Method of determining emission level for carbon dioxide
4.—(1)  The emission level from a vehicle for carbon dioxide is determined in accordance with this rule.
(2)  For any vehicle excluding an electric vehicle or a plug‑in hybrid electric vehicle, but including a conventional hybrid electric vehicle, the emission level is the amount —
(a)measured in accordance with the provisions of UNECE Regulation No. 101, EC Directive 80/1268/EEC, Annex I of Commission Regulation (EU) No. 2017/1153, Commission Regulation (EU) No. 2017/1151 or WLTP Japan; and
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(b)submitted to the Registrar under section 41(a)(ii) of the Energy Conservation Act (Cap. 92C).
(3)  For an electric vehicle or a plug‑in hybrid electric vehicle (excluding a conventional hybrid electric vehicle) the emission level is A + (B × C) where —
(a)A is the weighted carbon dioxide emission data for the vehicle —
(i)that is —
(A)for electric vehicles, zero; and
(B)for plug‑in hybrid electric vehicles, measured in accordance with the provisions of UNECE Regulation No. 101, EC Directive 80/1268/EEC, Annex I of Commission Regulation (EU) No. 2017/1153, Commission Regulation (EU) No. 2017/1151 or WLTP Japan; and
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(ii)submitted to the Registrar under section 41(a)(ii) of the Energy Conservation Act;
(b)B is the weighted electric energy consumption data —
(i)measured in accordance with the provisions of UNECE Regulation No. 101, EC Directive 80/1268/EEC, Commission Regulation (EU) No. 2017/1151 or WLTP Japan; and
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(ii)submitted to the Registrar under section 41(a)(ii) of the Energy Conservation Act; and
(c)C is an emission factor of 0.4 grams of carbon dioxide per watt‑hour.