TenneT earnings before interest and taxes, excluding special items, was up slightly last year compared with the 2020 to €801m from €796m.
Revenue increased to almost €6.40bn in 2021, up from €4.45bn in the previous year.
The Dutch/German transmission system operator said it invested a record €4bn in the expansion and maintenance of its grids last year and will increase its output towards a minimum annual investment level of €6bn by 2025.
TenneT said it managed to maintain a high grid availability of 99.99999% overall.
TenneT chief executive Manon van Beek said: “Even as we work at speed to build and maintain our grid for a fossil-free future, demand for grid capacity in the here and now is also growing fast.
“Linear growth alone cannot solve this squeeze, and we are looking at many ways to make smarter use of our existing grid as well as investing much time and effort into so-called system thinking.
“The latter involves holistic solutions and systemic planning for the entire energy system and is a real leap forward for the energy transition.
“To this end, we are focusing on faster project delivery, proactive planning, and innovative solutions. In this context,
“I would like to thank the many experts and partners who dedicated themselves to developing the Target Grid and the Wind Power Booster.”