diff --git a/Abrechnung/module.php b/Abrechnung/module.php
index 916ed08..6679f8f 100644
--- a/Abrechnung/module.php
+++ b/Abrechnung/module.php
@@ -89,7 +89,7 @@ class Abrechnung extends IPSModule
             return false;
         }
 
-        // Stromkosten einmal für alle User berechnen
+        // Stromkosten einmal für alle User berechnen (15-Minuten-Logik)
         $this->CalculateAllPowerCosts($power, $tariffs, $from, $to);
 
         $pdf = new TCPDF('P', 'mm', 'A4', true, 'UTF-8', false);
@@ -119,7 +119,7 @@ class Abrechnung extends IPSModule
         $html .= "<h3>⚡ Stromkosten</h3>" . $powerResult['html'];
         $totalPower = $powerResult['sum'];
 
-        // Nebenkosten (Wasser/Wärme)
+        // Nebenkosten (Wasser/Wärme) – einfache Differenz von Beginn bis Ende
         $additionalResult = $this->CalculateAdditionalCosts($water, $tariffs, $user['id'], $from, $to);
         $html .= "<h3>💧 Nebenkosten (Wasser/Wärme)</h3>" . $additionalResult['html'];
         $totalAdditional = $additionalResult['sum'];
@@ -216,14 +216,14 @@ class Abrechnung extends IPSModule
 
                 // Verhältnis PV / Netz pro User
                 if ($impTotal <= $expTotal && $expTotal > 0.0) {
-                    $ratio        = $impTotal / $expTotal;
-                    $pvCoversAll  = true;
+                    $ratio       = $impTotal / $expTotal;
+                    $pvCoversAll = true;
                 } elseif ($impTotal > 0.0) {
-                    $ratio        = $expTotal / $impTotal;
-                    $pvCoversAll  = false;
+                    $ratio       = $expTotal / $impTotal;
+                    $pvCoversAll = false;
                 } else {
-                    $ratio        = 0.0;
-                    $pvCoversAll  = true;
+                    $ratio       = 0.0;
+                    $pvCoversAll = true;
                 }
 
                 // Werte pro Zähler verteilen
@@ -359,62 +359,75 @@ class Abrechnung extends IPSModule
         return ['html' => $html, 'sum' => $total];
     }
 
-private function AddMeterToPDFRow($meter, $tariffs, $from, $to, $type)
-{
-    $varId = $meter['var_consumption'];
+    private function AddMeterToPDFRow($meter, $tariffs, $from, $to, $type)
+    {
+        $rows        = '';
+        $totalCost   = 0.0;
+        $usedTariffs = [];
+        $varId       = $meter['var_consumption'];
 
-    if (!IPS_VariableExists($varId)) {
-        return ['row' => '', 'value' => 0, 'tariffs' => []];
-    }
-
-    // ---- 1) Start- und Endwerte direkt holen ----
-    $startValue = $this->GetValueAt($varId, $from, false);   // letzter Wert VOR dem Start
-    $endValue   = $this->GetValueAt($varId, $to, true);      // erster Wert NACH dem Ende
-
-    if ($startValue === null || $endValue === null) {
-        return ['row' => '', 'value' => 0, 'tariffs' => []];
-    }
-
-    // ---- 2) Verbrauch simple Differenz ----
-    $verbrauch = max(0, $endValue - $startValue);
-
-    // ---- 3) passenden Tarif suchen ----
-    $tariffPrice = 0.0;
-    foreach ($tariffs as $t) {
-        if (strtolower(trim($t['unit_type'] ?? '')) === strtolower(trim($type))) {
-            $tariffPrice = floatval($t['price']);
-            break;
+        if (!IPS_VariableExists($varId)) {
+            return ['row' => '', 'value' => 0, 'tariffs' => []];
         }
+
+        // Relevante Tarife nach Typ filtern
+        $filteredTariffs = array_filter($tariffs, fn($t) =>
+            strtolower(trim($t['unit_type'] ?? '')) === strtolower(trim($type))
+        );
+
+        $activeTariff = null;
+        foreach ($filteredTariffs as $t) {
+            $startTs = $this->toUnixTs($t['start'], false);
+            $endTs   = $this->toUnixTs($t['end'], true);
+            if ($startTs === null || $endTs === null) {
+                continue;
+            }
+            // Tarif überlappt den Abrechnungszeitraum
+            if ($endTs < $from || $startTs > $to) {
+                continue;
+            }
+            $activeTariff = [
+                'start' => $startTs,
+                'end'   => $endTs,
+                'price' => (float)$t['price']
+            ];
+            $usedTariffs[] = $activeTariff;
+            break; // erster passender Tarif reicht
+        }
+
+        $tariffPrice = $activeTariff ? $activeTariff['price'] : 0.0;
+
+        // Verbrauch = letzter Wert vor/gleich "to" minus letzter Wert vor/gleich "from"
+        $startValue = $this->GetValueAt($varId, $from, false);
+        $endValue   = $this->GetValueAt($varId, $to, false);
+
+        if ($startValue === null || $endValue === null) {
+            return ['row' => '', 'value' => 0, 'tariffs' => []];
+        }
+
+        $verbrauch = max(0, $endValue - $startValue);
+        $kosten    = round(($tariffPrice / 100) * $verbrauch, 2);
+        $totalCost = $kosten;
+
+        $rows .= "<tr>
+            <td>{$meter['name']}</td>
+            <td>{$type}</td>
+            <td align='center'>" . date('d.m.Y', $from) . "</td>
+            <td align='center'>" . date('d.m.Y', $to) . "</td>
+            <td align='right'>" . number_format($startValue, 2) . "</td>
+            <td align='right'>" . number_format($endValue, 2) . "</td>
+            <td align='right'>" . number_format($verbrauch, 2) . "</td>
+            <td align='right'>" . number_format($tariffPrice, 2) . "</td>
+            <td align='right'>" . number_format($kosten, 2) . "</td>
+        </tr>";
+
+        if ($rows === '') {
+            return ['row' => '', 'value' => 0, 'tariffs' => []];
+        }
+
+        return ['row' => $rows, 'value' => $totalCost, 'tariffs' => array_values($usedTariffs)];
     }
 
-    // ---- 4) Kosten (Rp → CHF) ----
-    $kosten = round(($tariffPrice / 100) * $verbrauch, 2);
-
-    // ---- 5) Tabellenzeile ----
-    $row = "<tr>
-        <td>{$meter['name']}</td>
-        <td>{$type}</td>
-        <td align='center'>" . date('d.m.Y', $from) . "</td>
-        <td align='center'>" . date('d.m.Y', $to) . "</td>
-        <td align='right'>" . number_format($startValue, 2) . "</td>
-        <td align='right'>" . number_format($endValue, 2) . "</td>
-        <td align='right'>" . number_format($verbrauch, 2) . "</td>
-        <td align='right'>" . number_format($tariffPrice, 2) . "</td>
-        <td align='right'>" . number_format($kosten, 2) . "</td>
-    </tr>";
-
-    return [
-        'row'     => $row,
-        'value'   => $kosten,
-        'tariffs' => [[
-            'start' => $from,
-            'end'   => $to,
-            'price' => $tariffPrice
-        ]]
-    ];
-}
-
-
     // ====================== Hilfsfunktionen ======================
 
     private function GetValueAt($varId, $timestamp, $nearestAfter = true)