Netherlands Balancing Price. This is an experimental tariff, it will not reliably control your devices (yet). New data for this tariff is only available about 1 minute 20 seconds late.
A lot of good information about the Netherlands Balancing price here:
https://gathering.tweakers.net/forum/list_messages/2245152/0
An average day in the Netherlands 1-minute plan
Average Daily Prices
Average Monthly Prices