The Selectra Score condenses multiple dimensions of an energy offer — price, customer experience, and environmental credentials — into a single letter from A (best) to E (worst). It is recalculated daily so that it always reflects the latest rates and reviews.

How Is the Selectra Score Calculated?

The score is built in four steps: data collection, quality rating, percentile ranking, and letter grading.

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Step 1 — Data Collection

Every day, we calculate the annual bill for every electricity and gas offer listed in Selectra's rates database, which is maintained manually by our team. Bills are estimated for a typical Irish domestic household using the following consumption profiles:

Step 1 — Data Collection comparison table
Energy Meter Type Annual Consumption
Electricity Standard 24-hour 4,200 kWh
Electricity Day/Night (NightSaver) 2,625 kWh day + 1,575 kWh night
Electricity Smart (Day/Night/Peak) 2,275 kWh day + 1,575 kWh night + 350 kWh peak
Gas Standard 11,000 kWh

These figures are based on the consumption profiles defined by the Commission for Regulation of Utilities (CRU) and cover the main metering configurations available in Ireland. Every offer is priced under every applicable profile so that the comparison is fair regardless of meter type.

Step 2 — Quality Rating

Each offer receives a composite quality score that blends customer satisfaction with service features and environmental credentials. The score is built from:

Step 2 — Quality Rating comparison table
Factor Points How It Is Measured
Customer reviews Up to 5 Weighted average rating across review platforms (Trustpilot, Google, etc.), with more weight given to platforms with more votes
Mobile app 0 or 1 1 point if the provider offers a mobile app for account management
Customer service 0, 1, or 2 2 points for full support (phone, email, chat); 1 point for partial support
Green energy 0, 1, or 2 2 points for 100% renewable electricity; 1 point for a partly green offer; 0 for standard fossil-fuel supply

Maximum possible quality score: 10 points (5 + 1 + 2 + 2).

Step 3 — Percentile Ranking

Both the annual bill and the quality score are converted into percentiles relative to all offers of the same energy type (electricity or gas). A percentile tells you where an offer stands compared to the rest of the market:

  • Price percentile: ranks the offer's annual cost against every other offer. A higher percentile means the offer is cheaper relative to the market.
  • Quality percentile: ranks the composite quality score against every other offer. A higher percentile means better reviews and features.

The two percentiles are then averaged equally — price and quality carry exactly the same weight in the final score. This means a very cheap offer with poor reviews can score the same as a pricier offer with excellent service, ensuring no single dimension dominates.

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Step 4 — Letter Grade

The averaged percentile is mapped to a letter using fixed thresholds:

Step 4 — Letter Grade comparison table
Score Percentile Range Meaning
Score A 80–100 (top 20%) Excellent — among the best value on the market
Score B 60–79 Good — above-average price and quality
Score C 40–59 Average — in line with the market
Score D 20–39 Below average — weaker on price, quality, or both
Score E 0–19 (bottom 20%) Poor — among the least competitive offers

Because the score is recalculated daily, an offer's grade can change whenever rates are updated or new customer reviews come in.

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Average electricity bill: €1,564.10 (24-hour urban standard meter)

Average gas bill: €1,509.24 (standard meter)

Ready to Switch and Save on Your Energy Bills?

Our energy experts at Selectra compare all 11 Irish suppliers to find you the lowest rate for your home — completely free.

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This is a free call from Ireland. Selectra agents can assist you with comparing and switching energy providers on weekdays between 9 am and 5.30 pm.

Frequently Asked Questions About the Selectra Score

The Selectra Score is a single letter from A (best) to E (worst) that combines price, customer service, and green credentials to help consumers compare energy offers. It is recalculated daily to reflect the latest rates and reviews.
The score is built in four steps: daily data collection of annual bills, a quality rating (customer reviews, mobile app, customer service, and green energy), percentile ranking against all offers, and conversion to a letter grade. Price and quality carry equal weight.
An A score (top 20%) means excellent value, B (60-79th percentile) means good, C (40-59th) is average, D (20-39th) is below average, and E (bottom 20%) means the offer is among the least competitive on the market.
The score is recalculated every day. An offer's grade can change whenever unit rates are updated or new customer reviews come in across platforms like Trustpilot and Google.
No. Price and quality percentiles are averaged equally, so a very cheap offer with poor reviews can score the same as a pricier offer with excellent service. No single dimension dominates the final score.