From where exactly? From a form? From a SQL query you have written? What data is it you are looking to export?
if source is form, then we can use export option in file menu.
if source is sql query, you can use toad to export the data to excel.
Please update your profile and provide a more appropriate handle.
EBS is not playing nice with export to Excel, since EBS was created in the early 80's and is still living in the past in many aspects.
You can use BI publisher report to generate an Excel spreadsheet through a concurrent program. An easier method would be to use APEX and export a CSV file, or with the help of APEX Office Print, a native Excel file.
I recognize this is a "Reader's Digest" version of possible solutions, but if you define your requirements more accurately, I'll be able to provide a more precise answer.