Updated September 30, 2026 · TariffCue Editorial Team
100Green vs Eni Plenitude
What sets them apart
| Compare |  100Green |  Eni Plenitude |
|---|---|---|
| Fixed terms | 12 | 24 |
| Exit fee | £0 | €0 |
| Renewable basis | Ppa | Certificates |
| Markets | GB | IT, FR, ES, PT, GR, SI |
| Unit rate | Not confirmed | €0.172 |
| Standing charge | Not confirmed | €144 |
| Export rate | £0.12 | Not confirmed |
| Smart meter required | Yes | Not confirmed |
| Regions served | Not confirmed | Italy |
| Customers | Not confirmed | 11,000,000 |
Same on both: Renewable share (100%).
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Key differences
- 100Green scores higher overall: 9.3 vs 8.8.
- Support channels: only 100Green offers Email.
- Founded is lower at 100Green: 2001 vs 2022.
- Eni Plenitude is available in 5 more countries.
- Tariff types: only 100Green offers Green, Ev, Time of use.
- Fixed terms: only 100Green offers 12.
- Fixed terms: only Eni Plenitude offers 24.
- Markets: only 100Green offers GB.
- Markets: only Eni Plenitude offers IT, FR, ES.
Our verdict on each
100Green
100Green suits GB households that want renewable electricity and a free exit fee, with fixed terms set at 12 months and no charge to leave before the term ends. The offer covers both fuels, and the renewable supply sits behind a power purchase agreement.
Eni Plenitude
Eni Plenitude suits Italian households that want electricity and gas on a single fixed deal with an energy exit fee of €0. The tariff is listed at 100% renewable on a certificate basis, and the fibre broadband sold alongside gives a second reason to stay with one supplier.
Score breakdown
| Area | 100Green | Eni Plenitude |
|---|---|---|
| Cost | 9.4HigherExit fees are £0, and the supplier ranks 1 of 29 brands on that measure. | 8.8Unit rate of €0.17 sits near the €0.17 market median, while the €144 standing charge sits well above it. |
| Offer | 9.4HigherTariffs cover fixed, variable and green, a wider set than Octopus Energy at fixed, variable and green or Vattenfall at fixed, green and variable. | 9.3Fixed and variable energy tariffs covering electricity and gas, plus fibre broadband entry €19.90 with 2,500 Mbps download. |
| Trust | 8.9HigherTrades as Green Energy (UK) Limited and has been trading since 2001, based in GB. | 8.0Founded in 2022 as Eni Plenitude SpA Societa Benefit in IT, with support on phone, chat and help centre. |
Where these facts come from
100Green
- 100green.com: 13 facts, checked September 30, 2026
Eni Plenitude
- eniplenitude.com: 12 facts, checked September 30, 2026
- corporate.eniplenitude.com: 3 facts, checked September 30, 2026
How they place
| Ranking | 100Green | Eni Plenitude |
|---|---|---|
| Green energy suppliers | 12 of 56 | 5 of 56 |
| Energy tariffs without exit fees | 5 of 19 | 3 of 19 |
Every fact side by side
| Fact | 100Green | Eni Plenitude |
|---|---|---|
| Tariff types | Fixed, Variable, Green, Ev, Time of useCovers more | Fixed, Variable |
| Fuels | Electricity, Gas | Electricity, Gas |
| Legal entity | Green Energy (UK) Limited | Eni Plenitude SpA Societa Benefit |
| Headquarters | United Kingdom | Italy |
| Founded | 2001Lower | 2022 |
| Support channels | Phone, Email, Chat, Help centreCovers more | Phone, Chat, Help centre |
Broadband
| Fact | 100Green | Eni Plenitude |
|---|---|---|
| Technology | Not confirmed | Fttp, Fttc |
| Top download speed (Mbps) | Not confirmed | 2,500 |
| Upload speed (Mbps) | Not confirmed | 1,000 |
| Price from | Not confirmed | €19.90 |
| Reference plan prices | Not confirmed | Fibra existing energy customers: 19.90 EUR/month, 2500 Mbps, no term; Fibra plus Energy new customers: 19.90 EUR/month, 2500 Mbps, no term; Fibra only new customers: 25.90 EUR/month, 2500 Mbps, no term |
| Contract length | Not confirmed | 1 |
| Setup fee | Not confirmed | €39 |
| Price after contract | Not confirmed | €25.90 |
| Exit fee terms | Not confirmed | No penalties; 25.90 EUR deactivation fee within 24 months, 16.90 EUR with energy discount |
| Router | Not confirmed | Modem Wi-Fi 7 included |
| Address checker | Not confirmed | https://eniplenitude.com/offerta/casa/fibra-internet |
Where each stands against the rest
| Fact | 100Green | Eni Plenitude | Median |
|---|---|---|---|
| Unit rate | Not confirmed | €0.172above the median | €0.17 |
| Standing charge | Not confirmed | €144highest quarter | €14.99 |
| Renewable share | 100%at the median | 100%at the median | 100% |
| Export rate | £0.12at the median | Not confirmed | £0.12 |
| Customers | Not confirmed | 11,000,000highest quarter | 850,000 |
Median across 58 listed providers.
Pros and cons
100Green
Pros
- Renewable electricity at 100%, with the supply behind it coming from a power purchase agreement.
- Own generation is rewarded: exports are paid at £0.12.
- Both fuels come from one supplier, with electricity and gas covered on the same account.
Cons
- A smart meter is required for the electric vehicle tariff, so meter status decides who can take that plan.
- Fixed terms run for 12 months only, so no longer fixed term is listed for anyone wanting a rate locked for years.
- Supply covers GB only, so a household outside that market has to look elsewhere.
Eni Plenitude
Pros
- The €0 exit fee ranks 1 of 29 brands, the clearest advantage in the set here.
- Renewable share of 100% on a certificate basis, so the green claim names how it is certified.
- Electricity and gas on the same account, electricity and gas, with fixed terms of 24 months if you want rate certainty.
Cons
- The €144 standing charge is the weak point, ranking 16 of 16 and sitting above the €14.98 market median.
- The fibre line carries a €39 setup fee, where the median setup fee across the plans listed here is €0.
- Broadband-only new customers pay €25.90 rather than the €19.90 rate offered with an energy contract.
Who each suits
100Green
Who it suits
- Households in GB that want renewable electricity and gas from one supplier.
- EV drivers who already have a smart meter or are ready to have one fitted.
- Anyone who may move mid-term and wants a free exit fee.
Who should look elsewhere
- Powerpeers, for a dynamic tariff: 100Green's list is fixed, variable and green, while Powerpeers runs dynamic, fixed and variable.
- Vattenfall, for a household that wants only fixed, green and variable choices, since Vattenfall lists fixed, green and variable without the vehicle and time-of-use options.
Eni Plenitude
Who it suits
- Italian households that want electricity and gas on a single fixed deal with a €0 exit fee.
- Existing energy customers adding fibre, who get the €19.90 entry rate rather than €25.90.
- People who want a support mix of phone, chat and help centre with a phone line in it.
Who should look elsewhere
- Buyers after hourly or dynamic pricing rather than a fixed rate: Powerpeers lists dynamic, fixed and variable.
- Shoppers set on prepay or a separate green choice: Electricity Ratings lists fixed, ev and time of use.
- Households looking for time-of-use or electric vehicle tariffs: Endesa lists fixed, time of use and ev.
Country by country
| Country | 100Green | Eni Plenitude |
|---|---|---|
| France | No | Yes |
| Greece | No | Yes |
| Italy | No | Yes |
| Portugal | No | Yes |
| Slovenia | No | Yes |
| Spain | No | Yes |
| United Kingdom | Yes | No |
Questions about each
100Green
What does 100Green supply?+
100Green covers both fuels, with electricity and gas available from the same supplier, so a household using both does not need two providers. Renewable supply applies to the electricity side, and gas is bundled into the same account for homes that want one relationship.
Is the electricity genuinely renewable?+
Electricity is listed as 100% renewable, and the basis for that claim is a power purchase agreement. The green offer is tied to contracted renewable generation, which is the part buyers of green tariffs tend to ask about before they switch.
Eni Plenitude
Is there an exit fee on the energy contract?+
No penalty charge applies to the energy tariff, where the exit fee is €0. Broadband is treated separately: the fibre line carries a deactivation charge if you cancel within the initial period, and that charge is reduced when you hold an energy contract with the same supplier. Leaving the energy side is simple; leaving the fibre side is not free.
What do I actually pay on the energy side?+
The unit rate is €0.17 and the standing charge is €144, and the standing charge applies whatever the household uses. Low-usage homes feel that fixed part harder, so the same tariff can look different from home to home. Both fuels, electricity and gas, sit on the same contract.
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