diff --git a/definitions/variable/energy/primary-energy.yaml b/definitions/variable/energy/primary-energy.yaml
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+- Primary Energy|Biomass|Electricity:
+    description: Primary energy input of biomass for electricity generation
+    unit: EJ/yr
+    tier: 2
+- Primary Energy|Biomass|Electricity|{CCS}:
+    description: Primary energy input of biomass for electricity generation {CCS}
+    unit: EJ/yr
+    tier: 2
+- Primary Energy|Biomass|{Secondary Fuel Level 1}:
+    description: Primary energy input of biomass for conversion to {Secondary Fuel Level 1}
+    unit: EJ/yr
+    tier: 2
+- Primary Energy|Biomass|{Secondary Fuel Level 1}|{CCS}:
+    description: Primary energy input of biomass for conversion to {Secondary Fuel Level 1} {CCS}
+    unit: EJ/yr
+    tier: 3
+
+- Primary Energy|Non-Biomass Renewables:
+    description: Primary energy consumption of renewable energy exluding biomass
+    unit: EJ/yr
+    tier: 1
+- Primary Energy|{Primary Non-Biomass Renewables}:
+    description: Primary energy consumption of {Primary Non-Biomass Renewables}
+    unit: EJ/yr
+    tier: 1
+
+- Primary Energy|Nuclear:
+    description: Primary energy consumption of nuclear power (direct equivalent),
+      includes electricity, heat and hydrogen production from nuclear energy)
+    unit: EJ/yr
+    tier: 1
+
+- Primary Energy|{Primary Fossil Fuel}:
+    description: Primary energy consumption of {Primary Fossil Fuel}
+    unit: EJ/yr
+    tier: 1
+- Primary Energy|{Primary Fossil Fuel}|{CCS}:
+    description: Primary energy consumption of {Primary Fossil Fuel} {CCS}
+    unit: EJ/yr
+    tier: 2
+- Primary Energy|{Primary Fossil Fuel}|Electricity:
+    description: Primary energy consumption of {Primary Fossil Fuel}
+      for electricity generation
+    unit: EJ/yr
+    tier: 2
+- Primary Energy|{Primary Fossil Fuel}|Electricity|{CCS}:
+    description: Primary energy consumption of {Primary Fossil Fuel}
+      for electricity generation {CCS}
+    unit: EJ/yr
+    tier: 2
+- Primary Energy|{Primary Fossil Fuel}|{Secondary Fuel Level 1}:
+    description: Primary energy consumption of {Primary Fossil Fuel}
+      for conversion to {Secondary Fuel Level 1}
+    unit: EJ/yr
+    tier: 2
+- Primary Energy|{Primary Fossil Fuel}|{Secondary Fuel Level 1}|{CCS}:
+    description: Primary energy consumption of {Primary Fossil Fuel} for
+      conversion to {Secondary Fuel Level 1} {CCS}
+    unit: EJ/yr
+    tier: 3
+
+- Primary Energy|Secondary Energy Trade:
+    description: Primary energy consumption from trade in secondary energy carriers that
+      cannot be unambiguoulsy mapped to one of the existing primary energy categories,
+      e.g. electricity, hydrogen
+    notes: Negative values indicate net exports of an energy carrier
+    unit: EJ/yr
+    tier: 3
+
+- Primary Energy|Other:
+    description: Primary energy consumption from sources that do not fit any other
+      category (direct equivalent)
+    unit: EJ/yr
+    tier: 1
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