Bigbux is not quite correct - FOI relates to any information held by a public body, not just information held electronically. The fee relates to the cost of finding the required information (for example, time spent searchibg through paper or electronic filing systems) rather than simply the cost of reformatting information. An enquirer can request that the information is provided in a particular format, and nowadays this is quite likely to be some sort of electronic format, but a reply on paper would be equally acceptable if the enquirer had not specified a format.
Public bodies are encouraged to make information available via their websites, to avoid the need to respond to requests; this includes publishing the results of previous FOI requests, suitably redacted to remove the enquirers' identities as required under Data Protection legislation.