The transport sector needs to become sustainable and public transport has an important role to play. Green public procurement has proven to have great potential to influence the transition to a sustainable public transport sector. Sweden is a good example of a country that uses public procurement in the public transport sector to a large extent and has at the same time come far in the transition to renewable fuel. The aim of this study is to examine what role public transport authorities (PTAs) can have in supporting more environmentally sustainable public transport through public procurement. This was done by a content analysis regarding the expressions of environmental requirements historically, over a ten-year period, in tender documents in Sweden, followed by a workshop where the implications of the findings and future tender processes were discussed with relevant actors. The results showed that all the environmental requirements have become stricter during the studied period, but indicate a tendency for higher use of environmental requirements in tendering of larger areas as well as in tendering of public transport within cities. Specifically, for requirements for fuel, the same tenders also use specific requirements to a higher extent. However, the subsequent workshop discussions indicated that the use of specific requirements is one reason for disagreement among involved actors. Overall, this study of the Swedish public transport case showed that PTAs have a large potential to support more environmentally sustainable solutions using environmental requirements in public procurement.

交通部门需要变得可持续，公共交通可以发挥重要作用。事实证明，绿色公共采购在影响向可持续公共交通部门的过渡方面具有巨大潜力。瑞典是一个在公共交通部门大量使用公共采购的国家，同时在向可再生燃料过渡方面取得了很大进展。本研究的目的是研究公共交通当局 (PTA) 在通过公共采购支持更具环境可持续性的公共交通方面可以发挥什么作用。这是通过对瑞典招标文件中过去十年的环境要求表述的内容分析完成的，随后举行了研讨会，与相关参与者讨论了调查结果和未来招标过程的影响。结果表明，在研究期间，所有的环境要求都变得更加严格，但表明在更大区域的招标以及城市内的公共交通招标中，环境要求的使用率更高。具体而言，对于燃料的要求，同一标书也更多地采用了具体要求。然而，随后的研讨会讨论表明，特定要求的使用是相关参与者之间存在分歧的原因之一。总体而言，这项对瑞典公共交通案例的研究表明，PTA 在公共采购中利用环境要求支持更具环境可持续性的解决方案方面具有巨大潜力。