A once-off additional fuel allowance payment of €300 is also due to be paid from the 20th of November.
The Society of Saint Vincent de Paul says many families are still very worried about their energy bills, despite price reductions from this month.
450-euro in electricity credits were announced as part of last month's budget, which will apply to bills between the start of December and the end of March next year.
A once-off additional fuel allowance payment of €300 is also due to be paid from the 20th of November.
Customers of Electric Ireland, SSE Airtricity, and PrePay Power will see price cuts on their bills from today, with Bord Gais Energy and Flogas following suit next week.

Government Moves To Let Gardaí Alert Schools After Domestic Violence Incidents
Aerosol Misuse In Kildare Raises Fears Of Sudden Death Risk Among Teens
New Housing Plan Could See Kildare County Council Bidding Against First-Time Buyers
Remembrance Service For JoJo Dullard: Parish Marks Three Decades Since Disappearance
Local Property Tax Deadline Extended To Wednesday
Lawless Rejects Claim He Let Apprenticeship Exam Leak Scandal "Fester"
Three Teenagers Arrested In Connection With Rioting At Citywest Hotel Last Month
Alleged Admissions Row Ignites Between Leixlip Schools Over Irish V English Language Pathways