diff --git a/tutorial/westeros/_static/historical_new_capacity_and_total_installed_capacity.png b/tutorial/westeros/_static/historical_new_capacity_and_total_installed_capacity.png
index 19c0f0911..07f9561bb 100644
Binary files a/tutorial/westeros/_static/historical_new_capacity_and_total_installed_capacity.png and b/tutorial/westeros/_static/historical_new_capacity_and_total_installed_capacity.png differ
diff --git a/tutorial/westeros/_static/historical_new_capacity_and_total_installed_capacity.pptx b/tutorial/westeros/_static/historical_new_capacity_and_total_installed_capacity.pptx
index b9a81d8ec..a7dc69b1a 100644
Binary files a/tutorial/westeros/_static/historical_new_capacity_and_total_installed_capacity.pptx and b/tutorial/westeros/_static/historical_new_capacity_and_total_installed_capacity.pptx differ
diff --git a/tutorial/westeros/westeros_firm_capacity.ipynb b/tutorial/westeros/westeros_firm_capacity.ipynb
index b35f974dd..0ba839599 100644
--- a/tutorial/westeros/westeros_firm_capacity.ipynb
+++ b/tutorial/westeros/westeros_firm_capacity.ipynb
@@ -70,8 +70,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "year_df = scen.vintage_and_active_years()\n",
-    "vintage_years, act_years = year_df[\"year_vtg\"], year_df[\"year_act\"]\n",
     "model_horizon = scen.set(\"year\")\n",
     "country = \"Westeros\""
    ]
@@ -387,7 +385,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "message_ix",
+   "display_name": "mix312",
    "language": "python",
    "name": "python3"
   },
@@ -402,11 +400,6 @@
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
    "version": "3.12.3"
-  },
-  "vscode": {
-   "interpreter": {
-    "hash": "29605b568787f5559ca1ba05da75d155c3dcfa15a1a63b1885b057c5465ade2e"
-   }
   }
  },
  "nbformat": 4,
diff --git a/tutorial/westeros/westeros_fossil_resource.ipynb b/tutorial/westeros/westeros_fossil_resource.ipynb
index a4d1a1997..f24484693 100644
--- a/tutorial/westeros/westeros_fossil_resource.ipynb
+++ b/tutorial/westeros/westeros_fossil_resource.ipynb
@@ -128,11 +128,12 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "country = \"Westeros\"\n",
+    "\n",
     "# Retrieving model period information\n",
-    "year_df = scen.vintage_and_active_years()\n",
+    "year_df = scen.vintage_and_active_years((country, \"coal_ppl\"), in_horizon=False)\n",
     "vintage_years, act_years = year_df[\"year_vtg\"], year_df[\"year_act\"]\n",
-    "model_horizon = scen.set(\"year\")\n",
-    "country = \"Westeros\""
+    "model_horizon = scen.set(\"year\")"
    ]
   },
   {
@@ -491,7 +492,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "message_ix",
+   "display_name": "mix312",
    "language": "python",
    "name": "python3"
   },
@@ -506,11 +507,6 @@
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
    "version": "3.12.3"
-  },
-  "vscode": {
-   "interpreter": {
-    "hash": "29605b568787f5559ca1ba05da75d155c3dcfa15a1a63b1885b057c5465ade2e"
-   }
   }
  },
  "nbformat": 4,
diff --git a/tutorial/westeros/westeros_historical_new_capacity.ipynb b/tutorial/westeros/westeros_historical_new_capacity.ipynb
index 7903b08f3..665cd8b5c 100644
--- a/tutorial/westeros/westeros_historical_new_capacity.ipynb
+++ b/tutorial/westeros/westeros_historical_new_capacity.ipynb
@@ -225,7 +225,7 @@
    "outputs": [],
    "source": [
     "df = scenario.par(\"demand\")\n",
-    "df[\"value\"] = float(df[df[\"year\"] == 700][\"value\"])\n",
+    "df[\"value\"] = float(df.loc[df[\"year\"] == 700, \"value\"].iloc[0])\n",
     "scenario.add_par(\"demand\", df)\n",
     "df"
    ]
@@ -279,7 +279,7 @@
     "# We will hence start by retrieving the demand in the `firstmodelyear`,\n",
     "# and assume this also applies for historic time-periods.\n",
     "demand_of_firstmodelyear = float(\n",
-    "    scenario.par(\"demand\", filters={\"year\": scenario.firstmodelyear})[\"value\"]\n",
+    "    scenario.par(\"demand\", filters={\"year\": scenario.firstmodelyear})[\"value\"].iloc[0]\n",
     ")\n",
     "print(f\"The demand of the `firstmodelyear` is {demand_of_firstmodelyear} GWa.\")"
    ]
@@ -292,15 +292,15 @@
    "source": [
     "# We know that there are losses that occur when electricity is transmitted via the\n",
     "# `grid`.\n",
-    "grid_eff = float(\n",
+    "grid_eff = 1 / float(\n",
     "    scenario.par(\n",
-    "        \"output\",\n",
+    "        \"input\",\n",
     "        filters={\n",
     "            \"year_vtg\": scenario.firstmodelyear,\n",
     "            \"year_act\": scenario.firstmodelyear,\n",
     "            \"technology\": \"grid\",\n",
     "        },\n",
-    "    )[\"value\"]\n",
+    "    )[\"value\"].iloc[0]\n",
     ")\n",
     "print(f\"Grid efficiency is {grid_eff}.\")\n",
     "demand_of_firstmodelyear /= grid_eff"
@@ -313,7 +313,7 @@
    "outputs": [],
    "source": [
     "duration_period = float(\n",
-    "    scenario.par(\"duration_period\", filters={\"year\": history})[\"value\"]\n",
+    "    scenario.par(\"duration_period\", filters={\"year\": history})[\"value\"].iloc[0]\n",
     ")\n",
     "print(f\"The duration of the period is {duration_period} years.\")\n",
     "historical_new_capacity = demand_of_firstmodelyear / duration_period"
@@ -323,7 +323,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Each year within the historical 10 year period, a 11.11 GW `\"coal_ppl\"` must be added to meet the demand of the `firstmodelyear`. Therefore, the value of `\"historical_new_capacity\"` is calculated to `\"historical_new_capacity\" = demand_of_firstmodelyear / \"duration_period\"`."
+    "Each year within the historical 10 year period, a 6.11 GW `\"coal_ppl\"` must be added to meet the demand of the `firstmodelyear`. Therefore, the value of `\"historical_new_capacity\"` is calculated to `\"historical_new_capacity\" = demand_of_firstmodelyear / \"duration_period\"`."
    ]
   },
   {
@@ -344,7 +344,7 @@
     ")\n",
     "print(\n",
     "    \"The `'historical_new_capacity'` for `coal_ppl` is set to \"\n",
-    "    f\"{round(historical_new_capacity, 2)}\"\n",
+    "    f\"{round(historical_new_capacity, 2)} {df[\"unit\"].values}.\"\n",
     ")\n",
     "scenario.add_par(\"historical_new_capacity\", df)"
    ]
@@ -844,12 +844,16 @@
     "\n",
     "# Retrieve `\"historical_new_capacity\"`\n",
     "value = float(\n",
-    "    scenario2.par(\"historical_new_capacity\", filters={\"technology\": \"coal_ppl\"}).value\n",
+    "    scenario2.par(\n",
+    "        \"historical_new_capacity\", filters={\"technology\": \"coal_ppl\"}\n",
+    "    ).value.iloc[0]\n",
     ")\n",
     "\n",
     "# Retrieve `\"duration_period\"` for the year 700\n",
     "duration_period = float(\n",
-    "    scenario.par(\"duration_period\", filters={\"year\": scenario.firstmodelyear})[\"value\"]\n",
+    "    scenario.par(\"duration_period\", filters={\"year\": scenario.firstmodelyear})[\n",
+    "        \"value\"\n",
+    "    ].iloc[0]\n",
     ")\n",
     "\n",
     "value *= duration_period\n",
@@ -976,12 +980,16 @@
    "source": [
     "# Retrieve `historical_new_capacity`\n",
     "value = float(\n",
-    "    scenario2.par(\"historical_new_capacity\", filters={\"technology\": \"coal_ppl\"}).value\n",
+    "    scenario2.par(\n",
+    "        \"historical_new_capacity\", filters={\"technology\": \"coal_ppl\"}\n",
+    "    ).value.iloc[0]\n",
     ")\n",
     "\n",
     "# Retrieve `duration_period` for the year 700\n",
     "duration_period = float(\n",
-    "    scenario.par(\"duration_period\", filters={\"year\": scenario.firstmodelyear})[\"value\"]\n",
+    "    scenario.par(\"duration_period\", filters={\"year\": scenario.firstmodelyear})[\n",
+    "        \"value\"\n",
+    "    ].iloc[0]\n",
     ")\n",
     "\n",
     "value *= duration_period\n",
@@ -1106,7 +1114,7 @@
  "metadata": {
   "anaconda-cloud": {},
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "mix312",
    "language": "python",
    "name": "python3"
   },
diff --git a/tutorial/westeros/westeros_renewable_resource.ipynb b/tutorial/westeros/westeros_renewable_resource.ipynb
index 2fecc7d07..dcd7007bb 100644
--- a/tutorial/westeros/westeros_renewable_resource.ipynb
+++ b/tutorial/westeros/westeros_renewable_resource.ipynb
@@ -76,10 +76,10 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "year_df = scen.vintage_and_active_years()\n",
+    "country = \"Westeros\"\n",
+    "year_df = scen.vintage_and_active_years((country, \"wind_ppl\"), in_horizon=False)\n",
     "vintage_years, act_years = year_df[\"year_vtg\"], year_df[\"year_act\"]\n",
-    "model_horizon = scen.set(\"year\")\n",
-    "country = \"Westeros\""
+    "model_horizon = scen.set(\"year\")"
    ]
   },
   {
@@ -517,7 +517,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "message_ix",
+   "display_name": "mix312",
    "language": "python",
    "name": "python3"
   },
@@ -532,11 +532,6 @@
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
    "version": "3.12.3"
-  },
-  "vscode": {
-   "interpreter": {
-    "hash": "29605b568787f5559ca1ba05da75d155c3dcfa15a1a63b1885b057c5465ade2e"
-   }
   }
  },
  "nbformat": 4,
diff --git a/tutorial/westeros/westeros_share_constraint.ipynb b/tutorial/westeros/westeros_share_constraint.ipynb
index 9c3a4b3ab..85af975e6 100644
--- a/tutorial/westeros/westeros_share_constraint.ipynb
+++ b/tutorial/westeros/westeros_share_constraint.ipynb
@@ -81,9 +81,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "year_df = scen.vintage_and_active_years()\n",
-    "vintage_years, act_years = year_df[\"year_vtg\"], year_df[\"year_act\"]\n",
-    "model_horizon = scen.set(\"year\")\n",
     "country = \"Westeros\""
    ]
   },
@@ -472,7 +469,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "mix312",
    "language": "python",
    "name": "python3"
   },