Updated September 30, 2026 · TariffCue Editorial Team
100Green vs Endesa
What sets them apart
| Compare |  100Green |  Endesa |
|---|---|---|
| Fixed terms | 12 | 12, 36, 60Covers more |
| Exit fee | £0 | €0 |
| Export rate | £0.12 | €0.060 |
| Markets | GB | ES, PT |
| Unit rate | Not confirmed | €0.12 |
| Standing charge | Not confirmed | €2.85 |
| Renewable share | 100% | Not confirmed |
| Renewable basis | Ppa | Not confirmed |
| Smart meter required | Yes | Not confirmed |
| Regions served | Not confirmed | Spain, Canarias, Baleares |
| Customers | Not confirmed | 12,700,000 |
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Key differences
- Endesa scores higher overall: 9.5 vs 9.3.
- Founded is lower at Endesa: 1944 vs 2001.
- Endesa is available in 1 more country.
- Tariff types: only 100Green offers Variable, Green.
- Fixed terms: only Endesa offers 36, 60.
- Markets: only 100Green offers GB.
- Markets: only Endesa offers ES, PT.
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.
Endesa
Endesa suits Spanish households that want a fixed term they can leave early at no cost, with electricity and gas on a single account across Spain, Canarias and Baleares. It serves 12,700,000 customers, handles support on email, chat and phone and charges an exit fee of €0.
Score breakdown
| Area | 100Green | Endesa |
|---|---|---|
| Cost | 9.4Exit fees are £0, and the supplier ranks 1 of 29 brands on that measure. | 9.5HigherUnit rate of €0.12 and standing charge of €2.85 keep costs competitive, with an exit fee of €0. |
| Offer | 9.4Tariffs cover fixed, variable and green, a wider set than Octopus Energy at fixed, variable and green or Vattenfall at fixed, green and variable. | 9.4Electricity and gas under electricity and gas, plus a tethered charger at €1,099 with installation included. |
| Trust | 8.9Trades as Green Energy (UK) Limited and has been trading since 2001, based in GB. | 9.8HigherTrading since 1944 with support on email, chat and phone and a trust score of 9.8. |
How they place
| Ranking | 100Green | Endesa |
|---|---|---|
| Smart and dynamic electricity tariffs | 8 of 43 | 7 of 43 |
| Energy tariffs without exit fees | 5 of 19 | 4 of 19 |
Every fact side by side
| Fact | 100Green | Endesa |
|---|---|---|
| Tariff types | Fixed, Variable, Green, Ev, Time of useCovers more | Fixed, Time of use, Ev |
| Fuels | Electricity, Gas | Electricity, Gas |
| Legal entity | Green Energy (UK) Limited | ENDESA ENERGIA S.A.U. |
| Headquarters | United Kingdom | Spain |
| Founded | 2001 | 1944Lower |
| Support channels | Phone, Email, Chat, Help centre | Email, Chat, Phone, Help centre |
EV charging
| Fact | 100Green | Endesa |
|---|---|---|
| Charger price | Not confirmed | €1,099 |
| Installation included | Not confirmed | Yes |
| Charging power (kW) | Not confirmed | 7.4 to 22 |
| Tethered cable | Not confirmed | Yes |
| Tariff integration | Not confirmed | Tarifa Recarga en Casa |
| Mobile app | Not confirmed | Yes |
| Warranty | Not confirmed | 3 years |
Where each stands against the rest
| Fact | 100Green | Endesa | Median |
|---|---|---|---|
| Unit rate | Not confirmed | €0.12lowest quarter | €0.17 |
| Standing charge | Not confirmed | €2.85lowest quarter | €14.99 |
| Renewable share | 100%at the median | Not confirmed | 100% |
| Customers | Not confirmed | 12,700,000highest 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.
Endesa
Pros
- Exit fee of €0 means a fixed term can be ended early without a charge, which is unusual in this group.
- Unit rate of €0.12 and standing charge of €2.85 sit at the competitive end of the suppliers listed here.
- A tethered home charger costs €1,099 with installation included, gives power of 7.4 to 22 kW and carries a warranty of 3 years.
Cons
- Tariff choice is narrower than some rivals: fixed, time of use and ev covers fixed, time-of-use and EV, while Powerpeers lists dynamic, fixed and variable.
- A green tariff does not appear in fixed, time of use and ev, though Electricity Ratings includes fixed, ev and time of use.
- Coverage is limited to Spain, Canarias and Baleares, so households in other markets need a different supplier.
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.
Endesa
Who it suits
- Households in Spain, Canarias or Baleares that want electricity and gas from one supplier with an exit fee of €0.
- EV owners who want a tethered charger fitted at home and linked to the electricity tariff.
- Customers who expect phone help, since email, chat and phone includes phone and chat alongside email.
Who should look elsewhere
- Powerpeers readers who want a dynamic or variable tariff, since dynamic, fixed and variable lists both and fixed, time of use and ev does not.
- Anyone set on a green tariff, which Electricity Ratings offers in fixed, ev and time of use but Endesa does not list.
- Households outside Spain, Canarias and Baleares, and readers who prefer the fixed-only setup of Base Power Company in fixed.
Country by country
| Country | 100Green | Endesa |
|---|---|---|
| Portugal | 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.
Endesa
Does it cost anything to leave an Endesa contract early?+
The exit fee listed for the Conecta de Endesa plan is €0, so ending a fixed term early carries no charge. That stands out among the suppliers in this comparison, several of which price a fee for switching. It makes Endesa easier to move away from if wholesale prices move against you later.
What does a unit of electricity cost from Endesa?+
The unit rate on Conecta de Endesa is €0.12, with a standing charge of €2.85 added to the bill. In this comparison the unit rate ranks 6 of 23 and the standing charge 3 of 16, putting both figures near the competitive end of the group.