Ermittlung von Entgelten und Abschlägen eines Public Private Partnership (PPP)-Modells auf Verfügbarkeitsbasis für Autobahnen

  • Calculation of payments and reductions of these payments of an availability-based Public Private Partnership (PPP)-model for motorways

Oismüller, Alexander; Steinauer, Bernhard (Thesis advisor)

Aachen (2014)
Dissertation / PhD Thesis

Aachen, Techn. Hochsch., Diss., 2014


During economic crisis well developed public private partnerships (PPP) give an opportunity to even though realise necessary infrastructural projects. Four key characteristics of PPP - lifecycle view of the project, risk allocation, performance-oriented payments, output-oriented tenders - may lead to high efficiency advantages compared to traditional procurement as a result. So far three different types of PPP were used within motorway-projects in Germany - the so called F-Modell, A-Modell and Funktionsbauvertrag. An analysis of the to date realised projects showed, that - besides the actual choice of the project - the risk to determine the future traffic volume is a key issue of success. The in the course of this thesis developed availability based approach changes the projects financial basis from the PPP-traditional traffic volume based payments to availability remunerations. To obtain the basic availability payment it is necessary to calculate the total amount of costs that will occur during the projects entire lifecycle. Based on the thus determined net present value and the duration of payments you may identify a yearly annuity, which represents the maximum amount of the availability based payments and upper ceiling during the tender procedure. If the private operator is not able to provide full availability - be it quality or quantity based -, the public body is given the possibility to withhold parts of the payment as contractual penalties. These contractual penalties may be determined as a percentage of the payments (if quality based availability is not sufficient) or as a monetary amount, which is calculated by valuating the due to the construction site caused consequences to the national economy. For this purpose the necessary evaluation criteria are the extra time of traffic congestion, the change of costs of car accidents, the change of operating resources consumption and the variation of pollutant emissions. The in chapter 5 calculated example proved that this new approach offers more service for the same costs of the so far used A-Modell and gives the public body even the possibility to gain time, as there are some variations of payment which allow the concession donator not to pay during the entire construction phase. Another advantage of this new model is that the contractual penalties really do show the effects of an operators failure to the economy and are therefore not a result of negotiations between the public and private contracting partners but engineering calculations.