Privacy Policy

Voltly (Min Elpris) for iPhone and Android · effective 28 September 2026

Two ways to connect the meter

There are two paths, and they treat your data differently:

• With MitID (the current one). You sign an authorisation at Energinet, and EU Studio's server fetches your metering data on your behalf. Something is stored on the server — see the section below.
• With a data access token (the old one). If you set the meter up that way, it keeps working unchanged until the token expires. That path touches no server: the token lives in the phone's keychain and follows your iCloud Keychain so your other devices can use it, and metering data is fetched straight from Energinet to the phone.

What the app stores on the phone

• Your settings (price area, grid company, supplier and markup, appliances, alerts, theme) live on the phone and in your own iCloud account, so a new phone picks up where you left off. The backup is on until you turn it off in Settings.
• Electricity prices and tariffs are fetched from Energinet's open API and cached on the phone so the app works offline. They are not about you.
• Your metering data (consumption and any solar export) is stored on the phone, so the charts work offline. The file can only be read while the phone is unlocked.
• The address of your meter comes from the server, so the app can show which home the numbers belong to. It stays on the phone and is not part of the iCloud backup — nor are your meters.
• The key to the connection lives in the phone's keychain and is not synced to iCloud. It is the whole of the access to your metering data, and a copy in a backup is a copy that can be stolen.

On Android

The Android app does the same as the iPhone app, with the phone's own tools instead of Apple's:

• Your settings are included in the phone's backup with Google instead of iCloud. Only the settings — not the address, the meters, the metering data or the key to the connection. The «Backup with Google» switch in Settings turns it off.
• The key to the connection is encrypted with a key in Android Keystore, which cannot be taken off the phone, and is kept in a place that is never included in a backup.
• Your metering data and the address live in the app's own private storage on the phone, which Android encrypts.
• The old path with a data access token does not exist on Android. There you connect with MitID only.
• When you sign in with MitID, the app opens Eloverblik in the phone's browser. The app does not see what you type there.

What the server stores when you connect with MitID

You sign in at Energinet, not with us. The app never sees your MitID. The authorisation grants EU Studio read access to your own metering data — nothing else.

On EU Studio's server (api.eustudio.org) we store:

• The connection itself — its state, when it was created and when the authorisation expires. The key is kept only as an irreversible fingerprint, never as it is.
• Your metering points — the metering point id (GSRN), the authorisation number and the address. They are held encrypted. The app never sees the metering point id or the authorisation number — it only knows an opaque handle. It does receive the address, so it can show it.
• Your metering data is cached encrypted for up to 8 days, so the same day is not fetched from Energinet over and over. The phone keeps its own copy, which is not bound by those 8 days.
• A record of when data was fetched for a metering point. It exists so you can be told what happened to your authorisation, and is kept for up to 12 months.

Nothing about who you are is stored. No account, no name, no email, no national or company registration number. The server knows a connection and some metering points — not a person.

The server runs in Frankfurt and the database sits in eu-central-1. Your data does not leave the EU.

Solar forecasts on iPhone

You can set where your solar panels are in two ways: if you type a city, the search is sent to Apple Maps. If you tap “Use my location”, the app asks once for your phone’s location while it is open — only if you allow it — and rounds it to about 1 km. The selected city and rounded coordinates are saved in your energy profile and included in your iCloud settings backup when enabled. With Premium, these coordinates are used to fetch Apple Weather forecasts, under Apple’s own privacy policy; nothing is sent to EU Studio. The app does not track your location in the background. Weather data is used to estimate solar production and plan home battery use.

Who the app talks to

• Energi Data Service (energidataservice.dk) — electricity prices and grid companies' tariffs. These calls contain nothing about you; they ask for a price area and a time range.
• Energy-Charts (energy-charts.info, Fraunhofer ISE) — electricity prices in France, the Netherlands and Belgium. The calls ask for a price area and a time range, nothing about you.
• The European Central Bank (ecb.europa.eu) — the daily exchange rate when euro prices are shown in Norwegian or Swedish kroner.
• Our own website (minelpris.vercel.app) — a public file listing grid operators, suppliers and taxes per country, so a rate can be corrected without a new version of the app. The request is the same for everyone and contains nothing about you.
• EU Studio API (api.eustudio.org) — only if you have connected your meter with MitID. It is run by EU Studio ApS, a registered third party with Energinet.
• Eloverblik (eloverblik.dk) — straight from the phone, if you are on the old path with a data access token.

There are no third parties, no ad networks and no measurement tools in the app.

Purchases

Premium is a subscription or a one-time purchase. Apple handles the purchase through the App Store on iPhone, and Google through Google Play on Android; the app never sees your name, your email or your payment details. It is only told whether a valid purchase exists.

Notifications

Price alerts are scheduled locally on the phone from prices it has already fetched. No push server is involved, and nobody knows what your thresholds are set to.

How to delete all of it

In the app under Settings → Elmåler → Disconnect. That deletes the connection and your metering points on the server, clears the cache, and removes the metering data from the phone. An ended connection remains for up to 30 days with no personal data — only so the app can be told that it ended.

🚨 The authorisation itself is between you and Energinet. You have to revoke it at eloverblik.dk; the app cannot do it for you. If you do it there, the server notices by itself and deletes your metering points.

Delete the app without disconnecting first and the connection stays until the authorisation expires. Better to disconnect first.

Your rights

If you connect with MitID, EU Studio ApS processes personal data about you, and you have the rights the GDPR gives: access, rectification, erasure, restriction and objection. Write to edp@eu-networks.dk.

The basis is your consent — the authorisation you sign at Energinet yourself — and you can withdraw it at any time, without giving a reason.

On the old path with a data access token, no copy of your data exists outside your phone and your own iCloud account, so there is nothing to request from us.

Children

The app is not directed at children and collects no information about anyone, at any age.

Changes

If this policy changes, the new date appears at the top of the page.

Contact

Questions about privacy in Voltly: edp@eu-networks.dk