Norwegian electric power prices

Node.js script that fetches the current day-ahead price from the ENTSO-E transparency platform API and calculates the price in NOK based on exchange rates from Norges Bank's API.

The market balance area name (NO1-NO5) for which to fetch the price must be given as argument.

The price is published to a MQTT topic with QoS=1. The data can easily be consumed by Home Assistant and probably other smart house hubs as well.

Installation

Assuming you have Node.js already installed on you machine, simply clone this project and run

npm install

Configuration

The script is dependent on the following environment variables being present:

Variable	Description
ENTSOE_TOKEN	Your ENTSO-E API token. Register to apply for a token here
MQTT_URL	The url for you MQTT server, e.g. 'mqtt://127.0.0.1'
MQTT_USERNAME	The MQTT server user name
MQTT_PASSWORD	The MQTT server password
MQTT_TOPIC	The MQTT parent topic to publish data to. If for example set to 'prices/day-ahead/current' the price will be published to a sub-topic for the given area, .e.g. 'prices/day-ahead/current/NO2'

Command line arguments

The script should be executed with the market balance area name as argument, e.g.:

node index.js NO2

How to run

The easiest way is to create a shell script, assuming you are running on a Linux distro like Rasbian or Hassbian:

#!/bin/bash

export ENTSOE_TOKEN='<token>'
export MQTT_URL='<url>'
export MQTT_USERNAME='<username>'
export MQTT_PASSWORD='<password>'
export MQTT_TOPIC='prices/day-ahead/current'

node index.js $1

Then use crontab -e to configure this script to be executed at every whole hour:

0 * * * * (cd /full/path/;./fetch-day-ahead-price.sh NO2) 2>&1

Integration with Home Assistant

Configure an MQTT sensor in Home Assistant to import the price data:

sensor:
  - platform: mqtt
    name: 'Strømpris'
    qos: 1
    state_topic: prices/day-ahead/current/NO1
    json_attributes_topic: prices/day-ahead/current/NO1
    value_template: '{{ value_json.price_including_vat }}'

Then you can easily show a graph in the lovelace UI: