To get the first lump sum in October 2017, you must submit your completed form before September 15th 2017.

How to Apply
New applicants for Fuel Allowance need to fill in application form. http://www.welfare.ie/en/pdf/FA_CPF1.pdf.
This application form is also available from your local post office and can also be requested by texting FORM FUEL followed by your name and address to 51909.
If you apply for the Fuel Allowance after the start of the heating season (in October), the allowance will not be backdated.