BV X had a DBFM agreement with the Ministry of Infrastructure and Water Management for the construction and maintenance of the HSL-Zuid.BV X invoiced availability fees including VAT to the ministry.The availability fees were compensation for the extent to which the HSL-Zuid was available for use.The amount of the availability fee was determined, among other factors, by the financing of the construction of the HSL-Zuid.
Source: futd.nl
Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.