Status report on the EV/HFCV Retrofit Systems IWG activities. The group held six meetings since the last GRPE session and is currently focused on the EV part, with HFCV-specific issues deferred to a future series of amendments. Key discussion items include scope definition with agreement to exclude vehicles holding approvals according to UN R155 and UN R156, definition of Electric Powertrain Retrofit System, vehicle family notion, and type of EPRS. Experts from different GRs participate in discussions on electrical safety, EMC, braking, cybersecurity, and power determination. Benchmarking of existing national requirements for EV retrofit activities is ongoing. Regulation drafting continues on scope and type definition, with demonstrations of retrofitted vehicles expected at the 200th WP.29 session in November 2026.