Galway County Council has asked Apple to provide more detailed information regarding its proposal to construct an €850m data centre outside Athenry.
The computer giant lodged a planning application to build a 25,000sqm facility at Derrydonnell earlier this year. It would employ 150 people when fully operational.
The company hopes to have the facility ready for use by 2017.
A final decision from planners was expected this week but that has now been delayed after the local authority sought further details about the manner in which the plant would be powered and the impact construction might have on the landscape.
Apple has six months to respond to the request for further information.
The council wants to know how the developers would implement and fulfil a commitment to run the centre with 100% renewable energy.
It is seeking clarity as to how much electrical power would be needed to operate the facility and the reasons why the company needs 18 generators, when the planning application states only one would be in use at any one time.
In addition, the local authority wants more information about the volume of construction traffic that would have to use the public road network.
It has requested a detailed breakdown regarding the quantity of building material that would be brought to the site and the quantity of wood that would have to be removed from the area, as a result of tree felling, to facilitate the development.
Planners are also concerned that the possible impact of flooding in the area may not have been fully taken into account by Apple.
There have been a small number of objections to the planned data centre since the application for approval was lodged in April.
Several groups and individuals have called on the company to fund the construction of a greenway cycle path from the site to Athenry and south towards Craughwell. One submission says such an initiative would be "the kind of creative idea Steve Jobs would have been proud of".