SAP BW - utilities EDM business content and usage

Dear experts,

I would like to know what the best practise and experience is regaring the usage of EDM business content for utilities.

We need to create balance settlement reports and have a huge amount of data volume (meters which submit a meter reading every 15 minutes).

What are the best practises regarding the usage of SAP Business Content for EDM balance settlement reports?

Are real time/direct access extractors available/used.

If detailed records need to be available for reporting, is this done directly on the source system? Or is BW used?

Is reporting in for example webi possible in the source system directly (not desired).

Could you please help me on answering these questions, any other input regaring SAP BW and EDM reporting is more than welcome.

Thanks in advance!