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#1 Moray
Are reports available in CSV format? All I can find are graphic reports...
Reports in spreadsheet format
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#2 SJB
You can download the daily data from the portal and create your own reports: goto My Inverter, click on 
(top RHS), select the date you want and click on the download button. I vaguely recall that there were/are some issues with columns being mixed up a few months ago.
There is also an API (https://beta.givenergy.cloud/docs/api/v1#introduction) that you can use to get the data.
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#3 Rtidey
I have created some scripts in powershell and python which use the API to download data for a range of dates in csv format that can be put int spreadsheets.
I mostly use GE_DaysIntervalDataPoints.py which can either get data at regular intervals or can pick out dta for the Flux intervals.
Spreadsheet templates are also available for processing this data.