The average Irish gas-heated home spends between €1,200 and €1,700 per year on natural gas, depending on usage and which supplier is billing them. With four active gas suppliers competing for your business, the difference between the cheapest and most expensive tariff for an identical household can comfortably reach €200–€300 per year. Switching takes around 15 minutes and there is no interruption to your gas supply.
Here is where the market stands in June 2026 and how to find the cheapest gas deal for your home.
How Irish Gas Tariffs Work
Every gas tariff in Ireland has two cost components:
| Component | What it is | |-----------|-----------| | Unit rate (c/kWh) | Price per kilowatt-hour of gas consumed | | Standing charge (c/day) | Fixed daily network access fee, charged regardless of usage |
The formula for comparing any two tariffs is straightforward:
Annual cost = (unit rate × annual kWh) + (standing charge × 365)
The average Irish gas-heated home consumes approximately 11,000 kWh of gas per year, but this varies significantly. A poorly insulated older house or a large property can use 15,000–20,000 kWh annually. An A-rated home with a heat pump may use much less. Enter your actual usage figure from a recent bill for the most accurate comparison.
The Active Irish Gas Suppliers
Bord Gáis Energy
Bord Gáis Energy is Ireland's most recognised gas supplier and consistently one of the most competitive on price. Now part of the Centrica group, Bord Gáis offers standard gas tariffs and new customer online discounts that typically last 12 months. For households that heat primarily with gas, Bord Gáis is almost always in the top two by annual cost — and their dual-fuel bundle offers a further saving for customers who also want to move their electricity.
Flogas
Flogas is a well-established Irish energy brand with decades of experience in natural gas, LPG, and electricity supply. Flogas gas tariffs are competitive with Bord Gáis Energy, and they frequently run promotional rates for customers switching online. It is worth running both Bord Gáis and Flogas through the comparison at the same time — depending on the month, either can come out cheaper for a given usage level.
SSE Airtricity
SSE Airtricity offers natural gas tariffs alongside their electricity plans, with the incentive of a dual-fuel discount for customers who consolidate both fuels. Their unit rates are competitive, and as Ireland's leading renewable energy supplier, they also offset gas supply with renewable investment elsewhere in their portfolio. A good choice if you value green credentials and want to manage electricity and gas through a single account.
Energia
Energia also supplies natural gas to Irish homes, with unit rates and discount structures broadly similar to the other three. Always worth including in a comparison — particularly if their current promotional rate happens to undercut the market.
Carbon Tax: What's on Your Gas Bill
In addition to the unit rate and standing charge, Irish gas bills include a carbon tax component. Carbon tax on natural gas has increased incrementally each year under the Irish government's climate action plan. It is applied per kWh of gas consumed and shows on your bill either as a line item or embedded in the unit rate, depending on how your supplier presents it.
Carbon tax applies equally across all suppliers — it is a government levy, not a supplier margin. It is not a reason to choose one supplier over another, but it is worth understanding why your gas bill does not simply equal (unit rate × kWh).
New Customer Discounts on Gas
Like electricity, Irish gas suppliers offer new customer discounts — typically 20–30% off the standard unit rate for the first 12 months after switching. Once the discount period ends, the rate reverts to the supplier's standard tariff, which is usually among the most expensive available.
The optimal strategy: switch when your discount expires (set a calendar reminder at month 11), then compare gas tariffs again and repeat. Annual switching is the most reliable way to maintain a competitive rate.
Fixed vs Variable Gas Rates
Most Irish gas tariffs are variable — the unit rate can change with reasonable notice from the supplier. A small number of fixed-rate plans lock your price for a set term (typically 12 months), offering certainty at the cost of flexibility. Fixed rates protect against price rises but mean you won't benefit if wholesale gas prices fall during the fixed term.
For most households, a variable tariff with a new customer discount delivers the best price in year one — provided you act again when it expires.
Find the Cheapest Gas Tariff Right Now
Enter your annual gas usage in GoSwitch, select Gas as your fuel type, and see every active Irish tariff ranked by true annual cost — standing charge included, not just the headline discount percentage.
The cheapest gas tariff for an 11,000 kWh home changes regularly as suppliers adjust rates and promotions. Check GoSwitch before your discount expires and again whenever you see news of energy price changes — it takes less than two minutes and costs nothing.