diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index 7f268796..adfffdf2 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -3618,6 +3618,36 @@ _ELMHURST_GAS_BOILER_FUEL_TYPES: frozenset[str] = frozenset({
     "LPG special condition",
 })
 
+# Standard-electricity Table 32 fuel code. SAP 10.2 Table 12 lists
+# this as code 30 = "Electricity, standard tariff" — the fuel-cost /
+# CO2 / PE lookup key for any electric main heating system.
+_STANDARD_ELECTRICITY_FUEL_CODE: Final[int] = 30
+
+# SAP 10.2 Table 4a main-heating SAP codes whose fuel is electricity.
+# Elmhurst §14.0 leaves "Fuel Type" empty for these systems (the SAP
+# code identifies the carrier), so the mapper must infer the fuel
+# from the SAP code rather than the empty string. First needed by
+# cert 000565 Main 1 (SAP code 224 = "Air source heat pump, 2013 or
+# later") — without inference, `_main_fuel_code` returns None and the
+# Table 32 price lookup defaults to mains gas, charging the HP cert's
+# electricity kWh at the gas tariff.
+#
+# Coverage as Elmhurst-only fixtures land:
+#   191-196 — electric boilers (Table 4a "Electric boilers" rows)
+#   211-217, 221-227 — heat pumps (Table 4a "Heat pumps" rows; 224 is
+#       the ASHP 2013+ entry, 1.70 COP — `sap_efficiencies.py:44`)
+#   401-409 — electric storage heaters (Table 4a "Storage heaters")
+#   421-425 — electric underfloor (Table 4a "Underfloor heating")
+#   521-527 — warm-air heat pumps (Table 4a "Warm-air heat pumps")
+_ELECTRIC_SAP_MAIN_HEATING_CODES: Final[frozenset[int]] = frozenset(
+    list(range(191, 197))
+    + list(range(211, 218))
+    + list(range(221, 228))
+    + list(range(401, 410))
+    + list(range(421, 426))
+    + list(range(521, 528))
+)
+
 
 class UnmappedElmhurstLabel(ValueError):
     """An Elmhurst Summary lodged a finite-enum label that the mapper
@@ -3835,6 +3865,13 @@ def _map_elmhurst_main_heating_2(
             ),
         )
     main_fuel_int = _elmhurst_main_fuel_int(mh2.fuel_type)
+    # Same electric-SAP-code fuel inference as Main 1 — see
+    # `_ELECTRIC_SAP_MAIN_HEATING_CODES` docstring.
+    if (
+        main_fuel_int is None
+        and mh2.main_heating_sap_code in _ELECTRIC_SAP_MAIN_HEATING_CODES
+    ):
+        main_fuel_int = _STANDARD_ELECTRICITY_FUEL_CODE
     category: Optional[int] = None
     if pcdb_index is not None and heat_pump_record(pcdb_index) is not None:
         category = _ELMHURST_HEATING_CATEGORY_HEAT_PUMP
@@ -3882,6 +3919,15 @@ def _map_elmhurst_sap_heating(survey: ElmhurstSiteNotes) -> SapHeating:
     )
     pcdb_index = _elmhurst_pcdb_boiler_index(mh.pcdf_boiler_reference)
     main_fuel_int = _elmhurst_main_fuel_int(mh.fuel_type)
+    # Elmhurst §14.0 leaves "Fuel Type" empty for electric main heating
+    # systems (HP / electric boiler / storage / underfloor); the SAP
+    # code identifies the carrier. Infer electricity (Table 32 code 30)
+    # when the mapper can't read it from the `fuel_type` string.
+    if (
+        main_fuel_int is None
+        and mh.main_heating_sap_code in _ELECTRIC_SAP_MAIN_HEATING_CODES
+    ):
+        main_fuel_int = _STANDARD_ELECTRICITY_FUEL_CODE
     heat_emitter_int = _elmhurst_heat_emitter_int(mh.heat_emitter)
     sap_control_int = _elmhurst_sap_control_code(sap_control)
     main_heating_category = _elmhurst_main_heating_category(mh, pcdb_index)