Ostrom review

Updated September 30, 2026 · TariffCue Editorial Team · Facts checked September 30, 2026

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Our verdict

Ostrom suits households in its home market that want choice, with 100% renewable electricity, fixed terms of 12 and 24 and a variable option in the same account. The trade-off is support, which runs on chat and help centre, and a footprint of DE.

Key facts

Best for
Households in its home market that want several tariff types without moving supplier.
Fixed terms
12, 24 (Source, checked September 30, 2026)
Standing charge
€6 (Source, checked September 30, 2026)
Renewable share
100% (Source, checked September 30, 2026)
Renewable basis
Certificates (Source, checked September 30, 2026)
Smart meter required
Yes (Source, checked September 30, 2026)
Customers
100,000 (Source, checked September 30, 2026)
Markets
DE (Source, checked September 30, 2026)
Legal entity
Ostrom GmbH (Source, checked September 30, 2026)
Headquarters
Germany (Source, checked September 30, 2026)
Founded
2021 (Source, checked September 30, 2026)
Support channels
Chat, Help-centre (Source, checked September 30, 2026)
Tariff types
Variable, Fixed, Dynamic, Ev, Green
Fuels
Electricity
Official website
ostrom.de

Apps and profiles

Elsewhere
LinkedInXTrustpilotinstagram.com

Pros and cons

Pros

  • Broad choice under one account: variable, fixed and dynamic, against the shorter lists at Endesa (fixed, time of use and ev) and Powerpeers (dynamic, fixed and variable).
  • A low standing charge of €6, with a rank of 4 among 16 on that measure.
  • Renewable supply at 100%, with the renewable basis set as certificates.
  • A customer base of 100,000, enough scale to suggest the supplier will still be trading when a fixed term ends.

Cons

  • Support runs on chat and help centre, so anyone who needs a phone line has fewer routes to reach a person.
  • Dynamic pricing asks for a smart meter to be in place, so a home that has none fitted is left choosing among the fixed, variable, green and EV tariffs in variable, fixed and dynamic.
  • The fuels listed are electricity, so a household running gas as well needs a second supplier.
  • The footprint is DE, so there is nothing to switch to for readers based in another country.
Ostrom

Ready to try Ostrom?

Scored 8.9 / 10 by TariffCue.

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Who it suits

  • Households that want to pick between variable, fixed and dynamic pricing without moving supplier, given the range in variable, fixed and dynamic.
  • EV owners who want a dedicated tariff in the same account as their everyday rate, listed in variable, fixed and dynamic.
  • Green electricity buyers content with certificates as the basis, which is how the label is set at certificates.

Who should look elsewhere

  • Shoppers after time-of-use or prepay options, who can compare electricity-ratings at fixed, ev and time of use.
  • Readers who want a simpler shortlist, since Powerpeers lists dynamic, fixed and variable against the wider Ostrom range of variable, fixed and dynamic.
  • Anyone settled on fixed, time-of-use and EV tariffs only, who may prefer the narrower Endesa set of fixed, time of use and ev.

Core features

Renewable electricity leads the range, with the green tariff put at 100% renewable. The dynamic option comes with a condition attached, since a smart meter is required before a household can use hourly pricing, and until that meter is in place the cheaper hours are of no use. Set against both points is a customer base of 100,000, which gives the brand weight in a market where newer suppliers come and go. The practical reading is plain enough: a home that already has a meter can pick from every line in variable, fixed and dynamic, while a household that has yet to fit one is choosing between the fixed, variable, green and EV tariffs on offer.

The company behind it

The contract is with Ostrom GmbH, a company founded in 2021 and headquartered in Germany, so it is a recent arrival on a market long served by older names. Service runs on chat and help centre rather than a phone line, which suits a digital-first model and puts the work of chasing an answer onto the customer. That shape works for readers who are comfortable in a help centre or chat window, and it is felt most by anyone holding a complicated billing question or a meter reading query. Recency cuts both ways: the company is young, and the customer base is the strongest reassurance on offer.

How Ostrom compares

Where Ostrom is available

Available
Germany

Countries from the brand (Source, checked September 30, 2026)

Frequently asked questions

How much is the Ostrom standing charge?+

The published standing charge is €6, and Ostrom sits at 4 on that measure among 16 brands tracked. For a household using little power, the standing charge carries more of the bill than the unit rate, so it is worth weighing before a fixed tariff is signed.

Does Ostrom sell a dynamic tariff?+

Yes, dynamic pricing is part of variable, fixed and dynamic, and a smart meter is required to sit on it. A home that has yet to fit a meter is limited to the other tariffs in the range, and anyone hoping to shift usage into cheaper hours will not get that chance until the meter is in place.

Is Ostrom's electricity renewable?+

The green tariff is put at 100% renewable, and the renewable basis is certificates. Certificates are a different proposition from a supplier generating its own power, so buyers who weight that difference heavily should weigh it before switching and decide which they care about more.

Which countries does Ostrom supply?+

Ostrom operates in Germany, and the contract is with Ostrom GmbH. A household sitting outside that market will not find a product to switch to here, so readers elsewhere should start with a supplier that sells in their own country.

How do I reach Ostrom?+

Support runs on chat and help centre, and a phone line is not part of that list. Anything better handled by voice, such as a disputed bill or a meter reading query, has to go through chat or the help centre, which suits readers who are comfortable with written support.

How long are the fixed terms?+

Fixed terms run 12 and 24, so the commitment can be kept short or stretched longer. The rest of the range in variable, fixed and dynamic includes a variable option, which suits anyone who would rather hold no term at all and follow the market instead.

How big is Ostrom?+

The published customer base is 100,000, which puts Ostrom above a trial-stage entry and below a long-established incumbent. For a new switcher, that scale is a reasonable signal that the company will still be trading when a fixed term ends and renewal prices are set.

Does Ostrom sell gas as well?+

No. The fuels listed are electricity, so a household running both electricity and gas ends up with a second supplier for the gas side. Readers who want both fuels under one account should compare suppliers that carry the pair rather than pairing it here.

Sources

  • ostrom.de checked September 30, 2026

    Backs: Customers, Tariff types

    “Over 100,000 clients trust Ostrom”

  • ostrom.de/en/about-us checked September 30, 2026

    Backs: Founded, Markets

    “Matthias and Karl founded Ostrom in January 2021”

  • ostrom.de/en/dynamic-pricing checked September 30, 2026

    Backs: Smart meter required

    “To use a dynamic tariff, you'll need a smart meter”

  • ostrom.de/en/electricity-labeling checked September 30, 2026

    Backs: Renewable basis, Renewable share

    “Ostrom liefert 100 % Strom aus erneuerbaren Energien”

  • ostrom.de/en/fixer-tarif checked September 30, 2026

    Backs: Fixed terms

    “12-month or 24-month price guarantee”

  • ostrom.de/en/imprint checked September 30, 2026

    Backs: Headquarters, Legal entity

    “Registered Office - Berlin, Germany”

  • ostrom.de/en/our-tariff checked September 30, 2026

    Backs: Fuels, Standing charge, Support channels

    “100 % certified green electricity”

Compiled from 7 source pages, checked September 30, 2026. We did not open an account.

Ostrom

Ostrom

Households in its home market that want several tariff types without moving supplier.

8.9/10See alternatives

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