Brandwave

100Green vs British Gas:Which is more popular?

In September 2026, British Gas had more branded searches than 100Green among energy suppliers in the United Kingdom. British Gas had about 1 million branded searches, while 100Green had 5,400. British Gas made up 27.5% of all energy supplier searches we track, and 100Green accounted for 0.15%. When we asked ChatGPT and Google AI Overviews about energy suppliers, 100Green and British Gas each appeared in two of the five answers. 100Green and British Gas were each mentioned first in two of the four answers that named either.

Among energy suppliers in the United Kingdom in September 2026

Who do people search for more?

British Gas, about 185 searches for every 1 for 100Green

British Gas 1M searches100Green 5.4K searches

Who does AI mention more?

Both were mentioned in 2 of 5 answers.

100Green in 2 of 5British Gas in 2 of 5

Who does AI recommend more?

Each is named first in 2 of 4 answers.

100Green first in 2British Gas first in 2

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Top energy suppliers in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, 100Green and British Gas were each mentioned in two out of five: in one of the three ChatGPT answers and in one of the two Google AI Overviews. 100Green and British Gas were each listed first in two of the four answers that named either.

Most recommended by AI

Brands get a higher ranking if they are mentioned earlier in the answers.

  1. Octopus Energy1st
  2. E.ON Next2nd
  3. Outfox Energy3rd
  4. British Gas4th
  5. 100Green5th
  6. EDF6th
  7. ScottishPower7th
  8. OVO8th
  9. Ecotricity9th
  10. Good Energy10th
  11. +1 more

Mentioned by AI

Each dot is one answer, filled in when that answer mentions the brand.

  • Octopus Energy5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • E.ON Next5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • Outfox Energy4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • British Gas2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • EDF2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • ScottishPower2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • 100Green2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • OVO1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Ecotricity1 of 5Named in 0 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Good Energy1 of 5Named in 0 of 3 ChatGPT answersNamed in 1 of 2 Google answers

+1 more

See every answer about energy suppliers

5 answers

Not named in any answer:

Brands are shown in the order each answer named them. The survey took place in United Kingdom on October 22, 2026.

Is 100Green or British Gas more popular in search?

This chart shows how often people search Google for 100Green and British Gas by name. Each line represents a brand's share of searches for all 11 energy suppliers we track, month by month, from searches in United Kingdom.

100Green and British Gas among energy suppliers in the United Kingdom, by month

Share of searches by month for British Gas, 100Green. The figures are in the table below the chart.

View monthly share of searches table
MonthOctopus EnergyBritish GasE.ON NextOVOEDFSo EnergyOutfox EnergyEcotricityGood EnergyScottishPower100Green
Oct 202530.7%30.7%13.8%11.3%9.2%1.9%1.1%0.56%0.3%0.2%0.11%
Nov 202531.1%31.1%13.2%11.5%9.3%1.9%0.84%0.46%0.31%0.21%0.11%
Dec 202529.8%29.8%14.3%13.4%8.9%1.8%0.8%0.54%0.3%0.2%0.11%
Jan 202630%30%13.6%13.5%9%1.8%0.89%0.55%0.3%0.2%0.13%
Feb 202629.9%29.9%13.6%13.5%9%1.8%1.1%0.66%0.3%0.24%0.11%
Mar 202631.1%31.1%13.7%11.5%8.6%1.9%1%0.57%0.31%0.25%0.11%
Apr 202635%28.7%13.4%10.5%8.6%1.7%0.94%0.52%0.23%0.23%0.1%
May 202630.5%30.5%14.9%11.2%9.1%1.5%1%0.83%0.25%0.2%0.09%
Jun 202630.5%30.5%14.1%11.2%9.2%1.5%1.3%0.68%0.3%0.45%0.16%
Jul 202630.9%30.9%13.9%11.4%9.3%1.5%0.99%0.56%0.25%0.2%0.17%
Aug 202630.7%30.7%13.8%11.3%9.2%1.9%0.99%0.83%0.25%0.2%0.17%
Sep 202633.6%27.5%14.3%10.1%10.1%1.7%1.1%0.91%0.27%0.22%0.15%

How has the 100Green and British Gas comparison changed over the last 12 months?

3 findings

How did search popularity change for United Kingdom energy suppliers in September 2026?

3 changes

  1. In September 2026, Octopus Energy overtook British Gas to become the leader among energy suppliers in the United Kingdom, with 33.6% of the searches.

  2. In September 2026, British Gas lost share of searches among energy suppliers in the United Kingdom, from 30.7% to 27.5%.

  3. Estimated monthly branded searches for 100Green in the United Kingdom rose 22.7% over 12 measured months, from 4.4K to 5.4K in September 2026.

How are branded searches counted?

2 search terms

Brandwave collects information about searches that people make online using 100Green’s and British Gas’ names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.

100Green

1 branded search term

  • 100green

British Gas

1 branded search term

  • british gas

How the Brand Demand Index is measured

Other head-to-heads among energy suppliers

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