a/custom_consumption/Cargo.lock
+++ b/custom_consumption/Cargo.lock
@@ -929,6 +929,7 @@ dependencies = [
  "egui",
  "env_logger",
  "lazy_static",
+ "log",
 ]
 
 [[package]]
diff --git a/custom_consumption/Cargo.toml b/custom_consumption/Cargo.toml
index 621b490..3eaf2e8 100644
--- a/custom_consumption/Cargo.toml
+++ b/custom_consumption/Cargo.toml
@@ -5,6 +5,7 @@ edition = "2021"
 
 [dependencies]
 env_logger = "0.11.3"
+log = "0.4.22"
 clap = { version = "4.5.8", features = ["derive", "env"] }
 egui = "0.27.2"
 eframe = "0.27.2"
diff --git a/custom_consumption/src/app_config.rs b/custom_consumption/src/app_config.rs
index 8b6a8cd..88fc45a 100644
--- a/custom_consumption/src/app_config.rs
+++ b/custom_consumption/src/app_config.rs
@@ -16,6 +16,10 @@ pub struct AppConfig {
     /// Maximal value
     #[clap(long, default_value_t = 5000)]
     pub max: i64,
+
+    /// Minimum interval between two persistence (milliseconds)
+    #[clap(long, default_value_t = 500)]
+    pub min_save_interval: u128,
 }
 
 lazy_static::lazy_static! {
diff --git a/custom_consumption/src/lib.rs b/custom_consumption/src/lib.rs
index 62a6f82..9ef3282 100644
--- a/custom_consumption/src/lib.rs
+++ b/custom_consumption/src/lib.rs
@@ -1 +1,2 @@
 pub mod app_config;
+pub mod utils;
diff --git a/custom_consumption/src/main.rs b/custom_consumption/src/main.rs
index 988f194..33d6471 100644
--- a/custom_consumption/src/main.rs
+++ b/custom_consumption/src/main.rs
@@ -1,4 +1,5 @@
 use custom_consumption::app_config::AppConfig;
+use custom_consumption::utils::time_millis;
 
 fn main() {
     env_logger::init();
@@ -17,6 +18,8 @@ fn main() {
 
 struct MyApp {
     consumption: i64,
+    last_saved_consumption: i64,
+    last_save_time: u128,
 }
 
 impl Default for MyApp {
@@ -32,12 +35,25 @@ impl Default for MyApp {
 
         Self {
             consumption: prev_consumption,
+            last_saved_consumption: prev_consumption,
+            last_save_time: time_millis(),
         }
     }
 }
 
 impl eframe::App for MyApp {
     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        if self.consumption != self.last_saved_consumption
+            && self.last_save_time + AppConfig::get().min_save_interval < time_millis()
+        {
+            log::info!("Persist {}", self.consumption);
+            self.last_saved_consumption = self.consumption;
+            self.last_save_time = time_millis();
+
+            std::fs::write(AppConfig::get().file_path(), self.consumption.to_string())
+                .expect("Failed to save value!");
+        }
+
         egui::CentralPanel::default().show(ctx, |ui| {
             ui.heading("Custom consumption");
             ui.add(
diff --git a/custom_consumption/src/utils.rs b/custom_consumption/src/utils.rs
new file mode 100644
index 0000000..4c73ed9
--- /dev/null
+++ b/custom_consumption/src/utils.rs
@@ -0,0 +1,10 @@
+use std::time::{SystemTime, UNIX_EPOCH};
+
+/// Get the current time since epoch
+
+pub fn time_millis() -> u128 {
+    SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap()
+        .as_millis()
+}