Vattenfall and E.ON Step In Automatically: What Happens If Your Hamburg Energy Provider Goes Bankrupt

The Official Rule

It’s a genuinely recurring risk, not a one-off scare story specific to some distant part of Germany: energy providers offering aggressive discount rates have collapsed repeatedly in recent years, squeezed between fixed-price customer contracts and volatile wholesale energy costs. According to figures the Bundesnetzagentur gave to Business Insider Deutschland, 39 energy suppliers shut down nationwide in 2021 alone, roughly double the 2016-2020 average of around 20 a year. What matters for your Hamburg household, though, is that German energy law was built specifically to make sure a provider’s insolvency never actually interrupts your electricity or heating. According to the Verbraucherzentrale’s official guidance, the moment a provider stops delivering, the local Ersatzversorger automatically takes over under a mechanism called Ersatzversorgung, and the network operator (Netzbetreiber) is the one that notifies you this has happened.

In Hamburg, that fallback company isn’t Hamburg Energie, the city’s own green brand. hamburg.de’s own official page listing the region’s basic suppliers names Vattenfall Europe Sales GmbH as the electricity Ersatzversorger and E.ON Energie Deutschland GmbH as the gas Ersatzversorger, the same two companies that already run Hamburg’s ordinary Grundversorgung default. If your actual provider goes insolvent, you don’t fall back to Hamburg’s own city-owned utility, you fall back to Vattenfall or E.ON, automatically and without applying for anything.

This fallback is deliberately not a bargain, and it isn’t meant to be permanent. Under § 38 EnWG, Ersatzversorgung is capped at three months from when it starts. The supplier can also adjust its Ersatzversorgung prices on the 1st and 15th of any calendar month without the notice period a normal contract would require, a rule the Bundesnetzagentur’s own Ersatzversorgung page confirms directly, which is exactly why it’s structured as a bridge rather than something to settle into. The same page also confirms you can switch away to any provider of your choice at any point during those three months with no notice period required at all. If the three months pass and you haven’t actively signed a new contract, you’re automatically rolled over into ordinary Grundversorgung, at Vattenfall’s or E.ON’s standard Hamburg rates, not left in a gap and not cut off, just moved into the same default tariff you’d have fallen into if you’d never signed a contract at all.

What genuinely needs your attention is financial, not logistical. The Verbraucherzentrale’s guidance points to a handful of concrete steps: cancel your SEPA direct debit or standing order to the now-insolvent provider in writing, so no further payments go out to a company that may never deliver services for them again. Read and document your own meter reading, reporting it to the network operator and your new Ersatzversorgung supplier, since that number is what separates your final bill from the old provider and your first bill from the new one. And get the actual start date of your Ersatzversorgung confirmed in writing, which matters if there’s ever a dispute about which company billed you for which period.

Any prepaid credit, bonus, or Guthaben with the collapsed provider doesn’t come back automatically. It has to be formally registered with the insolvency administrator handling the case, the same process any other creditor would go through, and whether you actually recover anything depends on what’s left in the insolvency estate. Skipping that registration step guarantees you get nothing back, which is why it’s worth doing even for a modest amount.

Photo by Andy Lee on Pexels

Hamburg’s Own Cautionary Tale: Smiling Green Energy

This isn’t a risk that only ever plays out somewhere else. In October 2021, Hamburg’s own eco-electricity provider, Smiling Green Energy, trading under the brand Natürlich-grün-Strom and supplying roughly 1,500 private and commercial customers with renewable-sourced power, filed for insolvency. The Amtsgericht Hamburg appointed attorney Dr. Tobias Brinkmann as insolvency administrator that same month. According to WirtschaftsWoche’s contemporary coverage, it was the second energy supplier to collapse within a single week at the start of that autumn’s price spike, following Brandenburg-based Otima Energie AG days earlier, and commentators at the time already warned it likely wouldn’t be the last.

The cause was exactly the mechanism described above: Smiling Green Energy had locked in lower fixed rates with its customers while having to buy the actual electricity on a volatile wholesale spot market, a gap that became unsustainable the moment prices spiked. Its own roughly 1,500 customers went through precisely the process this page describes, automatic Ersatzversorgung from Hamburg’s designated fallback supplier, a limited window to switch to a new contract retroactively, and a formal claim process for any prepaid balance with the insolvency administrator, according to guidance published for affected Smiling Green Energy customers specifically. It’s a genuinely concrete Hamburg precedent, not a hypothetical drawn from national statistics, that the same federal mechanism protecting your supply today already had to work for households in this city.

The Six-Week Window Nobody Mentions

Most explanations of Ersatzversorgung stop at “it’s capped at three months,” which makes it sound like your only real lever is waiting out the clock. There’s a sharper option most newcomers never hear about. According to grid operator FAQ guidance on the rule, a switch out of Ersatzversorgung, meaning a new supply contract with a provider of your own choosing, can take effect retroactively if you conclude it within the first six weeks after Ersatzversorgung began. Concretely, that means the new contract’s presumably lower rate gets billed for the whole period, including the weeks you were technically sitting in the pricier Ersatzversorgung tariff, rather than you paying the fallback rate for those weeks regardless.

This isn’t a generic rule that only applies in theory. The same six-week retroactive right was explicitly confirmed for Smiling Green Energy’s own affected customers after its October 2021 collapse: anyone who signed with a new provider within six weeks of falling into Ersatzversorgung could have that new contract backdated to the actual start, sidestepping the higher fallback price almost entirely. After six weeks, switching is still always possible, with no notice period required at any point during the three-month cap, but it stops being retroactive: from that point, whatever you consumed under Ersatzversorgung gets billed at Ersatzversorgung’s own rate, and only your consumption from the switch date onward moves to the new contract.

Step by Step

1. Confirm your supply hasn’t actually been interrupted, it hasn’t, Ersatzversorgung through Vattenfall (electricity) or E.ON (gas) starts automatically the moment your provider stops delivering.
2. Cancel your SEPA direct debit or standing order to the collapsed provider immediately, in writing, so no further payments go out.
3. Read and document your own meter reading, reporting it to both the network operator and your new Ersatzversorgung supplier.
4. Get your Ersatzversorgung start date confirmed in writing, since that date is what makes a retroactive switch even possible within the six-week window.
5. Compare tariffs and sign a new contract within six weeks of that start date if you want the new rate applied retroactively rather than only capping how long the expensive fallback lasts.
6. Register any prepaid credit or signup bonus with the insolvency administrator as soon as you know who’s handling the case, rather than assuming it’s simply lost, and don’t wait past three months either way, since standard Grundversorgung rates take over automatically after that.

Compliance Note

This page explains the general framework around energy provider insolvency and Ersatzversorgung under the EnWG, but this is not legal or financial advice, and specific timelines, prices, or claim procedures can vary by case. For your specific situation, confirm current details with Hamburger Energienetze, Vattenfall, E.ON, or the Verbraucherzentrale Hamburg.