All sustainably-generated electricity goes via national high-voltage grids to industry and consumers. Since 2016, we have been advising TenneT, the Dutch national grid operator, on the ecological effects of the high-voltage network, such as collisions of birds and bats. Our broad expertise across the field of energy transition is unique within the Netherlands and highly valued internationally! We advise on environmental impact assessments and research the effectiveness of different types of wire markings to reduce bird strikes. At sea, we study the effects of electromagnetic fields from cables in the seabed on marine fauna.