Energy production requires handling and discharge of waste waters that may be contaminated with both inorganics and organics of geochemical nature, and with significant amounts of production chemicals. Restrictions on water discharge from the O&G industry is expected to tighten in the coming years and is already part of operators´ license to operate. From present dispersed oil measures we see a move towards regulatory requirements related to dissolved toxic species. The area of produced water management (PWM) comprises all possible mechanisms and operations leading to the final water quality for either discharge or reinjection. Insights of this affect the environmental impact and how this can be reduced. This reduction will become increasingly important in the future in many regions in the world. The whole value chain of PWM can be addressed in this session. We also want to include the new energy solutions and how these can impact ecosystems by creating new water based pollution. There are plenty of cases in the history of energy development where the last step (PWM) was not solved upfront but in reactive mode – that is when the negative ecological impact was discovered and remediation had to be developed. The recent EU guideline on Safe and Sustainable Design for chemicals and materials address this. Papers connected to pollution by new energies are therefore welcome.