California wants to turbocharge electric trucking by offering a $398-million round of incentive funding for buyers of the green vehicles.

It’s part of the state’s plan to promote technologies that can reduce the harmful effects of diesel emissions.

Such incentives are expected to encourage the purchase of electric trucks and powertrains like those that Tesla Inc., Cummins Inc., BYD Inc. and Mitsubishi Fuso are planning or are already selling. Electric heavy-duty trucks typically sell for 20 percent to 30 percent more than comparable diesel vehicles. The incentives will help offset the difference.

The funding also will underwrite sales of clean natural gas trucks and other green technologies.

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