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Release 14.1

Interruptible loads

Information on interruptible loads

Product type Number of framework agreements Total capacity of all PTUs [MW]
Immediately interruptible loads 2 251.00
Quickly interruptible loads 5 885.00

In principle, it is possible to prequalify installations as quickly interruptible loads (SNL) if they have already been prequalified as immediately interruptible loads (SOL). In this case, the prequalified technical unit (PTU) is listed both as SOL and as SNL, along with its capacity. However, that unit is only entitled to a single surcharge for one of both products within a single month.

Ordered values of interruptible loads

Joint call for tenders for interruptible loads

With the amendment of the Energy Industry Act (EnWG) of 20 December 2012 and by means of the  "Ordinance on Interruptible Load Agreements (AbLaV)"  , the legislator made it possible to also contractually oblige interruptible load suppliers to take the necessary measures to maintain grid and system security.

For the purpose of the Ordinance, interruptible loads are defined as large consumption units which are connected to the high and extra high voltage grid, nearly continuously consume a large volume of electricity and which can, when called upon, reduce or interrupt their demand on short notice and for a fixed minimum duration thanks to the nature of their production process.

In accordance with the AbLaV, the German transmission system operators issue a call for tenders each month for 1,500 MW of immediately interruptible loads (SOL) and an equal volume of quickly interruptible loads (SNL) through the TSOs' joint tendering platform: www.regelleistung.net.

To participate in a tendering procedure, each provider that has breaking capacity at its disposal and seeks to offer it on the market, needs to successfully participate in the prequalification procedure of the TSO it is connected to. This is a prerequisite for the subsequent framework agreement with the relevant connecting TSO.

Below you can find an overview of the relevant framework conditions for the tendering procedure of interruptible loads:

  • Tendering period: monthly
  • Products: immediately interruptible loads (SOL) and quickly interruptible loads (SNL)
  • Tendering volumes: 1,500 MW of SOL and SNL each
  • Offer size: minimum tender quantity (minimum lot size) = 50 MW and maximum tender quantity = 200 MW
  • Tendering dates: according to the tendering calendar
  • Offer options: provision of a breaking capacity (in accordance with ยง 5 section 1 no. 3 of the AbLaV) for:
    • at least 15 minutes at any given time, several times a day at different intervals for a duration of up to one hour per day, at least four times a week
    • continuously for at least four hours at any given time, once every seven days
    • continuously for at least eight hours at any given time, once every 14 days
  • Activation:
    • SOL: automatically frequency-controlled within the second when the level drops below a predefined grid frequency and remotely controlled without delay by the transmission system operator (immediately interruptible loads)
    • SNL: remotely controlled within 15 minutes by the transmission system operator

The calls for tenders, anonymous tendering results as well as the publications regulated in the framework agreement and in the AbLaV are published on the freely accessible part of the Internet platform.

Documents for the prequalification of interruptible loads can be found here:

Documents for the framework agreement between the interruptible load supplier and the connecting TSO can be found here:

Further information as well as the relevant contacts can be found on your connecting TSO's website:

www.50hertz.com/de/abla.htm
www.amprion.net/ablav
www.transnetbw.de/de/strommarkt/systemdienstleistungen/abschaltbare-lasten
www.tennettso.de/site/Transparenz/veroeffentlichungen/abschaltbare-lasten