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Documentation Index

Fetch the complete documentation index at: https://docs.nomos.energy/llms.txt

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§14a EnWG governs the relationship between a household and its grid operator (Verteilnetzbetreiber, VNB) when that household runs a “controllable consumption device” (steuerbare Verbrauchseinrichtung) over 4.2 kW. Heat pumps, wallboxes, home batteries, and AC units all qualify. Under the BNetzA ruling BK6-22-300, every VNB is obliged to throttle these devices to maintain grid stability when needed and, in exchange, has to grant the customer a reduction on their grid fees.

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The two paths

The customer chooses one of two paths.

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Module 1, optionally with Module 3

Module 1 is a flat annual deduction on the base grid fee, available to anyone with a registered §14a-eligible device. For a heat pump customer consuming 5,000 kWh/year, it’s worth around 120 to 155 EUR/year net by the BNetzA formula 80 EUR + (Standard-AP × 3,750 kWh × 0.2). Module 3 stacks on top and adds a time-variable grid fee with three windows (low, standard, peak). It can be worth another 100 to 200 EUR/year if the customer plans high-demand hours around the cheap windows. Module 3 requires an intelligent metering system (iMSys).

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Module 2, on its own

A 60% reduction on the variable (kWh) grid fee, applied through a separate sub-meter behind the controllable device. Savings scale with consumption: a wallbox doing 4,000 kWh/year typically saves 150 to 250 EUR/year. Module 2 cannot be combined with Module 1 or Module 3.
For most setups we recommend Module 1 + Module 3 as the default path: it stacks reliably, needs no extra metering hardware beyond the iMSys, and works for any §14a-eligible device.

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How time-variable grid fees work (Module 3)

A Module 3 schedule splits the day into three windows:
  • NT (Niedrigtarif): the cheap window, typically a few ct/kWh below the standard rate.
  • ST (Standardtarif): the regular grid fee, applied outside NT and HT hours.
  • HT (Hochtarif): the expensive window, typically a few ct/kWh above the standard rate.
Each VNB publishes its own windows and price spread; schedules are revised at least annually. Example: Netze BW, 2025/26 (source):
NTSTHT
Time10:00–14:00rest of the day17:00–22:00
Price-7 ct/kWhbaseline+7 ct/kWh
A customer who shifts an EV charge from 18:00 to 12:00 saves around 14 ct/kWh on grid fees.

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How to order

1

Enable the modules on your plan

The plan needs §14a enabled with the modules you want to sell. Plans expose this via the enwg14aOptions configuration; ask Nomos support to enable them. Module 3 additionally requires the customer’s meter to be a smart meter (iMSys); see Smart meters.
2

Show Module 1 in the quote

Pass 14a_module_1=true to Retrieve a quote and the response includes a negative line item for the pauschale Netzentgeltreduktion under the base component. The hosted checkout renders this automatically.
3

Order at checkout, or after the subscription exists

During checkout, include a product_orders entry of type: "14a_enwg" with the modules flagged on Create a subscription. For an existing subscription, call Create a grid fee reduction with the subscription ID and type (e.g. enwg-14a-module-3) in the body.
4

Track status

Use List grid fee reductions with filter[status] to monitor a cohort, or Retrieve a grid fee reduction for a single one.
The quote endpoint only models Module 1. Module 3 doesn’t surface as a quote line item because its savings depend on the customer’s load-shifting behaviour against their VNB’s specific schedule.
Behind the scenes Nomos creates one grid_fee_reduction per requested module and sends an EDIFACT order to the VNB once the subscription is confirmed.

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Status lifecycle

StatusMeaning
intendedOrder has been recorded but the subscription isn’t confirmed yet. No EDIFACT message has been sent.
orderedEDIFACT order has been sent to the VNB. Awaiting their reply.
activatedThe VNB confirmed activation; a valid_from date is set and the reduction is being applied to billing.
endedThe reduction has stopped (subscription ended, or the customer switched modules).
rejectedThe VNB declined the order. Inspect the reason, fix the underlying cause, then re-order.

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Clearing rejections

Rejections are part of normal operation, not an exception. For Module 1, the most common cause is that the controllable consumption device hasn’t been registered with the VNB yet. The customer (or their installer) registers the device through the VNB’s portal; once that’s done, you retrigger the order. You can drive clearing through the API or the dashboard. The dashboard view also shows the rejection reason returned by the VNB and lets you start a clearing conversation directly.
Don’t loop on POST /grid-fee-reductions to “force” a reorder while one is already ordered. The API blocks duplicates and you’ll just generate 400 responses.

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FAQ

Yes. Customers often install a heat pump or wallbox months after switching supplier. Call Create a grid fee reduction against the existing subscription.
Yes. The endpoint refuses a new order only if there’s an active (intended, ordered, or activated) reduction of the same type for the same subscription. Once the previous one is rejected or ended, you can re-order.
Coming soon. Until then, poll the list endpoint with filter[status] or react to subscription.activated to know when an order is eligible to ship.
Module changes are usually triggered by switching devices or moving to a different VNB. The customer (or your support team) reaches out; the underlying mechanism is the same POST /grid-fee-reductions flow plus an end on the previous record.