The data export application in the analysis tab has a user manual in the User section of the portal documentation called Data Extraction. This walks through a quick example based on a common use case. There is also an excel plugin that may be useful. Additionally if you are doing repeated analysis in a 3rd part tool, it is probably appropriate to use the API via script or program.
Step 1: Locate the Data Export application, ensure filter is open
Step 2: Filter for Site & Asset Type that you wish to load tags from
Step 3: Add Tags
Step 3 a: Select Asset Tags check box, Search for the desired tag
TIP: There are a couple of ways to retrieve the data you want. For example, if you wanted 10 minute average values, you could utilize the 10 minute tag itself that stored that 10 minute record, or you could use the real time tag, and perform a 10 minute average "on the fly" when you export the data.
Step 3 b: Add the next tag
For this example, we will have wind speed and active power together group by asset on the export. However we are adding the tags one after the other for illustration.
Step 4: Setup Data Export Parameters
NB! Review data export time zone article for understanding whether to use the UTC switch to leave.
These properties are going to export a "on the fly" 10 minute average in a specified date format that is friendly with excel. We're picking the "last 7 days" time frame for 75 turbines. It took 2 minutes to download the file. For data exports that may span long time frames, such as a year, it is best practice to break this up into ~ 2 month segments. Obviously it depends on how many tags you're attempting to export.
NB! "CSV" file in this case use's semi-colons ';' to separate data, this is a good catch all for mixed data cultured product where commas and decimals are different between countries.