It is indeed for the extension.tyrexoid said:
is it only for extension, or for initial application to this type of visa as well? What about bank statements from abroad, they don't consider it?
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Before applying for 1 year extension, you need first to get a 90-day non-immigrant O visa that you can get in any Thai embassy/consulate abroad. Financial requirements will vary according to each consulate (e.g.: "Applicant's bank statement showing at least THB 400,000 or equivalent in other currencies for the past 2 months", "Applicant's recent bank statement during the past 6 months", ... ).
It is also possible to convert your current visa or visa exemption into a non-immigrant O visa within Thailand.
Financial requirement (Bangkok Chaeng Wattana immigration office): need to show 400K THB in a Thai bank account on the day you apply. You need at least 15 remaining days on your visa or visa exempt stamp to apply.