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    EPCA–Sigma Powertrain Cat 793 retrofit: decarbonisation lessons for mine fleets

    August 14, 2026|

    Reviewed by Joe Ashwell

    EPCA–Sigma Powertrain Cat 793 retrofit: decarbonisation lessons for mine fleets

    First reported on International Mining – News

    30 Second Briefing

    Electric Power Conversions Australia, Sigma Powertrain and Dayton-Phoenix Group are set to retrofit a Caterpillar 793C mechanical-drive haul truck from Northern Star Resources’ KCGM Operations in Western Australia into a 100% battery-electric unit. The project will replace the diesel engine and mechanical drive with a fully electric drivetrain and high-voltage battery system, effectively creating a zero-exhaust-emission version of a 220–240 t class truck. For mine operators, the retrofit approach offers a potential pathway to decarbonise large fleets without purchasing new OEM battery-electric models.

    Technical Brief

    • Conversion targets a mechanically driven Cat 793C at end-of-life, avoiding modification of newer assets.
    • Using an end-of-life chassis allows structural reuse while writing off the original diesel powertrain.
    • Success would offer a reference case for retrofitting other mechanical-drive ultra-class fleets globally.

    Our Take

    With China’s mining truck battery conversion boom already involving EPCA and Caterpillar in a separate E-777 programme, a Cat 793 retrofit in Western Australia positions Australian engineering firms to compete technically with Chinese retrofit suppliers on ultra‑class haulage.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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