The price is the expected spot price on electricity. It does not include taxes, fees etc. and the calculation is never more precise than the data supplied by Nordpool and the Danish National Bank (used to convert from EUR to DKK) and my code is not guaranteed to be bug free.
Every day at around 12pm - 1pm the price for the next 24 hours is agreed upon. This means that up until that timeframe you may see fewer than 24 timeslots with electricity prices. That's just how it works.