"Going forward our electric cars will be the hallmark of Volkswagen," he told reporters at the VW group's Wolfsburg headquarters in northern Germany.
The switch to electric will be funded through new investments and economies of scale, Diess said, and is a crucial part of the troubled brand's efforts to reinvent itself.
Volkswagen on Friday already announced the biggest revamp in its history, saying that it would cut 30,000 jobs to save 3.7 billion euros ($3.9 billion) a year by 2020, while ramping up investment in future technologies such as electric cars, self-driving cars and digitalisation.
"Our industry will undergo more fundamental change over the next 10 years than ever before," Diess said, predicting that "the breakthrough" of electric cars was just four or five years away and would be driven by environmental concerns.
"For most customers the electric car will soon be the better alternative," he said.