Add option for 60-minute averaged price (instead of 15-minute MTU updates)

[ojm88]

After the transition to 15-minute MTU, the sensor now updates every 15 minutes. While this reflects the market data, it introduces challenges for automations and dashboards.

In Norway, household customers are still billed based on hourly prices, calculated as the average of the four 15-minute intervals within each hour. Because of this, the current 15-minute updates do not reflect the actual end-user price.

Feature request:
Add an option to choose between:

• Raw 15-minute prices (current behavior)
• Hourly averaged price (60-minute), matching how consumers are billed

This would make the integration much more usable for:

• Smart charging logic
• Energy dashboards
• Cost calculations

The goal is not to remove 15-minute support, but to make hourly averaging selectable.

Thanksfor your work on this integration.

[catdogmaus]

This is true.
In Estonia there will be years(!) before price would be calculated by actual 15 minute interval. So that 15 minutes in Nordpool is just option but in most countries they still use 60 minutes for foreseeable future.

[BrentVerhaegen]

In Belgium we can choose in which system we want to be.
I'm still on the 1-hr time window system and would love to have this option for my automations

[jtagcat]

Ran out of time. https://github.com/jtagcat/nordpool (can be added in HACS) has working hour averaging for 'Raw Today' (but not for 'Today'). Cleanly implementing it in one (and right) place is a headache, but doable with few hours time. Rule of thumb is to double all time estimates by two :)