The new electric buses will offer longer operating ranges, a passenger information display system, and safety systems to assist bus captains, among others.
The Land Transport Authority has called for a tender to purchase 100 three-door buses, which will be deployed in 2020.
The winner of the tender will operate the buses for five years with a possibility of a two-year extension for good performance.
Among the bidders for the Seletar bus package tender which closed noon yesterday, were Singapore's Woodlands Transport and National Express from the U.K.
The tender for the third Government bus contract - named the Seletar package - was called yesterday, attracting interest from several companies and consortiums.
The Land Transport Authority called a tender for the third Government bus contract - called the Seletar package - to run 26 bus routes.
Tower Transit's first nine services have hit the roads and the third bus operator is likely to bid in the next tender, likely in June, to run more routes.
London-based Tower Transit beat seven other firms including local players SBS Transit and SMRT Buses to win the inaugural government bus contract.
LTA has called a design tender for public buses that requires companies to consider factors such as comfort, safety and carrying capacity during peak hours.
A second tender to operate bus services under the government contracting model was called by the Land Transport Authority yesterday.
The Land Transport Authority has called for a tender to invite private bus operators to submit their cost proposals to operate five City Direct bus services.
The first public bus contract by the Land Transport Authority (LTA) has drawn a total of 11 bidders and the winner will be announced in April.
The Land Transport Authority has called tender for operators to run the first public bus route package for five years, starting from 2016.
The Land Transport Authority has called a tender for six short feeder bus services to be run by private transport operators.
Commuters in Choa Chu Kang, Pasir Ris and Tampines will benefit from five new feeder bus services from the third quarter of 2014.