> ## Documentation Index
> Fetch the complete documentation index at: https://docs.nomos.energy/llms.txt
> Use this file to discover all available pages before exploring further.

# Create a grid fee reduction

> Create a new grid fee reduction for §14a EnWG modules. Not applicable for feed-in subscriptions, which do not pay grid fees.

**Grid fee reduction status:**
- If the subscription is active: grid fee reduction is created with `ordered` status. Order is submitted immediately
- If the subscription is pending: grid fee reduction is created with `intended` status. Order will be submitted once the subscription is confirmed

**Re-ordering after rejection:**
Re-ordering is allowed if the previous grid fee reduction was rejected or ended.

**Ended and terminated subscriptions:**
From `2026-09-08.gauss`, a subscription that has ended is refused with `ended_subscription`, and one with `terminated_at` set with `terminated_subscription`.



## OpenAPI

````yaml /openapi/openapi.curie.json post /grid-fee-reductions
openapi: 3.0.0
info:
  title: Nomos API
  version: 2026-05-27.curie
servers:
  - url: https://api.nomos.energy
    description: production
security: []
tags:
  - name: Plans
  - name: Leads
  - name: Subscriptions
  - name: Customers
  - name: Usage
  - name: Prices
  - name: Invoices
  - name: Smart Meter Orders
  - name: Grid Fee Reductions
  - name: Market Partners
  - name: Events
  - name: Authentication
paths:
  /grid-fee-reductions:
    post:
      tags:
        - Grid Fee Reductions
      summary: Create a grid fee reduction
      description: >-
        Create a new grid fee reduction for §14a EnWG modules. Not applicable
        for feed-in subscriptions, which do not pay grid fees.


        **Grid fee reduction status:**

        - If the subscription is active: grid fee reduction is created with
        `ordered` status. Order is submitted immediately

        - If the subscription is pending: grid fee reduction is created with
        `intended` status. Order will be submitted once the subscription is
        confirmed


        **Re-ordering after rejection:**

        Re-ordering is allowed if the previous grid fee reduction was rejected
        or ended.


        **Ended and terminated subscriptions:**

        From `2026-09-08.gauss`, a subscription that has ended is refused with
        `ended_subscription`, and one with `terminated_at` set with
        `terminated_subscription`.
      requestBody:
        description: The grid fee reduction to create
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/InsertGridFeeReduction'
      responses:
        '200':
          description: The newly created grid fee reduction.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GridFeeReduction'
        '400':
          description: >-
            The request is invalid: a field fails validation, breaks a business
            rule, or the body is not valid JSON. `errors` lists every problem
            with its field.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrBadRequest'
              examples:
                Missing subscription:
                  $ref: '#/components/examples/400-missing-subscription'
                Unknown module type:
                  summary: Unknown module type
                  value:
                    code: BAD_REQUEST
                    message: >-
                      Invalid option: expected one of
                      "enwg-14a-module-1"|"enwg-14a-module-2"|"enwg-14a-module-3"
                    requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
                    docs: >-
                      https://docs.nomos.energy/api-references/errors/BAD_REQUEST
                    errors:
                      - code: invalid_value
                        field: type
                        message: >-
                          Invalid option: expected one of
                          "enwg-14a-module-1"|"enwg-14a-module-2"|"enwg-14a-module-3"
                Body is not valid JSON:
                  $ref: '#/components/examples/400-body-is-not-valid-json'
                Unsupported version header:
                  $ref: '#/components/examples/400-unsupported-version-header'
        '401':
          description: The access token is missing, expired or invalid.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrUnauthorized'
              examples:
                No token:
                  $ref: '#/components/examples/401-no-token'
                Expired token:
                  $ref: '#/components/examples/401-expired-token'
                Invalid token:
                  $ref: '#/components/examples/401-invalid-token'
        '403':
          description: The access token is valid but not allowed to use this endpoint.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrForbidden'
              examples:
                Role without access:
                  $ref: '#/components/examples/403-role-without-access'
                Token without scope:
                  $ref: '#/components/examples/403-token-without-scope-2'
                Customer token without customer:
                  $ref: '#/components/examples/403-customer-token-without-customer'
        '404':
          description: >-
            A resource in the path or the body does not exist or belongs to
            another organization, or the endpoint does not exist in the API
            version of your token.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrNotFound'
              examples:
                Unknown subscription:
                  $ref: '#/components/examples/404-unknown-subscription'
                Endpoint not in your API version:
                  summary: Endpoint not in your API version
                  value:
                    code: NOT_FOUND
                    message: >-
                      There is no POST /grid-fee-reductions in API version
                      2025-12-01.chucky.
                    requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
                    docs: https://docs.nomos.energy/api-references/errors/NOT_FOUND
        '500':
          description: >-
            Something went wrong on our side. Retry later, and send us the
            `requestId` if it persists.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrInternalServerError'
              examples:
                Unexpected error:
                  $ref: '#/components/examples/500-unexpected-error'
      security:
        - Bearer: []
components:
  schemas:
    InsertGridFeeReduction:
      type: object
      properties:
        subscription:
          type: string
          description: ID of the subscription
          example: sub_mi4f0oda6x9m7gcsvjk0ole1
        type:
          type: string
          enum:
            - enwg-14a-module-1
            - enwg-14a-module-2
            - enwg-14a-module-3
          description: Grid fee reduction module type according to §14a EnWG
          example: enwg-14a-module-1
      required:
        - subscription
        - type
    GridFeeReduction:
      type: object
      properties:
        object:
          type: string
          enum:
            - grid_fee_reduction
          description: Type of the object, always 'grid_fee_reduction'
        id:
          type: string
          description: Unique identifier for the grid fee reduction
          example: gfr_mi4f0oda6x9m7gcsvjk0ole1
        subscription:
          type: string
          description: ID of the subscription
          example: sub_mi4f0oda6x9m7gcsvjk0ole1
        type:
          type: string
          enum:
            - enwg-14a-module-1
            - enwg-14a-module-2
            - enwg-14a-module-3
          description: Grid fee reduction module type according to §14a EnWG
          example: enwg-14a-module-1
        status:
          type: string
          enum:
            - intended
            - ordered
            - rejected
            - activated
            - ended
          description: Current status of the grid fee reduction order
          example: activated
        valid_from:
          type: string
          nullable: true
          format: date-time
          description: Start date of the grid fee reduction validity period
          example: '2026-04-01T00:00:00Z'
        valid_until:
          type: string
          nullable: true
          format: date-time
          description: End date of the grid fee reduction validity period
          example: null
        created_at:
          type: string
          format: date-time
          description: Timestamp when the grid fee reduction was created
          example: '2026-03-02T09:15:00Z'
        updated_at:
          type: string
          format: date-time
          description: Timestamp when the grid fee reduction was last updated
          example: '2026-04-01T06:30:00Z'
        customer:
          type: string
          description: ID of the customer the grid fee reduction belongs to
          example: cus_mi4f0oda6x9m7gcsvjk0ole1
      required:
        - object
        - id
        - subscription
        - type
        - status
        - valid_from
        - valid_until
        - created_at
        - updated_at
        - customer
    ErrBadRequest:
      type: object
      properties:
        code:
          type: string
          enum:
            - BAD_REQUEST
          description: The error code related to the status code.
          example: BAD_REQUEST
        message:
          type: string
          description: A human readable message describing the issue.
        requestId:
          type: string
          description: The request id to be used for debugging and error reporting.
          example: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs:
          type: string
          description: The docs related to the error code.
          example: https://docs.nomos.energy/api-references/errors/BAD_REQUEST
        errors:
          type: array
          items:
            type: object
            properties:
              code:
                type: string
                description: >-
                  What is wrong with the field, such as `invalid_type` or
                  `asset_not_found`. `x-extensible-enum` lists the values known
                  today. New values can be added in any API version, so treat an
                  unknown value like any other error of the response's status.
                example: invalid_type
                x-extensible-enum:
                  - invalid_type
                  - too_big
                  - too_small
                  - invalid_format
                  - not_multiple_of
                  - unrecognized_keys
                  - invalid_union
                  - invalid_key
                  - invalid_element
                  - invalid_value
                  - custom
                  - unserviceable_zip
                  - ended_subscription
                  - duplicate_grid_reduction
                  - missing_smart_meter
                  - missing_module_1
                  - incompatible_grid_reduction
                  - unsupported_product
                  - unsupported_meter_order
                  - duplicate_meter_order
                  - unsupported_meter
                  - out_of_period_meter_reading
                  - unsupported_meter_reading
                  - duplicate_meter_reading
                  - implausible_meter_reading
                  - duplicate_customer_email
                  - invalid_iban
                  - upgrade_api_version
                  - withdrawal_not_allowed
                  - invalid_termination_date
                  - subscription_not_started
                  - terminated_subscription
                  - missing_household
                  - invalid_household_customer
                  - invalid_household_meter
                  - duplicate_consumption_subscription
                  - invalid_inverter
                  - read_only_asset
                  - duplicate_external_id
                  - asset_has_children
                  - asset_decommissioned
                  - asset_not_found
                  - mixed_households
                  - field_not_allowed
                  - invalid_direction
                  - duplicate_timestamp
                  - asset_not_steerable
                  - mode_not_allowed
                  - slot_missing
              field:
                type: string
                example: customer.email
              message:
                type: string
                example: 'Invalid input: expected string, received undefined'
            required:
              - code
              - field
              - message
          description: >-
            Per-field breakdown of a validation or business-rule failure.
            Omitted for API versions before the structured-errors cutoff.
      required:
        - code
        - message
        - requestId
        - docs
    ErrUnauthorized:
      type: object
      properties:
        code:
          type: string
          enum:
            - UNAUTHORIZED
          description: The error code related to the status code.
          example: UNAUTHORIZED
        message:
          type: string
          description: A human readable message describing the issue.
        requestId:
          type: string
          description: The request id to be used for debugging and error reporting.
          example: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs:
          type: string
          description: The docs related to the error code.
          example: https://docs.nomos.energy/api-references/errors/UNAUTHORIZED
      required:
        - code
        - message
        - requestId
        - docs
    ErrForbidden:
      type: object
      properties:
        code:
          type: string
          enum:
            - FORBIDDEN
          description: The error code related to the status code.
          example: FORBIDDEN
        message:
          type: string
          description: A human readable message describing the issue.
        requestId:
          type: string
          description: The request id to be used for debugging and error reporting.
          example: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs:
          type: string
          description: The docs related to the error code.
          example: https://docs.nomos.energy/api-references/errors/FORBIDDEN
      required:
        - code
        - message
        - requestId
        - docs
    ErrNotFound:
      type: object
      properties:
        code:
          type: string
          enum:
            - NOT_FOUND
          description: The error code related to the status code.
          example: NOT_FOUND
        message:
          type: string
          description: A human readable message describing the issue.
        requestId:
          type: string
          description: The request id to be used for debugging and error reporting.
          example: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs:
          type: string
          description: The docs related to the error code.
          example: https://docs.nomos.energy/api-references/errors/NOT_FOUND
        errors:
          type: array
          items:
            type: object
            properties:
              code:
                type: string
                description: >-
                  What is wrong with the field, such as `invalid_type` or
                  `asset_not_found`. `x-extensible-enum` lists the values known
                  today. New values can be added in any API version, so treat an
                  unknown value like any other error of the response's status.
                example: invalid_type
                x-extensible-enum:
                  - invalid_type
                  - too_big
                  - too_small
                  - invalid_format
                  - not_multiple_of
                  - unrecognized_keys
                  - invalid_union
                  - invalid_key
                  - invalid_element
                  - invalid_value
                  - custom
                  - unserviceable_zip
                  - ended_subscription
                  - duplicate_grid_reduction
                  - missing_smart_meter
                  - missing_module_1
                  - incompatible_grid_reduction
                  - unsupported_product
                  - unsupported_meter_order
                  - duplicate_meter_order
                  - unsupported_meter
                  - out_of_period_meter_reading
                  - unsupported_meter_reading
                  - duplicate_meter_reading
                  - implausible_meter_reading
                  - duplicate_customer_email
                  - invalid_iban
                  - upgrade_api_version
                  - withdrawal_not_allowed
                  - invalid_termination_date
                  - subscription_not_started
                  - terminated_subscription
                  - missing_household
                  - invalid_household_customer
                  - invalid_household_meter
                  - duplicate_consumption_subscription
                  - invalid_inverter
                  - read_only_asset
                  - duplicate_external_id
                  - asset_has_children
                  - asset_decommissioned
                  - asset_not_found
                  - mixed_households
                  - field_not_allowed
                  - invalid_direction
                  - duplicate_timestamp
                  - asset_not_steerable
                  - mode_not_allowed
                  - slot_missing
              field:
                type: string
                example: customer.email
              message:
                type: string
                example: 'Invalid input: expected string, received undefined'
            required:
              - code
              - field
              - message
          description: >-
            Per-field breakdown of a validation or business-rule failure.
            Omitted for API versions before the structured-errors cutoff.
      required:
        - code
        - message
        - requestId
        - docs
    ErrInternalServerError:
      type: object
      properties:
        code:
          type: string
          enum:
            - INTERNAL_SERVER_ERROR
          description: The error code related to the status code.
          example: INTERNAL_SERVER_ERROR
        message:
          type: string
          description: A human readable message describing the issue.
        requestId:
          type: string
          description: The request id to be used for debugging and error reporting.
          example: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs:
          type: string
          description: The docs related to the error code.
          example: >-
            https://docs.nomos.energy/api-references/errors/INTERNAL_SERVER_ERROR
      required:
        - code
        - message
        - requestId
        - docs
  examples:
    400-missing-subscription:
      summary: Missing subscription
      value:
        code: BAD_REQUEST
        message: 'Invalid input: expected string, received undefined'
        requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs: https://docs.nomos.energy/api-references/errors/BAD_REQUEST
        errors:
          - code: invalid_type
            field: subscription
            message: 'Invalid input: expected string, received undefined'
    400-body-is-not-valid-json:
      summary: Body is not valid JSON
      value:
        code: BAD_REQUEST
        message: Malformed JSON in request body
        requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs: https://docs.nomos.energy/api-references/errors/BAD_REQUEST
    400-unsupported-version-header:
      summary: Unsupported version header
      value:
        code: BAD_REQUEST
        message: Version header 2026-01-01.foo is invalid.
        requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs: https://docs.nomos.energy/api-references/errors/BAD_REQUEST
    401-no-token:
      summary: No token
      value:
        code: UNAUTHORIZED
        message: No authorization header provided.
        requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs: https://docs.nomos.energy/api-references/errors/UNAUTHORIZED
    401-expired-token:
      summary: Expired token
      value:
        code: UNAUTHORIZED
        message: Token expired
        requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs: https://docs.nomos.energy/api-references/errors/UNAUTHORIZED
    401-invalid-token:
      summary: Invalid token
      value:
        code: UNAUTHORIZED
        message: Invalid or malformed token
        requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs: https://docs.nomos.energy/api-references/errors/UNAUTHORIZED
    403-role-without-access:
      summary: Role without access
      value:
        code: FORBIDDEN
        message: Forbidden to access this route.
        requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs: https://docs.nomos.energy/api-references/errors/FORBIDDEN
    403-token-without-scope-2:
      summary: Token without scope
      value:
        code: FORBIDDEN
        message: 'Insufficient scope: write:* required.'
        requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs: https://docs.nomos.energy/api-references/errors/FORBIDDEN
    403-customer-token-without-customer:
      summary: Customer token without customer
      value:
        code: FORBIDDEN
        message: Customer not found.
        requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs: https://docs.nomos.energy/api-references/errors/FORBIDDEN
    404-unknown-subscription:
      summary: Unknown subscription
      value:
        code: NOT_FOUND
        message: Subscription not found
        requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs: https://docs.nomos.energy/api-references/errors/NOT_FOUND
    500-unexpected-error:
      summary: Unexpected error
      value:
        code: INTERNAL_SERVER_ERROR
        message: Internal Server Error
        requestId: 37a04f8f-e791-491c-81e1-86cd304649bb
        docs: https://docs.nomos.energy/api-references/errors/INTERNAL_SERVER_ERROR
  securitySchemes:
    Bearer:
      type: http
      scheme: bearer
      bearerFormat: JWT

````

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