The MyLuminus app provides Luminus customers with a fully-fledged energy assistant, allowing them to manage their daily energy consumption from A to Z. Various dashboards give them an immediate overview of their usage for all their electricity and gas meters. Some readings come from Luminus, while others are entered manually. In the future, it will be possible to add smart meters too. Customers can also adjust their prepayments based on their energy consumption, which allows them to optimise their annual adjustment bill at any time and avoid unpleasant surprises when the bill comes.

Last but not least, customers can view their past bills and discover Luminus news and energy tips.

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The challenge


In recent years, electricity has become increasingly expensive. Therefore energy suppliers are doing their utmost to give consumers a clear overview of their consumption and the associated costs. Tips for saving energy, advice, direct communication and simple budget management are important features for Luminus.

This service was already available in a desktop version, but assistants are more convenient to use, more personal and more accessible on smartphones. This resulted in a clear need for a MyLuminus app.

The Reference was asked to create this application for smartphones and iPads. Since the application relies on intense interaction with back-end environments, it was largely developed on site at the Luminus offices.

The project was executed using an Agile/Scrum methodology, which allowed for fast and flexible development. A Product Back Log was created and the sprints were filled with the highest priority features. After each sprint, the application could either be rolled out further or a new sprint could be developed.

The product owner was a Luminus representative, who ensured we could meet the stakeholders’ precise expectations.

For each sprint, the new features were fully wireframed and then made interactive (prototypes), giving Luminus a clear view of the app’s flow and how it worked.

After this process, a graphic design was devised and further refined.

Once the concept was approved, the actual development phase was launched.

Following the development phase, The Reference and Luminus tested the app and a technical/security audit was held since the app uses personal information and budget data.

The application is monitored by Google Analytics/app store reviews and ratings at all times. Moreover, the stakeholders are regularly asked which new features should be added and whether the app needs to be amended and how.

An iOS smartphone and Android version were created first, followed by an iPad tablet version. We also used the Scrum/Agile methodology for this.

Functional breakdown

  • Following the installation of the application, a brief onboarding shows the most interesting app features to convince the app users to log in.
  • They can log in using their Luminus e-mail account, Google or Facebook.
  • The user is then shown clear, well-organised dashboards of their electricity and gas meters.
  • We opted for a card-based interface, which allows for flexible sorting, with cards displayed based on the available information and profile.
  • Customers can enter their meter readings manually.
  • The graphs are interactive (zoom, filters etc.), allowing for a lot of data to be displayed, in line with the user’s wishes.
  • The graphs show both manually entered measurements and values submitted by Luminus and forecasts.
  • Besides the graphs, the app also includes a table with raw measurement data.
  • Customers can adjust the amount of their prepayments and adjustment bills based on the meter readings entered for each supply address.
  • Customers can view all the paid and unpaid bills, including all their details, individually or as an overview.
  • Users can easily edit their CRM data themselves.
  • LumiWorld and ‘Did you know?’ include tips on how to make better use of energy and the Luminus services.
  • In the ‘Extras!’ menu, users can find a lot of additional benefits that are relevant to Luminus customers, such as the installation of a central heating boiler.
  • Push notifications and an inbox feature in the application allow for certain customer segments to receive custom messages.
  • The integrated Facebook feed in the app displays the latest Luminus news.
  • Since the iOS application is universal, there is a separate layout for the iPad version, which includes the same components, but with a focus on the specific tablet interface. This allows for the larger screen to be used optimally and offers the possibility of displaying even more data.
  • Asynchronous communication means that there are no waiting times when using the application.
  • A swipe menu shows all the useful navigation elements, guaranteeing smooth navigation.
  • In several locations, the application has micro animations and coach marks to subtly pinpoint certain features and options to the end users, to familiarise them with the app more quickly.
  • The application features extensive analytics through integration with the Google Tag Manager.

Technical breakdown

  • Native implementation for Android (JAVA)
  • Native implementation for iOS in Swift (with xCode)
  • GIT source control, TeamCity build server
  • Virtually all artwork, images and animations are vectoral, using PaintCode and Sketch (sharp images guaranteed regardless of the screen resolution)
  • Full asynchronous communication with the Luminus back-end for meta-data searching
  • Google analytics for mobile integration
  • Urban airship push notifications + inbox
  • Interactive graphics developed in-house
  • Secure communication via HTTPS, JSON/REST and OAuth2
  • Use of the iOS/keychain for secure data storage on iOS
  • Use of custom encryption for secure data storage on Android
  • Facebook and Twitter integration


Luminus is a manufacturer and supplier for gas and electricity on the Belgian market. The company belongs to the French group EDF since 2011. The company is the second largest energy supplier of Belgium and a major producer of electricity.

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