diff --git a/Abrechnung/form.json b/Abrechnung/form.json
index 97aa22f..d5fc2f5 100644
--- a/Abrechnung/form.json
+++ b/Abrechnung/form.json
@@ -104,7 +104,7 @@
               "caption": "Einheit",
               "name": "unit_type",
               "width": "20%",
-              "add": "Strombezug",
+              "add": "Netztarif",
               "edit": {
                 "type": "Select",
                 "options": [
diff --git a/Abrechnung/module.php b/Abrechnung/module.php
index eb56e63..e7aa366 100644
--- a/Abrechnung/module.php
+++ b/Abrechnung/module.php
@@ -141,6 +141,8 @@ class Abrechnung extends IPSModule
 
 private function CalculatePowerCosts($powerMeters, $tariffs, $userId, $from, $to)
 {
+    IPS_LogMessage('Abrechnung', "⚡ Starte Stromkostenberechnung von " . date('d.m.Y H:i', $from) . " bis " . date('d.m.Y H:i', $to));
+
     $html = "<table border='1' cellspacing='0' cellpadding='3' width='100%' style='font-size:8px;'>
     <tr style='background-color:#f0f0f0;'>
         <th>Zähler</th>
@@ -158,9 +160,8 @@ private function CalculatePowerCosts($powerMeters, $tariffs, $userId, $from, $to
 
     // Initialisierung
     $acc = [];
-
-    // Benutzerzähler laden
     $meters = [];
+
     foreach ($powerMeters as $m) {
         if ($m['user_id'] != $userId) continue;
         $name = $m['name'];
@@ -179,6 +180,7 @@ private function CalculatePowerCosts($powerMeters, $tariffs, $userId, $from, $to
     }
 
     if (empty($meters)) {
+        IPS_LogMessage('Abrechnung', "⚠️ Keine Stromzähler für Benutzer $userId gefunden.");
         $html .= "<tr><td colspan='11' align='center'>Keine Stromzähler für diesen Benutzer</td></tr></table><br>";
         return ['html'=>$html, 'sum'=>0.0];
     }
@@ -187,12 +189,16 @@ private function CalculatePowerCosts($powerMeters, $tariffs, $userId, $from, $to
     for ($ts = $from; $ts < $to; $ts += 900) {
         $slotEnd = min($to, $ts + 900);
 
-        // Tarife für diesen Zeitraum holen
+        // Tarife abrufen
         $pGrid  = $this->getTariffPriceAt($tariffs, ['Netztarif'], $ts);
         $pSolar = $this->getTariffPriceAt($tariffs, ['Solartarif'], $ts);
         $pFeed  = $this->getTariffPriceAt($tariffs, ['Einspeisetarif'], $ts);
 
-        // Deltas
+        IPS_LogMessage('Abrechnung', sprintf("⏱ %s – %s | Tarife: Netz=%.3f Rp, Solar=%.3f Rp, Einspeise=%.3f Rp",
+            date('d.m.Y H:i', $ts), date('H:i', $slotEnd),
+            $pGrid ?? 0, $pSolar ?? 0, $pFeed ?? 0
+        ));
+
         $impTotal = 0.0;
         $expTotal = 0.0;
         $slot = [];
@@ -211,6 +217,8 @@ private function CalculatePowerCosts($powerMeters, $tariffs, $userId, $from, $to
             $slot[$name] = ['imp'=>$impDelta, 'exp'=>$expDelta];
             $impTotal += $impDelta;
             $expTotal += $expDelta;
+
+            IPS_LogMessage('Abrechnung', sprintf("   → %s: imp=%.4f, exp=%.4f", $name, $impDelta, $expDelta));
         }
 
         if ($impTotal <= 0 && $expTotal <= 0) continue;
@@ -223,7 +231,6 @@ private function CalculatePowerCosts($powerMeters, $tariffs, $userId, $from, $to
                 $imp = $slot[$name]['imp'];
                 $exp = $slot[$name]['exp'];
 
-                // Mengen
                 $acc[$name]['imp'] += $imp;
                 $acc[$name]['exp'] += $exp;
 
@@ -232,10 +239,11 @@ private function CalculatePowerCosts($powerMeters, $tariffs, $userId, $from, $to
                 $acc[$name]['solareinspeisung']+= (1 - $ratio) * $exp;
                 $acc[$name]['solarverkauf']    += $ratio * $exp;
 
-                // Kosten / Erträge
                 if ($pSolar !== null) $acc[$name]['cost_solar'] += ($imp * $pSolar) / 100;
                 if ($pFeed  !== null) $acc[$name]['rev_feedin']  += ((1 - $ratio) * $exp * $pFeed) / 100;
             }
+
+            IPS_LogMessage('Abrechnung', sprintf("   ⚙️ Fall 1 (imp<=exp): ratio=%.3f", $ratio));
         }
 
         // ===== Fall 2: import > export =====
@@ -257,10 +265,12 @@ private function CalculatePowerCosts($powerMeters, $tariffs, $userId, $from, $to
                 if ($pSolar !== null) $acc[$name]['cost_solar'] += ($ratio * $imp * $pSolar) / 100;
                 if ($pFeed  !== null) $acc[$name]['rev_feedin'] += ($exp * $pFeed) / 100;
             }
+
+            IPS_LogMessage('Abrechnung', sprintf("   ⚙️ Fall 2 (imp>exp): ratio=%.3f", $ratio));
         }
     }
 
-    // Ausgabe
+    // Ausgabe erzeugen
     $grand = 0.0;
     foreach ($acc as $name => $v) {
         $sum = $v['cost_solar'] + $v['cost_grid'] - $v['rev_feedin'];
@@ -286,52 +296,11 @@ private function CalculatePowerCosts($powerMeters, $tariffs, $userId, $from, $to
         <td align='right'>" . number_format($grand, 2) . "</td>
     </tr></table><br>";
 
+    IPS_LogMessage('Abrechnung', sprintf("✅ Stromkosten fertig: %.2f CHF total", $grand));
+
     return ['html'=>$html, 'sum'=>$grand];
 }
 
-
-
-
-    // ====================== Nebenkosten ======================
-
-private function CalculateAdditionalCosts($waterMeters, $tariffs, $userId, $from, $to)
-{
-    $html = "<table border='1' cellspacing='0' cellpadding='3' width='100%' style='font-size:8px;'>
-    <tr style='background-color:#f0f0f0;'>
-        <th>Zähler</th><th>Typ</th><th>Start</th><th>Ende</th>
-        <th>Zähler Start</th><th>Zähler Ende</th><th>Verbrauch</th><th>Tarif (Rp)</th><th>Kosten (CHF)</th>
-    </tr>";
-
-    $total = 0.0;
-    $usedTariffs = [];
-
-    foreach ($waterMeters as $m) {
-        if ($m['user_id'] != $userId) continue;
-        $type = $m['meter_type'] ?? 'Warmwasser';
-        $cost = $this->AddMeterToPDFRow($m, $tariffs, $from, $to, $type);
-        $html .= $cost['row'];
-        $total += $cost['value'];
-        $usedTariffs = array_merge($usedTariffs, $cost['tariffs']);
-    }
-
-    $html .= "<tr style='background-color:#f9f9f9; font-weight:bold;'>
-        <td colspan='8' align='right'>Total Nebenkosten:</td>
-        <td align='right'>" . number_format($total, 2) . "</td>
-    </tr></table><br>";
-
-    // 👇 Tarifliste anhängen
-    if (!empty($usedTariffs)) {
-        $html .= "<p><strong>Angewendete Nebenkostentarife:</strong></p><ul>";
-        foreach ($usedTariffs as $t) {
-            $html .= "<li>" . date('d.m.Y', $t['start']) . " – " . date('d.m.Y', $t['end']) . ": " .
-                number_format($t['price'], 2) . " Rp</li>";
-        }
-        $html .= "</ul><br>";
-    }
-
-    return ['html' => $html, 'sum' => $total];
-}
-
     // ====================== Kernberechnung ======================
 
 private function AddMeterToPDFRow($meter, $tariffs, $from, $to, $type)