Question-and-Answer Resource for the Building Energy Modeling Community
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A few considerations that may help you:
Newer versions of EnergyPlus can produce native CSV (rather than producing ESO, which is converted to CSV). You can enable this by using OutputControl:Files,Yes; in your IDF. See here for example for more information.
You might consider using an existing EPW generation tool. For example, there is Elements and also several python products -- pyepw (it hasn't been updated in a while but there are some recent forks like here), diyepw, and epw.
Maybe other users will provide additional suggestions.
