Porsche's working on a plug-in hybrid-electric (PHEV) powertrain for both its Cayenne and Panamera models, Motor Trend reports. The Cayenne SUV PHEV will likely debut in 2014, followed shortly by the Panamera, according to the publication. We've heard about the Panamera PHEV before, and that there would be a Cayenne PHEV as well isn't exactly a surprise.

The powertrain will include an electric motor that delivers as much as 100 horsepower and a combined 420 horsepower with its V6 gas engine. Electric-only range will likely be more than 15 miles. Also in store is a V8 twin-turbodiesel Cayenne for the US market. Porsche is also working on a plug-in hybrid powertrain for the 918.

Currently, Porsche sells a small number of Cayenne and Panamera Hybrids in the US, with sales of just 1,445 units, combined, through October.

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