While the technology for plug-ins has developed rapidly, lowering costs, Uchiyamada said he had "no idea" exactly when plug-in sales would hit the 1 million mark.
Toyota launched its first hybrid model, the Coaster Hybrid EV microbus, in August 1997.
Toyota last crossed a million-level milestone back in May 2016.
"Hybrids remain an important part of our lineup of vehicles, with over 246,000 units sold past year, and we have seen continued demand with the release of the RAV4 Hybrid variant of the popular compact SUV, accounting for almost 13 percent of its total sales volume in 2016", notes Toyota NA exec Bob Carter. Uchiyamada added that he wasn't sure when plug-ins would reach 1 million in sales. Powered by the Hybrid Synergy Drive system, the new Prius delivers a claimed efficiency of 26.27kmpl.
With Toyota hybrid units gaining a new level of acceptance and popularity, the automaker estimates that it has contributed to approximately 77 million fewer tons of Carbon dioxide emissions and has saved approximately 29 million kiloliters of gasoline.
In the spring, Toyota will introduce a hybrid model to its Lexus luxury brand.
The fourth-generation Prius - launched in 2016 as the first vehicle built on the Toyota New Global Architecture (TNGA) platform - also incorporated engaging dynamics for customers wanting to purchase a auto that is fun to drive.
Toyota looks beyond this feat and revels in the ability of a technology they pioneered to become a 'mainstream solution to reduce greenhouse gas emissions and other pollutants'.
Toyota (TM) announces today that it recorded more than 10M cumulative sales of hybrid vehicles (including plug-in hybrids) as of January 31.
Toyota positions PHVs as the core vehicle segment in the company's Toyota Environmental Challenge 2050―where the goal is to achieve a society in which cars, people and the environment co-exist harmoniously - and plans to continue strengthening this product line.