Question:
Is there a report that I can export to csv the KWH daily usage for a meter account ?

Can I then also export this information for a group of meter accounts for a set time period ?

Answer:
Some clients gets daily reports via XML.
I believe that can also be opened in Excel?
The docs for that is under Tools->WebServiceDocumentation. You should typically be able to construct a URL with the username and password in it, as well as the date and also selection criteria (wildcards allowed); and then it will load the XML.