Energy companies are “seriously concerned” about plans by the Netherlands Authority for Consumers and Markets (ACM) to introduce a so-called feed-in tariff that would require large electricity producers to help pay for expanding the power grid. The ACM wants to introduce the feed-in tariff in phases, at the earliest from Jan. 1, 2032. The ACM announced Thursday it is proceeding with further development of the tariff, which would apply to producers such as solar parks, wind parks, and power plants.