The Department of the Environment has written to each election returning officer in the State seeking details on the contracts and arrangements for the storing of electronic voting (e-voting) machines.
It followed revelations that two returning officers owned or rented the facilities that the machines were being stored in and were receiving rent.
It also emerged that there were wide variations in the costs of storage around the country, with it costing up to five times as much to store the machines in some areas, eg Waterford.
Yesterday, a spokesman for the Department of the Environment said that officials wrote to returning officers late last month requesting details about the procedures used to identify storage facilities for the machines.
Most of the returning officers had now forwarded the details, which are to be presented to the Public Accounts Committee next week by secretary general of the department Niall Callan.
Mr Callan is expected to come under further detailed questioning by the committee, which is investigating the costs of storing the machines.
The total cost of storing the 7,5000 machines this year, which were bought as part of a €52 million e-voting initiative last year, is expected to be €658,000.
The highest storage cost per machine is in Co Waterford, where the returning officer is paying €50,000 to store 195 e-voting machines.
This compares with a bill of €10,8000 for storing 200 machines in Co Clare.
Previously, the department had details from six returning officers relating to the companies which had contracts to store the machines.
This included the fact that Brendan Walsh and his daughter, Cara Walsh, had the storage contract in Dublin city; while John Fitzpatrick had the contract for Dublin County.
Mr Walsh and Mr Fitzpatrick are the returning officers for both areas.
Last month both defended the situation, and said the State was getting value for money as a result of their moves to purchase premises to store the voting machines.
Mr Fitzpatrick said he had bought a unit in the Tolka Valley Business Park in Dublin which he rented to the Department of the Environment to store the machines.
Mr Walsh said he did not stand to make any profit from his rental of premises at Ballycoolin in Dublin.
The high storage costs have also been defended as necessary because of the security costs needed for the storage, and the cost of converting the premises to ensure against rust and other damage to the machines.
E-voting had been due to be introduced for last year's local and European elections.
The initiative, which had also been the subject of a major promotional campaign, was halted after an independent commission raised questions about whether the security and accuracy of the e-voting system could be guaranteed.