Updated September 30, 2026 · TariffCue Editorial Team
Eni Plenitude vs OiSTER
Where Eni Plenitude and OiSTER differ
| Compare |  Eni Plenitude |  OiSTER |
|---|---|---|
| Top download speed (Mbps) | 2,500Higher | 25 to 954 |
| Upload speed (Mbps) | 1,000Higher | 23 to 94 |
| Price from | €19.90 | DKK 18 |
| Reference plan prices | 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 | Basic: 25 kr/md, pay-as-you-go, no binding; Fri tale 100 GB: 18 kr/md promo then 109 kr/md, 100GB, 1 month; Fri tale Fri data: 49 kr/md promo then 199 kr/md, unlimited, 1 month |
| Setup fee | €39 | DKK 0 |
| Price after contract | €25.90 | DKK 279 |
| Exit fee terms | No penalties; 25.90 EUR deactivation fee within 24 months, 16.90 EUR with energy discount | Mobile broadband cancellable anytime with 30 days notice; 5G Internet 6-month tie-in |
| Router | Modem Wi-Fi 7 included | Vantiva Falcon 5G loan router included, must be returned |
| Address checker | https://eniplenitude.com/offerta/casa/fibra-internet | https://oister.dk/internet/#tjekadresse |
| Markets | IT, FR, ES, PT, GR, SI | DK |
| Data cap (GB) | Not confirmed | 10 to 1,000 |
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Key differences
- OiSTER scores higher overall: 9.3 vs 8.8.
- Top download speed (Mbps) is higher at Eni Plenitude: 2,500 vs 25 to 954.
- Upload speed (Mbps) is higher at Eni Plenitude: 1,000 vs 23 to 94.
- Support channels: only OiSTER offers Email.
- Founded is lower at OiSTER: 2008 vs 2022.
- Eni Plenitude is available in 5 more countries.
- Technology: only Eni Plenitude offers Fttp, Fttc.
- Technology: only OiSTER offers 5G.
- Markets: only Eni Plenitude offers IT, FR, ES.
- Markets: only OiSTER offers DK.
Our verdict on each
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.
OiSTER
OiSTER is a rolling Danish MVNO that suits households wanting a month-to-month bill, sim only plans and an unlimited option at DKK 49 a month. It is a weaker choice than the cheapest listings on entry price, so buyers shopping purely on the headline figure should look elsewhere first.
Score breakdown
| Area | Eni Plenitude | OiSTER |
|---|---|---|
| Cost | 8.8Unit rate of €0.17 sits near the €0.17 market median, while the €144 standing charge sits well above it. | 9.8HigherEntry at DKK 18 a month and unlimited at DKK 49, though the Fri tale plans rise on renewal after an introductory rate. |
| Offer | 9.3HigherFixed and variable energy tariffs covering electricity and gas, plus fibre broadband entry €19.90 with 2,500 Mbps download. | 9.1Sim only, eSIM and wifi calling all present, plus a multi line discount, 5G technology and data allowances of 10 to 1,000 GB. |
| Trust | 8.0Founded in 2022 as Eni Plenitude SpA Societa Benefit in IT, with support on phone, chat and help centre. | 8.7HigherA long-standing operator: Hi3G Denmark ApS in DK since 2008, selling as an MVNO rather than a network. |
Where they rank in our lists
| Ranking | Eni Plenitude | OiSTER |
|---|---|---|
| Broadband without a long contract | 5 of 46 | 14 of 46 |
By the numbers
| Fact | Eni Plenitude | OiSTER |
|---|---|---|
| Top download speed (Mbps) | 2,500 | 25 to 954 |
| Upload speed (Mbps) | 1,000 | 23 to 94 |
Also worth a look
Astound has upload speed (mbps) at 5,000, against 1,000 for Eni Plenitude and 23 to 94 for OiSTER.
Astound reviewEvery fact side by side
| Fact | Eni Plenitude | OiSTER |
|---|---|---|
| Technology | Fttp, Fttc | 5G |
| Contract length | 1 | 1 |
| Legal entity | Eni Plenitude SpA Societa Benefit | Hi3G Denmark ApS |
| Headquarters | Italy | Denmark |
| Founded | 2022 | 2008Lower |
| Support channels | Phone, Chat, Help centre | Phone, Email, Chat, Help centreCovers more |
Where each stands against the rest
| Fact | Eni Plenitude | OiSTER | Median |
|---|---|---|---|
| Top download speed (Mbps) | 2,500above the median | 25 to 954lowest quarter | 1,000 |
| Upload speed (Mbps) | 1,000above the median | 23 to 94lowest quarter | 900 |
| Data cap (GB) | Not confirmed | 10 to 1,000below the median | 15 |
Median across 116 listed providers.
Pros and cons
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.
OiSTER
Pros
- The unlimited Fri tale Fri data plan is listed at DKK 49 a month, which ranks 13 of 173 on unlimited price.
- Rolling billing at 1 month, with Basic available pay-as-you-go and no binding period.
- Sim only, eSIM, wifi calling and a multi line discount are all available, on 5G technology.
Cons
- The DKK 18 entry price ranks 43 of 258 on the listings compared, so entry pricing is mid-table rather than the cheapest on offer.
- The Fri tale plans are published at a promotional rate before a higher standard rate, so the ongoing cost on the same plan name is the figure to budget.
- Coverage is limited to DK, so residents outside that market have nothing here to switch to.
Who each suits
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.
OiSTER
Who it suits
- Households in DK that want a rolling monthly bill and can cancel mobile broadband with notice.
- Readers who want unlimited data at DKK 49 a month rather than the cheapest possible entry price.
- Families running more than one line, since a multi line discount applies alongside eSIM setup for a new handset.
Who should look elsewhere
- Anyone who wants to buy from the network operator instead of an MVNO: GETESA, Lonestar Cell MTN and yesss! all sell as networks.
- Shoppers ranking purely on the lowest price from, since DKK 18 sits at position 43 of 258 and yesss! or GETESA belong on the same shortlist for that column.
Country by country
| Country | Eni Plenitude | OiSTER |
|---|---|---|
| Denmark | No | Yes |
| France | Yes | No |
| Greece | Yes | No |
| Italy | Yes | No |
| Portugal | Yes | No |
| Slovenia | Yes | No |
| Spain | Yes | No |
Questions about each
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.
OiSTER
What is the cheapest OiSTER plan and what does it cost?+
The entry price is DKK 18 a month. Basic is the pay-as-you-go option, billed on usage with no binding period, so it works for light use and for anyone who does not want to be tied in. The two Fri tale plans sit above it, one with a capped allowance and one unlimited, so the entry figure suits a phone that lives mostly on wifi.
What will I pay when an introductory price runs out?+
The Fri tale plans are published at a promotional rate first and a higher standard rate afterwards on the same plan name, so the ongoing cost is the standard rate, not the introduction. Basic sidesteps that because it is pay-as-you-go. The unlimited plan, Fri tale Fri data, is listed at DKK 49 a month on the published pricing.
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