BYD says it has now manufactured 50,000 pure electric buses, nine years since production began.
The milestone follows the departure of a K9UB 12-metre pure electric bus for Spain from BYD's Hangzhou testing facility.
As Spain's largest 12-metre pure electric bus, the vehicle will be operated by local operator, TUBASA and is expected to enter service in Badajoz, a city in South West Spain this spring.
BYD entered Spain's electric bus sector in 2017 and currently has orders from various cities such as Valencia, Saint Cugat, Badalona and Badajoz. To date, BYD is the only Chinese company to enter the Spanish electric bus market successfully.
"Our track record demonstrates a clear market recognition of and trust in BYD products," said BYD president and chairman, Wang Chuanfu.
"BYD has set a standard for the pure electric bus market because of its quality, complete supply chain and product solutions and core technologies in areas such as batteries, motors and electronic controls."
In 2010, BYD proposed its 'Public Transportation Electrification' strategy. With Shenzhen's hosting of the 26th Summer Universiade in 2011, 200 BYD K9 pure electric buses entered operations in the city. The event saw BYD become the world's first company to commercialise new energy buses.
BYD pure electric buses are in major Chinese cities such as Beijing, Guangzhou, Shenzhen, Tianjin, Hangzhou, Nanjing, Changsha and Xian, but also medium-to-small sized cities in the country.
In addition, BYD has also gradually grown its international customer base for pure electric buses since the first batch of 35 electric vehicles was exported to Amsterdam Schiphol airport in 2013.
These include Transport for London, Los Angeles Public Transport, Sydney Airport, Stanford University and Facebook.
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