July 15, 2020. MZA opened a tender for the supply of 160 buses powered by compressed natural gas (CNG) and liquefied natural gas (LNG). In total, four entities request the order divided into two parts. The cheapest offers were made by Solaris and Autosan, respectively. The latter company offers vehicles with a Solbus license.

The order is divided into two: first, it applies to CNG buses (40 standard-length buses and 30 articulated ones); and the second are 90 buses that run on LNG, all of which must be articulated.

Buses must be delivered on specific dates. CNG units articulated within 36 weeks after signing the contract, but not before April 30, 2021. CNG vehicles of standard length within 40 weeks after signing the agreement, but not before May 28, 2021. In the case of LNG buses, 5 units (of a total of 10) will be delivered within 80 weeks after the signing of the agreement, but not before December 3 and 10, 2021, and as of January 14, 2022, the remaining 80 vehicles.

Likewise, MZA foresees a change in the contract in terms of increasing the number of buses covered by it. By the end of 2021, an additional 30 CNG articulated vehicles (of the same type and price) would be delivered.