15-minute MTU instead of 60-minute MTU.

[viperhansa]

The energy market is transitioning to 15-minute MTU instead of 60-minute MTU.
This breaks the data collection and presentation of the price per unit.

Version of the custom_component

0.0.17 (latest)

Homeassistant version

2025.10.01

Configuration

Have no access to HA at this workstation.

## Describe the bug
There is no bug, Nordpol custom component needs a rewrite to handle the 15-minute MTU.


## Debug log

Same as ##configuration, do not have access to my HA from this workstation.

[Jozo81]

In many places electricity is still sold with hourly prices (might be so for several years forward) due that power meters are not updated yet etc. Nordpool custom component shows the price of first 15 minutes of an hour in current price sensor. Would it be possible to choose from 15 minute MTU or hourly average 60 min MTU?

[omakoti]

In many places electricity is still sold with hourly prices (might be so for several years forward) due that power meters are not updated yet etc. Nordpool custom component shows the price of first 15 minutes of an hour in current price sensor. Would it be possible to choose from 15 minute MTU or hourly average 60 min MTU?

Yes, this would be great fix because now the sensor state shows the wrong price after the first 15min of every hour.