Variation Management Strategies for Future Construction Sites: A study to address role of an equipment rental business in the energy transition
Examensarbete för masterexamen
Industrial ecology (MPTSE), MSc
Construction sites are facing challenges with high power peaks due to electrification of heavy equipment where potential consequences are increased power tariffs locally and risk of limited power supply. Another development is an increased intermittent power supply due to more wind- and solar power in the electricity system, which causes price fluctuations. These two developments strengthen the incentive to look at flexibility services. This study investigates different strategies to handle these two challenges in an equipment Rental business and how they can contribute with flexibility measures at construction sites for the electricity system. The methods used in this study were an interview study and a case study where a model of the electricity demand at a construction site was created. In the case, the potential of using battery storage at a construction site for peak shaving and load shifting was evaluated. This was done by optimizing the system cost at the case to see if it is efficient to invest in a battery and be flexible with the load, or purchase electricity directly from the grid. The interviews were a part of mapping the challenges faced by the Rental business and construction sites related to power supply and a changed electricity system. Further, the purpose of the interviews was to evaluate the barriers to using different flexibility services at a construction site. Some output from the interviews was also used for making assumptions in the model about the use of equipment to estimate the power demand of electrified equipment. One outcome of the interview study was that the Rental business has a role in providing comprehensive solutions to the customer and enabling climate-neutral construction sites. Another conclusion was that the Rental business could have an educating role and recommending the most suitable option when electrifying a construction site, which in the future can include flexibility services such as battery storage. The case showed that it was efficient to invest in battery storage to shift the electricity demand. The optimal battery size was mainly affected by electricity prices during the observed time period, the magnitude of the peaks, and the recurrence of peaks. Another outcome was that critical peak loads can occur in an early phase of construction due to homogeneous charging behaviors of vehicles during breaks. This suggests a selection of batteries with high discharge capacity. Additionally, a combination with charging strategies was effective to reduce costs.
battery storage , variation management , flexibility services , peak shaving , load shifting , demand side management , rental business , electrification , construction equipment , construction sites