Updated September 30, 2026 · TariffCue Editorial Team
100Green vs Alperia
100Green vs Alperia: the differences
| Compare |  100Green |  Alperia |
|---|---|---|
| Fixed terms | 12 | 12, 36, 60Covers more |
| Exit fee | £0 | €0 |
| Renewable basis | Ppa | Certificates |
| Markets | GB | IT |
| Unit rate | Not confirmed | €0.13 |
| Standing charge | Not confirmed | €109 |
| Export rate | £0.12 | Not confirmed |
| Smart meter required | Yes | Not confirmed |
| Regions served | Not confirmed | Trentino Alto Adige |
| Customers | Not confirmed | 525,000 |
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 Chat.
- Founded is lower at 100Green: 2001 vs 2016.
- Tariff types: only 100Green offers Ev, Time of use.
- Fixed terms: only Alperia offers 36, 60.
- Markets: only 100Green offers GB.
- Markets: only Alperia offers IT.
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.
Alperia
Alperia is a good fit for households in Trentino Alto Adige that want renewable electricity with free exit fees, so moving supplier later costs nothing. Its unit rate of €0.13 keeps bills in line with the wider market rather than at the cheapest end.
Score breakdown
| Area | 100Green | Alperia |
|---|---|---|
| Cost | 9.4HigherExit fees are £0, and the supplier ranks 1 of 29 brands on that measure. | 9.0Exit fees are free and the unit rate sits mid-table at €0.13, ahead of most rivals on leaving early. |
| 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. | 9.0Green supply is 100% renewable alongside fixed and variable plans, with a mobile app for managing usage. |
| Trust | 8.9HigherTrades as Green Energy (UK) Limited and has been trading since 2001, based in GB. | 8.2Operating since 2016 with 525,000 customers and support on email, phone and help centre. |
Pick 100Green if, pick Alperia if
Pick 100Green if cost, offer, and trust matter most.
Pick Alperia if fixed terms matter most.
Availability and regulation
| Country | 100Green | Alperia |
|---|---|---|
| Headquarters | United Kingdom | Italy |
What we checked
100Green
- 100green.com: 13 facts, checked September 30, 2026
Alperia
- alperia.eu: 13 facts, checked September 30, 2026
- alperiagroup.eu: 2 facts, checked September 30, 2026
How they place
| Ranking | 100Green | Alperia |
|---|---|---|
| Green energy suppliers | 12 of 56 | 24 of 56 |
| Energy tariffs without exit fees | 5 of 19 | 12 of 19 |
Every fact side by side
| Fact | 100Green | Alperia |
|---|---|---|
| Tariff types | Fixed, Variable, Green, Ev, Time of useCovers more | Fixed, Variable, Green |
| Fuels | Electricity, Gas | Electricity, Gas |
| Legal entity | Green Energy (UK) Limited | ALPERIA SMART SERVICES SRL |
| Headquarters | United Kingdom | Italy |
| Founded | 2001Lower | 2016 |
| Support channels | Phone, Email, Chat, Help centreCovers more | Email, Phone, Help centre |
EV charging
| Fact | 100Green | Alperia |
|---|---|---|
| Installation included | Not confirmed | Yes |
| Solar divert | Not confirmed | Yes |
| Mobile app | Not confirmed | Yes |
Where each stands against the rest
| Fact | 100Green | Alperia | Median |
|---|---|---|---|
| Unit rate | Not confirmed | €0.13lowest quarter | €0.17 |
| Standing charge | Not confirmed | €109highest 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 | 525,000below the median | 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.
Alperia
Pros
- Exit fees are €0, so leaving early carries no charge on the green plans
- Green supply runs at 100% renewable, backed by certificates
- A €0.13 unit rate that ranks ahead of many suppliers on unit rate alone
Cons
- Supply is limited to Trentino Alto Adige, so most of the country cannot switch to it
- The standing charge of €109 ranks mid-table rather than near the cheapest
- Green claims rest on certificates rather than on the supplier's own generation
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.
Alperia
Who it suits
- Households in Trentino Alto Adige that want renewable electricity at a fair unit rate
- Anyone planning to move house or supplier within the fixed term, since exit fees are €0
- EV owners who want solar divert and installation included with their charger
Who should look elsewhere
- Households outside Trentino Alto Adige, since it serves IT only
- EV drivers who want a time of use tariff, which Powerpeers and Endesa both list
- Shoppers chasing the lowest unit rate in the market rather than a fair mid-table one
Country by country
| Country | 100Green | Alperia |
|---|---|---|
| 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.
Alperia
Does it cost anything to leave Alperia early?+
No. Exit fees on the green plans are €0, so you can switch supplier before the term ends without a charge. Fixed terms still run for 12, 36 and 60, but the commitment does not come with a penalty for walking away from it.
How renewable is the green electricity?+
The green plans are described as 100% renewable. That claim is backed by certificates rather than by electricity the supplier generates itself, which is worth weighing if you prefer supply from owned generation.