Sudstroum: offers, prices and customer service in June 2026

Sudstroum is a 100% green electricity supplier in Luxembourg with fully digital management. A public company owned by the City of Esch-sur-Alzette, it is also the operator of the Esch electricity network. It supplies electricity nationwide, with one of the lowest standing charges on the market. Here’s the essentials: positioning, offers, contact, what to do in an outage, and our verdict.

Overview and positioning of Sudstroum

Born in 2007 from an EU directive separating network and supply, Sudstroum took over the management of the Esch-sur-Alzette electricity network. Today it is both a network operator (for the Esch area) and a 100% green electricity supplier active nationwide, known for its low standing charge and digital management.

Sudstroum’s strengths:

• ✓ 100% green electricity — from hydro and wind, guaranteed by origin certificates.
• ✓ A competitive pricing policy — one of the lowest monthly standing charges on the market.
• ✓ Fully digital management — sign-up, billing and tracking online (ideal for digitally comfortable households).
• ✓ Local public roots — owned by the City of Esch, with local service and solid network infrastructure.

Good to know

Sudstroum supplies electricity only (no gas). Its telecom services (Internet & TV) are limited to Esch-sur-Alzette: outside Esch you can only subscribe to electricity. To check it’s the best offer for your profile, compare with other suppliers on our electricity comparator.

Sudstroum offers in June 2026

Sudstroum offers two 100% green electricity contracts, at a uniform rate nationwide. As prices change, find up-to-date rates and the comparison with other suppliers on our comparator.

• ✓ Terra Online — 100% green electricity (hydro + wind), online management, low standing charge.
• ✓ Terra Invest Online — the same green electricity, with a share dedicated to funding new local renewable installations.

→ Compare Sudstroum and competing electricity offers

How to contact Sudstroum customer service?

For any commercial, contract or billing question:

• ✓ By phone — on +352 26 783 787-686.
• ✓ By email — [email protected].
• ✓ Online — via the contact form.

Points of sale (Esch-sur-Alzette): Head office — 11, rue de Luxembourg, L-4220 Esch-sur-Alzette · Belval Plaza agency — 14, Avenue du Rock’n’Roll, L-4361 Esch-sur-Alzette.

What to do in case of an outage or problem?

Sudstroum’s special case: in Esch-sur-Alzette, Sudstroum itself operates the distribution network. Elsewhere in Luxembourg, the network is run by Creos. The right step therefore depends on your municipality.

Good to know: switching supplier never causes an outage. Supply is guaranteed by the network operator, whatever your supplier.

The history of Sudstroum in Luxembourg

Sudstroum’s story began in 2007, driven by the EU directive requiring municipalities to outsource energy supply. As early as 2008, Sudstroum took over all of the City of Esch’s customers and the management of the municipal electricity network, then progressively extended its electricity supply nationwide.

Over the years, the supplier has positioned itself as a player committed to renewables: launch of an energy-advice service, financing solutions for solar PV, and continuous investment in the network and local green generation, notably through its Terra Invest Online plan that lets households support the energy transition.

Frequently asked questions — Sudstroum

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