diff --git a/src/cli.rs b/src/cli.rs
index 9396ab4..7da04b8 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -1,3 +1,5 @@
+use std::path::PathBuf;
+
 use clap::{Parser, Subcommand, ValueEnum};
 
 #[derive(Parser)]
@@ -36,6 +38,8 @@ pub enum Commands {
     Dev { site: Site },
     /// Déployer un site (build + rsync)
     Deploy { site: Site },
+    /// Analyser un export CSV d'index EDF et comparer les tarifs
+    Edf { csv: PathBuf },
 }
 
 #[derive(Subcommand)]
diff --git a/src/commands/edf.rs b/src/commands/edf.rs
new file mode 100644
index 0000000..56cc581
--- /dev/null
+++ b/src/commands/edf.rs
@@ -0,0 +1,348 @@
+use std::fs;
+use std::path::Path;
+
+use anyhow::{Result, bail};
+
+struct Reading {
+    date: String,
+    hc_bleu: u64,
+    hp_bleu: u64,
+    hc_blanc: u64,
+    hp_blanc: u64,
+    hc_rouge: u64,
+    hp_rouge: u64,
+}
+
+struct Consumption {
+    hc_bleu: u64,
+    hp_bleu: u64,
+    hc_blanc: u64,
+    hp_blanc: u64,
+    hc_rouge: u64,
+    hp_rouge: u64,
+}
+
+impl Consumption {
+    fn total(&self) -> u64 {
+        self.hc_bleu + self.hp_bleu + self.hc_blanc + self.hp_blanc + self.hc_rouge + self.hp_rouge
+    }
+
+    fn total_hc(&self) -> u64 {
+        self.hc_bleu + self.hc_blanc + self.hc_rouge
+    }
+
+    fn total_hp(&self) -> u64 {
+        self.hp_bleu + self.hp_blanc + self.hp_rouge
+    }
+}
+
+// Tarifs EDF 6 kVA (€/kWh et €/mois)
+const BASE_ABO: f64 = 15.47;
+const BASE_KWH: f64 = 0.1952;
+
+const HPHC_ABO: f64 = 15.74;
+const HPHC_HP: f64 = 0.2081;
+const HPHC_HC: f64 = 0.1635;
+
+const TEMPO_ABO: f64 = 15.50;
+const TEMPO_BLEU_HC: f64 = 0.1232;
+const TEMPO_BLEU_HP: f64 = 0.1494;
+const TEMPO_BLANC_HC: f64 = 0.1391;
+const TEMPO_BLANC_HP: f64 = 0.1730;
+const TEMPO_ROUGE_HC: f64 = 0.1460;
+const TEMPO_ROUGE_HP: f64 = 0.6468;
+
+pub fn run(csv_path: &Path) -> Result<()> {
+    let raw = fs::read(csv_path)?;
+    let content = String::from_utf8(raw.clone())
+        .unwrap_or_else(|_| raw.iter().map(|&b| b as char).collect());
+
+    let readings = parse_readings(&content)?;
+
+    if readings.len() < 2 {
+        bail!("pas assez de relevés dans le fichier");
+    }
+
+    let last = readings.first().unwrap();
+
+    // Chercher le relevé le plus proche de last.date - 1 an
+    let target_date = one_year_before(&last.date);
+    let start = readings
+        .iter()
+        .min_by_key(|r| date_distance(&r.date, &target_date))
+        .unwrap();
+
+    let conso = Consumption {
+        hc_bleu: last.hc_bleu - start.hc_bleu,
+        hp_bleu: last.hp_bleu - start.hp_bleu,
+        hc_blanc: last.hc_blanc - start.hc_blanc,
+        hp_blanc: last.hp_blanc - start.hp_blanc,
+        hc_rouge: last.hc_rouge - start.hc_rouge,
+        hp_rouge: last.hp_rouge - start.hp_rouge,
+    };
+
+    println!("Période : {} → {} ({} relevés)", start.date, last.date, readings.len());
+    println!();
+
+    print_consumption(&conso);
+    println!();
+
+    print_tariffs(&conso);
+
+    Ok(())
+}
+
+fn parse_readings(content: &str) -> Result<Vec<Reading>> {
+    let mut readings = Vec::new();
+
+    for line in content.lines() {
+        let parts: Vec<&str> = line.split(';').collect();
+        if parts.len() != 8 {
+            continue;
+        }
+
+        let Ok(hc_bleu) = parts[2].parse::<u64>() else {
+            continue;
+        };
+
+        readings.push(Reading {
+            date: parts[0].to_string(),
+            hc_bleu,
+            hp_bleu: parts[3].parse().unwrap_or(0),
+            hc_blanc: parts[4].parse().unwrap_or(0),
+            hp_blanc: parts[5].parse().unwrap_or(0),
+            hc_rouge: parts[6].parse().unwrap_or(0),
+            hp_rouge: parts[7].parse().unwrap_or(0),
+        });
+    }
+
+    Ok(readings)
+}
+
+fn print_consumption(c: &Consumption) {
+    let total = c.total() as f64;
+
+    println!("Consommation sur la période :");
+    println!();
+    println!("  {:10} {:>8} {:>8}", "Type", "kWh", "%");
+    println!("  {:10} {:>8} {:>8}", "──────────", "────────", "────────");
+    print_conso_line("HC Bleu", c.hc_bleu, total);
+    print_conso_line("HP Bleu", c.hp_bleu, total);
+    print_conso_line("HC Blanc", c.hc_blanc, total);
+    print_conso_line("HP Blanc", c.hp_blanc, total);
+    print_conso_line("HC Rouge", c.hc_rouge, total);
+    print_conso_line("HP Rouge", c.hp_rouge, total);
+    println!("  {:10} {:>8} {:>8}", "──────────", "────────", "────────");
+    println!("  {:10} {:>8}", "TOTAL", format_kwh(c.total()));
+}
+
+fn print_conso_line(label: &str, kwh: u64, total: f64) {
+    let pct = format!("{:.1}", (kwh as f64 / total) * 100.0).replace('.', ",");
+    println!("  {:10} {:>8} {:>7}%", label, format_kwh(kwh), pct);
+}
+
+fn print_tariffs(c: &Consumption) {
+    let total = c.total();
+
+    let base_abo = BASE_ABO * 12.0;
+    let base_conso = total as f64 * BASE_KWH;
+    let hphc_abo = HPHC_ABO * 12.0;
+    let tempo_abo = TEMPO_ABO * 12.0;
+
+    let (base_total, hphc_total, tempo_total) = compute_tariffs(c);
+
+    println!("Comparatif des tarifs (6 kVA, 12 mois) :");
+    println!();
+
+    println!("  Base :");
+    print_tariff_line("Abonnement", base_abo, 0, 0.0);
+    print_tariff_line("Consommation", base_conso, total, BASE_KWH);
+    println!("    {:20} {:>9} €", "Total", format_eur(base_total));
+    println!();
+
+    println!("  HP/HC :");
+    print_tariff_line("Abonnement", hphc_abo, 0, 0.0);
+    print_tariff_line("Heures Pleines", c.total_hp() as f64 * HPHC_HP, c.total_hp(), HPHC_HP);
+    print_tariff_line("Heures Creuses", c.total_hc() as f64 * HPHC_HC, c.total_hc(), HPHC_HC);
+    println!("    {:20} {:>9} €", "Total", format_eur(hphc_total));
+    println!();
+
+    println!("  Tempo :");
+    print_tariff_line("Abonnement", tempo_abo, 0, 0.0);
+    print_tariff_line("Bleu HC", c.hc_bleu as f64 * TEMPO_BLEU_HC, c.hc_bleu, TEMPO_BLEU_HC);
+    print_tariff_line("Bleu HP", c.hp_bleu as f64 * TEMPO_BLEU_HP, c.hp_bleu, TEMPO_BLEU_HP);
+    print_tariff_line("Blanc HC", c.hc_blanc as f64 * TEMPO_BLANC_HC, c.hc_blanc, TEMPO_BLANC_HC);
+    print_tariff_line("Blanc HP", c.hp_blanc as f64 * TEMPO_BLANC_HP, c.hp_blanc, TEMPO_BLANC_HP);
+    print_tariff_line("Rouge HC", c.hc_rouge as f64 * TEMPO_ROUGE_HC, c.hc_rouge, TEMPO_ROUGE_HC);
+    print_tariff_line("Rouge HP", c.hp_rouge as f64 * TEMPO_ROUGE_HP, c.hp_rouge, TEMPO_ROUGE_HP);
+    println!("    {:20} {:>9} €", "Total", format_eur(tempo_total));
+    println!();
+
+    // Résumé
+    println!("Résumé :");
+    println!();
+    println!("  {:8} {:>12} {:>16}", "Option", "Coût annuel", "vs Base");
+    println!("  {:8} {:>12} {:>16}", "────────", "────────────", "────────────────");
+
+    let mut options = vec![
+        ("Tempo", tempo_total),
+        ("HP/HC", hphc_total),
+        ("Base", base_total),
+    ];
+    options.sort_by(|a, b| a.1.partial_cmp(&b.1).unwrap());
+
+    for (name, cost) in &options {
+        let diff = cost - base_total;
+        let pct = (diff / base_total) * 100.0;
+        if *name == "Base" {
+            println!("  {:8} {:>10} €  référence", name, format_eur(*cost));
+        } else {
+            println!("  {:8} {:>10} €  {} € ({:+.0}%)", name, format_eur(*cost), format_eur(diff), pct);
+        }
+    }
+
+    println!();
+    println!("Coût moyen au kWh ({} kWh) :", format_kwh(total));
+    println!();
+    for (name, cost) in &options {
+        println!("  {:8} {} cts/kWh", name, format_eur((cost / total as f64) * 100.0));
+    }
+}
+
+fn print_tariff_line(label: &str, cost: f64, kwh: u64, rate: f64) {
+    if kwh == 0 {
+        println!("    {:20} {:>9} €", label, format_eur(cost));
+    } else {
+        println!("    {:20} {:>9} € ({:>5} kWh × {} €)", label, format_eur(cost), format_kwh(kwh), format_rate(rate));
+    }
+}
+
+fn format_eur(value: f64) -> String {
+    let abs = value.abs();
+    let integer = abs as u64;
+    let decimals = format!("{:.2}", abs.fract()).trim_start_matches('0').replace('.', ",");
+    let sign = if value < 0.0 { "-" } else { "" };
+
+    if integer >= 1000 {
+        format!("{}{} {:03}{}", sign, integer / 1000, integer % 1000, decimals)
+    } else {
+        format!("{}{}{}", sign, integer, decimals)
+    }
+}
+
+fn format_rate(value: f64) -> String {
+    format!("{:.4}", value).replace('.', ",")
+}
+
+fn format_kwh(kwh: u64) -> String {
+    if kwh >= 1000 {
+        let thousands = kwh / 1000;
+        let rest = kwh % 1000;
+        format!("{} {:03}", thousands, rest)
+    } else {
+        kwh.to_string()
+    }
+}
+
+// DD/MM/YYYY → (YYYY, MM, DD)
+fn parse_date(date: &str) -> (i32, u32, u32) {
+    let parts: Vec<&str> = date.split('/').collect();
+    let day: u32 = parts[0].parse().unwrap();
+    let month: u32 = parts[1].parse().unwrap();
+    let year: i32 = parts[2].parse().unwrap();
+    (year, month, day)
+}
+
+fn one_year_before(date: &str) -> String {
+    let (year, month, day) = parse_date(date);
+    format!("{:02}/{:02}/{}", day, month, year - 1)
+}
+
+fn date_distance(a: &str, b: &str) -> i32 {
+    let (ya, ma, da) = parse_date(a);
+    let (yb, mb, db) = parse_date(b);
+    let days_a = ya * 365 + ma as i32 * 30 + da as i32;
+    let days_b = yb * 365 + mb as i32 * 30 + db as i32;
+    (days_a - days_b).abs()
+}
+
+fn compute_tariffs(c: &Consumption) -> (f64, f64, f64) {
+    let total = c.total();
+
+    let base_total = BASE_ABO * 12.0 + total as f64 * BASE_KWH;
+
+    let hphc_total =
+        HPHC_ABO * 12.0 + c.total_hp() as f64 * HPHC_HP + c.total_hc() as f64 * HPHC_HC;
+
+    let tempo_total = TEMPO_ABO * 12.0
+        + c.hc_bleu as f64 * TEMPO_BLEU_HC
+        + c.hp_bleu as f64 * TEMPO_BLEU_HP
+        + c.hc_blanc as f64 * TEMPO_BLANC_HC
+        + c.hp_blanc as f64 * TEMPO_BLANC_HP
+        + c.hc_rouge as f64 * TEMPO_ROUGE_HC
+        + c.hp_rouge as f64 * TEMPO_ROUGE_HP;
+
+    (base_total, hphc_total, tempo_total)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_parse_and_tariffs() {
+        let csv = "\
+Récapitulatif\n\
+\n\
+Date;Type;HC Bleu;HP Bleu;HC Blanc;HP Blanc;HC Rouge;HP Rouge\n\
+01/01/2025;Index;13000;6500;2800;1400;800;500\n\
+15/06/2024;Index;11500;5700;2400;1200;650;400\n\
+01/01/2024;Index;10000;5000;2000;1000;500;300\n";
+
+        let readings = parse_readings(csv).unwrap();
+        assert_eq!(readings.len(), 3);
+
+        let last = readings.first().unwrap();
+        let target_date = one_year_before(&last.date);
+        let start = readings
+            .iter()
+            .min_by_key(|r| date_distance(&r.date, &target_date))
+            .unwrap();
+
+        assert_eq!(last.date, "01/01/2025");
+        assert_eq!(start.date, "01/01/2024");
+
+        let conso = Consumption {
+            hc_bleu: last.hc_bleu - start.hc_bleu,
+            hp_bleu: last.hp_bleu - start.hp_bleu,
+            hc_blanc: last.hc_blanc - start.hc_blanc,
+            hp_blanc: last.hp_blanc - start.hp_blanc,
+            hc_rouge: last.hc_rouge - start.hc_rouge,
+            hp_rouge: last.hp_rouge - start.hp_rouge,
+        };
+
+        assert_eq!(conso.hc_bleu, 3000);
+        assert_eq!(conso.hp_bleu, 1500);
+        assert_eq!(conso.hc_blanc, 800);
+        assert_eq!(conso.hp_blanc, 400);
+        assert_eq!(conso.hc_rouge, 300);
+        assert_eq!(conso.hp_rouge, 200);
+        assert_eq!(conso.total(), 6200);
+
+        let (base, hphc, tempo) = compute_tariffs(&conso);
+
+        assert!((base - 1395.88).abs() < 0.01);
+        assert!((hphc - 1296.24).abs() < 0.01);
+        assert!((tempo - 1133.34).abs() < 0.01);
+    }
+
+    #[test]
+    fn test_utf8_parsing() {
+        let csv = "Récapitulatif\n\nDate;Type;HC Bleu;HP Bleu;HC Blanc;HP Blanc;HC Rouge;HP Rouge\n01/01/2024;Index;1000;500;100;50;10;5\n01/01/2025;Index;2000;800;200;100;30;15\n";
+        let readings = parse_readings(csv).unwrap();
+
+        assert_eq!(readings.len(), 2);
+        assert_eq!(readings[0].hc_bleu, 1000);
+        assert_eq!(readings[1].hc_bleu, 2000);
+    }
+}
diff --git a/src/commands/mod.rs b/src/commands/mod.rs
index 392fc84..23a24a1 100644
--- a/src/commands/mod.rs
+++ b/src/commands/mod.rs
@@ -1,4 +1,5 @@
 pub mod desktop;
 pub mod dev;
 pub mod deploy;
+pub mod edf;
 pub mod site;
diff --git a/src/main.rs b/src/main.rs
index d7179b9..4dfba80 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,5 +13,6 @@ async fn main() -> Result<()> {
         Commands::Desktop(cmd) => commands::desktop::run(&cmd),
         Commands::Dev { site } => commands::dev::run(site).await,
         Commands::Deploy { site } => commands::deploy::run(site).await,
+        Commands::Edf { csv } => commands::edf::run(&csv),
     }
 }