diff --git a/.gitignore b/.gitignore
index 9f35ac1..e86e457 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
+# Octave
+octave-workspace
+
 # Local
 tests/results/*.xlsx
 
diff --git a/matpowercaseframes/core.py b/matpowercaseframes/core.py
index a5c74b5..d3cb37e 100644
--- a/matpowercaseframes/core.py
+++ b/matpowercaseframes/core.py
@@ -32,18 +32,11 @@ def __init__(self, data, update_index=True):
             TypeError: Error input data invalid.
         """
         # TODO: support read excel
+        # TODO: support Path object
         if isinstance(data, str):
-            # TYPE: str of path | str of matpower case name
-            if not os.path.isfile(data):
-                # TYPE: str of matpower case name
-                if MATPOWER_EXIST:
-                    data_ = os.path.join(matpower.path_matpower, f"data/{data}")
-                    if os.path.isfile(data_):
-                        data = data_
-                    else:
-                        raise FileNotFoundError
+            path = self._get_path(data)
             # TYPE: str of path
-            self._read_matpower(filepath=data)
+            self._read_matpower(filepath=path)
         elif isinstance(data, dict):
             # TYPE: dict | oct2py.io.Struct
             self._read_oct2py_struct(struct=data)
@@ -64,6 +57,30 @@ def __init__(self, data, update_index=True):
         if update_index:
             self._update_index()
 
+    @staticmethod
+    def _get_path(path):
+        # TYPE: str of path | str of matpower case name
+        if os.path.isfile(path):
+            return path
+
+        path_added_m = path + '.m'
+        if os.path.isfile(path_added_m):
+            return path_added_m
+
+        # TYPE: str of matpower case name
+        if MATPOWER_EXIST:
+            path_added_matpower = os.path.join(matpower.path_matpower, f"data/{path}")
+            if os.path.isfile(path_added_matpower):
+                return path_added_matpower
+
+            path_added_matpower_m = os.path.join(
+                matpower.path_matpower, f"data/{path_added_m}"
+            )
+            if os.path.isfile(path_added_matpower_m):
+                return path_added_matpower_m
+
+        raise FileNotFoundError
+
     def _read_matpower(self, filepath):
         # ! Old attribute is not guaranted to be replaced in re-read
         with open(filepath) as f:
@@ -259,3 +276,11 @@ def to_dict(self):
             else:
                 data[attribute] = getattr(self, attribute).values.tolist()
         return data
+
+    def to_mpc(self):
+        """
+        Convert CaseFrames into matpower-compatible data, that is dictionary
+
+        The value of the data will be in str, numeric, and list.
+        """
+        return self.to_dict()
diff --git a/notebooks/load_case16am.ipynb b/notebooks/load_case16am.ipynb
new file mode 100644
index 0000000..fafec97
--- /dev/null
+++ b/notebooks/load_case16am.ipynb
@@ -0,0 +1,701 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%load_ext autoreload\n",
+    "%autoreload 2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from matpower import start_instance\n",
+    "from matpowercaseframes import CaseFrames"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "m = start_instance()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>F_BUS</th>\n",
+       "      <th>T_BUS</th>\n",
+       "      <th>BR_R</th>\n",
+       "      <th>BR_X</th>\n",
+       "      <th>BR_B</th>\n",
+       "      <th>RATE_A</th>\n",
+       "      <th>RATE_B</th>\n",
+       "      <th>RATE_C</th>\n",
+       "      <th>TAP</th>\n",
+       "      <th>SHIFT</th>\n",
+       "      <th>BR_STATUS</th>\n",
+       "      <th>ANGMIN</th>\n",
+       "      <th>ANGMAX</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>1</td>\n",
+       "      <td>2</td>\n",
+       "      <td>0.0000</td>\n",
+       "      <td>1.000000e-08</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>2</td>\n",
+       "      <td>3</td>\n",
+       "      <td>0.1202</td>\n",
+       "      <td>1.603000e-01</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>3</td>\n",
+       "      <td>4</td>\n",
+       "      <td>0.1282</td>\n",
+       "      <td>1.763000e-01</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>3</td>\n",
+       "      <td>5</td>\n",
+       "      <td>0.1442</td>\n",
+       "      <td>2.885000e-01</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>5</th>\n",
+       "      <td>5</td>\n",
+       "      <td>6</td>\n",
+       "      <td>0.0641</td>\n",
+       "      <td>6.410000e-02</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>6</th>\n",
+       "      <td>2</td>\n",
+       "      <td>7</td>\n",
+       "      <td>0.1763</td>\n",
+       "      <td>1.763000e-01</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>7</th>\n",
+       "      <td>7</td>\n",
+       "      <td>8</td>\n",
+       "      <td>0.1282</td>\n",
+       "      <td>1.763000e-01</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>8</th>\n",
+       "      <td>7</td>\n",
+       "      <td>9</td>\n",
+       "      <td>0.1763</td>\n",
+       "      <td>1.763000e-01</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>9</th>\n",
+       "      <td>8</td>\n",
+       "      <td>10</td>\n",
+       "      <td>0.1763</td>\n",
+       "      <td>1.763000e-01</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10</th>\n",
+       "      <td>8</td>\n",
+       "      <td>11</td>\n",
+       "      <td>0.1282</td>\n",
+       "      <td>1.763000e-01</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>11</th>\n",
+       "      <td>2</td>\n",
+       "      <td>12</td>\n",
+       "      <td>0.1763</td>\n",
+       "      <td>1.763000e-01</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>12</th>\n",
+       "      <td>12</td>\n",
+       "      <td>13</td>\n",
+       "      <td>0.1442</td>\n",
+       "      <td>1.923000e-01</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>13</th>\n",
+       "      <td>12</td>\n",
+       "      <td>14</td>\n",
+       "      <td>0.1282</td>\n",
+       "      <td>1.763000e-01</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>14</th>\n",
+       "      <td>14</td>\n",
+       "      <td>15</td>\n",
+       "      <td>0.0641</td>\n",
+       "      <td>6.410000e-02</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>-360</td>\n",
+       "      <td>360</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "    F_BUS  T_BUS    BR_R          BR_X  BR_B  RATE_A  RATE_B  RATE_C  TAP  \\\n",
+       "1       1      2  0.0000  1.000000e-08     0       0       0       0    0   \n",
+       "2       2      3  0.1202  1.603000e-01     0       0       0       0    0   \n",
+       "3       3      4  0.1282  1.763000e-01     0       0       0       0    0   \n",
+       "4       3      5  0.1442  2.885000e-01     0       0       0       0    0   \n",
+       "5       5      6  0.0641  6.410000e-02     0       0       0       0    0   \n",
+       "6       2      7  0.1763  1.763000e-01     0       0       0       0    0   \n",
+       "7       7      8  0.1282  1.763000e-01     0       0       0       0    0   \n",
+       "8       7      9  0.1763  1.763000e-01     0       0       0       0    0   \n",
+       "9       8     10  0.1763  1.763000e-01     0       0       0       0    0   \n",
+       "10      8     11  0.1282  1.763000e-01     0       0       0       0    0   \n",
+       "11      2     12  0.1763  1.763000e-01     0       0       0       0    0   \n",
+       "12     12     13  0.1442  1.923000e-01     0       0       0       0    0   \n",
+       "13     12     14  0.1282  1.763000e-01     0       0       0       0    0   \n",
+       "14     14     15  0.0641  6.410000e-02     0       0       0       0    0   \n",
+       "\n",
+       "    SHIFT  BR_STATUS  ANGMIN  ANGMAX  \n",
+       "1       0          1    -360     360  \n",
+       "2       0          1    -360     360  \n",
+       "3       0          1    -360     360  \n",
+       "4       0          1    -360     360  \n",
+       "5       0          1    -360     360  \n",
+       "6       0          1    -360     360  \n",
+       "7       0          1    -360     360  \n",
+       "8       0          1    -360     360  \n",
+       "9       0          1    -360     360  \n",
+       "10      0          1    -360     360  \n",
+       "11      0          1    -360     360  \n",
+       "12      0          1    -360     360  \n",
+       "13      0          1    -360     360  \n",
+       "14      0          1    -360     360  "
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "CASE_NAME = f\"case16am.m\"\n",
+    "cf_16am = CaseFrames(CASE_NAME)\n",
+    "cf_16am.branch"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>F_BUS</th>\n",
+       "      <th>T_BUS</th>\n",
+       "      <th>BR_R</th>\n",
+       "      <th>BR_X</th>\n",
+       "      <th>BR_B</th>\n",
+       "      <th>RATE_A</th>\n",
+       "      <th>RATE_B</th>\n",
+       "      <th>RATE_C</th>\n",
+       "      <th>TAP</th>\n",
+       "      <th>SHIFT</th>\n",
+       "      <th>BR_STATUS</th>\n",
+       "      <th>ANGMIN</th>\n",
+       "      <th>ANGMAX</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>1.0</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>0.000000</td>\n",
+       "      <td>6.239253e-10</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>2.0</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>0.007500</td>\n",
+       "      <td>1.000152e-02</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>3.0</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>0.007999</td>\n",
+       "      <td>1.099980e-02</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>3.0</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>0.008997</td>\n",
+       "      <td>1.800024e-02</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>5</th>\n",
+       "      <td>5.0</td>\n",
+       "      <td>6.0</td>\n",
+       "      <td>0.003999</td>\n",
+       "      <td>3.999361e-03</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>6</th>\n",
+       "      <td>2.0</td>\n",
+       "      <td>7.0</td>\n",
+       "      <td>0.011000</td>\n",
+       "      <td>1.099980e-02</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>7</th>\n",
+       "      <td>7.0</td>\n",
+       "      <td>8.0</td>\n",
+       "      <td>0.007999</td>\n",
+       "      <td>1.099980e-02</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>8</th>\n",
+       "      <td>7.0</td>\n",
+       "      <td>9.0</td>\n",
+       "      <td>0.011000</td>\n",
+       "      <td>1.099980e-02</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>9</th>\n",
+       "      <td>8.0</td>\n",
+       "      <td>10.0</td>\n",
+       "      <td>0.011000</td>\n",
+       "      <td>1.099980e-02</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10</th>\n",
+       "      <td>8.0</td>\n",
+       "      <td>11.0</td>\n",
+       "      <td>0.007999</td>\n",
+       "      <td>1.099980e-02</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>11</th>\n",
+       "      <td>2.0</td>\n",
+       "      <td>12.0</td>\n",
+       "      <td>0.011000</td>\n",
+       "      <td>1.099980e-02</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>12</th>\n",
+       "      <td>12.0</td>\n",
+       "      <td>13.0</td>\n",
+       "      <td>0.008997</td>\n",
+       "      <td>1.199808e-02</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>13</th>\n",
+       "      <td>12.0</td>\n",
+       "      <td>14.0</td>\n",
+       "      <td>0.007999</td>\n",
+       "      <td>1.099980e-02</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>14</th>\n",
+       "      <td>14.0</td>\n",
+       "      <td>15.0</td>\n",
+       "      <td>0.003999</td>\n",
+       "      <td>3.999361e-03</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>-360.0</td>\n",
+       "      <td>360.0</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "    F_BUS  T_BUS      BR_R          BR_X  BR_B  RATE_A  RATE_B  RATE_C  TAP  \\\n",
+       "1     1.0    2.0  0.000000  6.239253e-10   0.0     0.0     0.0     0.0  0.0   \n",
+       "2     2.0    3.0  0.007500  1.000152e-02   0.0     0.0     0.0     0.0  0.0   \n",
+       "3     3.0    4.0  0.007999  1.099980e-02   0.0     0.0     0.0     0.0  0.0   \n",
+       "4     3.0    5.0  0.008997  1.800024e-02   0.0     0.0     0.0     0.0  0.0   \n",
+       "5     5.0    6.0  0.003999  3.999361e-03   0.0     0.0     0.0     0.0  0.0   \n",
+       "6     2.0    7.0  0.011000  1.099980e-02   0.0     0.0     0.0     0.0  0.0   \n",
+       "7     7.0    8.0  0.007999  1.099980e-02   0.0     0.0     0.0     0.0  0.0   \n",
+       "8     7.0    9.0  0.011000  1.099980e-02   0.0     0.0     0.0     0.0  0.0   \n",
+       "9     8.0   10.0  0.011000  1.099980e-02   0.0     0.0     0.0     0.0  0.0   \n",
+       "10    8.0   11.0  0.007999  1.099980e-02   0.0     0.0     0.0     0.0  0.0   \n",
+       "11    2.0   12.0  0.011000  1.099980e-02   0.0     0.0     0.0     0.0  0.0   \n",
+       "12   12.0   13.0  0.008997  1.199808e-02   0.0     0.0     0.0     0.0  0.0   \n",
+       "13   12.0   14.0  0.007999  1.099980e-02   0.0     0.0     0.0     0.0  0.0   \n",
+       "14   14.0   15.0  0.003999  3.999361e-03   0.0     0.0     0.0     0.0  0.0   \n",
+       "\n",
+       "    SHIFT  BR_STATUS  ANGMIN  ANGMAX  \n",
+       "1     0.0        1.0  -360.0   360.0  \n",
+       "2     0.0        1.0  -360.0   360.0  \n",
+       "3     0.0        1.0  -360.0   360.0  \n",
+       "4     0.0        1.0  -360.0   360.0  \n",
+       "5     0.0        1.0  -360.0   360.0  \n",
+       "6     0.0        1.0  -360.0   360.0  \n",
+       "7     0.0        1.0  -360.0   360.0  \n",
+       "8     0.0        1.0  -360.0   360.0  \n",
+       "9     0.0        1.0  -360.0   360.0  \n",
+       "10    0.0        1.0  -360.0   360.0  \n",
+       "11    0.0        1.0  -360.0   360.0  \n",
+       "12    0.0        1.0  -360.0   360.0  \n",
+       "13    0.0        1.0  -360.0   360.0  \n",
+       "14    0.0        1.0  -360.0   360.0  "
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "CASE_NAME = f\"case16am.m\"\n",
+    "mpc = m.loadcase(CASE_NAME)\n",
+    "cf_16am = CaseFrames(mpc)\n",
+    "cf_16am.branch"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# m.exit()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "env",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.12.3"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 6931ebf..c57f1e5 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -3,8 +3,8 @@ numpy>=1.21.5
 
 openpyxl>=3.1.2
 
-oct2py>=5.5.1
-matpower>=7.1.0.2.1.4
+oct2py>=5.7.0
+matpower>=7.1.0.2.1.8
 
 pytest
 pytest-cov
diff --git a/tests/test_read_matpower_cases.py b/tests/test_read_matpower_cases.py
index 0746a16..64bb115 100644
--- a/tests/test_read_matpower_cases.py
+++ b/tests/test_read_matpower_cases.py
@@ -1,4 +1,4 @@
-from matpower import path_matpower
+from matpower import path_matpower, start_instance
 
 from matpowercaseframes import CaseFrames
 
@@ -25,3 +25,20 @@ def test_case118():
 def test_t_case9_dcline():
     CASE_NAME = f"{path_matpower}/lib/t/t_case9_dcline.m"
     CaseFrames(CASE_NAME)
+
+
+def test_loadcase_case16am():
+    m = start_instance()
+    CASE_NAME = f"case16am.m"
+    mpc = m.loadcase(CASE_NAME)
+    CaseFrames(mpc)
+    m.exit()
+
+def test_read_without_ext():
+    CASE_NAME = 'case9'
+    cf = CaseFrames(CASE_NAME)
+
+    CASE_NAME = 'case9.m'
+    cf_ext = CaseFrames(CASE_NAME)
+
+    assert True