Factsheet Green Deal DC Haarlemmermeer



Parties involved

Direct Current B.V., Siemens Netherlands N.V. and Joulz B.V.

Description of the initiative

The project DC=DeCent includes a unique and sustainable electricity gridon the basis of direct current (DC) in the Haarlemmermeer. An electricity grid on the basis of direct current reduces significantly both the number of conversions of energy as well as the energy loss due to conversions and makes it possible to balance the grid. The energy generation takes place with local CHP cogeneration, which is controlled by a management system for regulating the demand and supply of electrical energy. This local DC grid will outstep one or more real-property boundaries. Optionally in the second stage of the project Electric Transport (EV), the local DC grid will be connected to the main DC grid, allowing charging of the EV, which will be controlled and fed by the greenhouses.


DC is a scientific and economic opportunity for the Netherlands and makes it possible to develop a unique innovative knowledge market. The vast majority of all devices in homes, offices and electric vehicles are already working internally on DC. Even renewable energy sources like solar panels supply direct current. Since we live in a DC world, and the energy transportation still takes place in AC, there are continuous conversions from DC to AC and AC to DC. Each conversion is accompanied by energy loss in the form of heat. 

In DC, these DC to AC conversions are no longer needed, which saves energy. Accumulated over the entire chain savings can reach 20%. The project DC=DeCent contributes to further accumulation of knowledge about this technology and offers, thanks to concrete experiences, insight into the social feasibility of the realization of dc grid systems in the Netherlands and abroad.

Performance by the initiator

  • The parties are committed to make the usage of energy-saving dc a common good in the distribution and generation.
  • This project is one of the first steps to this end.
  • The parties will endeavor to achieve standards and norms for DC technology.
  • The parties will endeavor to make DC a standard field in higher technical education and will then support this field by giving (guest) lectures and readings.
  • Direct Current BV will endeavor to pair up its DC knowledge with the developments within DC=decent. In particular, the knowledge concerns power electronics and knowledge of DC and the realisation of medium-voltage DC to low voltage DC converters in the infrastructure.
  • Joulz will endeavor to design the energy infrastructure, and to build and maintain it. Also Joulz will stand ready, day and night, for clearing malfunctions.
  • Siemens will endeavor to find solutions for the converter technology for the interconnection of AC and DC grids in medium-voltage DC (MVDC / MVAC), the demand-side and capacity management. If necessary, Siemens will also use its knowledge for electricity storage, automation systems and solutions for intelligent charging infrastructure.

Consideration by the Central Government

  • In the project, one runs against legal and technical standards barriers, because the Dutch legislation is not designed for the use of DC. To break down these barriers the parties appeal to the Government.
  • With regard to measuring the supply and consumption of DC, the Central Government will endeavor to provide continuation to results of the experiment which can be applied on a broad spectrum. The joint grid managers will be asked to investigate whether and how standards for the supply and measuring of DC should be inserted into the technical codes.
  • The government will - using the results of the experiment - through a so-called sponsorship of standards aid private parties to allocate standards for DC.
  • The government will endeavor, using of the results of the experiment, to eliminate any obstacles to obtaining an EAN code, so that exchanging energy on business level is possible.