Wattwatchers and HomeKit: Experiments in Home Energy Automation

Integrating Energy Management and Home Automation: A Look at Wattwatchers' Prototype with Apple's HomeKit


In the quest for energy efficiency and sustainability, home energy automation has emerged as a transformative solution. Wattwatchers, a leading Australian energy monitoring and control solutions provider, has been at the forefront of this revolution. In this knowledge base article, we explore Wattwatchers' efforts to integrate energy management with Apple's HomeKit home automation platform, creating a seamless and automated approach to optimising energy usage.

  • The Challenges of Optimising Energy Use

While Wattwatchers' product suite offers valuable insights into energy consumption, many consumers find it challenging to actively optimise their energy use due to time constraints and other priorities. Recognising this issue, Wattwatchers envisions a future where energy management can be effortlessly automated without sacrificing user control.

  • The Potential of Home Automation

Home automation systems like Apple's HomeKit and Google Home have already made strides in automating various aspects of home life. From turning off lights when rooms are vacant to adjusting window blinds based on sunlight, these systems enhance energy efficiency. However, energy usage and generation integration are still limited within existing home automation platforms.

  • Leveraging Energy Integration for Optimisation

To achieve seamless energy optimisation, Wattwatchers explores key use cases, such as leveraging rooftop solar energy effectively and managing dynamic tariffs offered by energy retailers. Integrating energy management and home automation presents numerous opportunities for consumers to reduce costs and enhance their environmental impact.

  • Building the Prototype with HomeKit and Homebridge

Wattwatchers embarked on building a prototype to explore the integration of energy management scenarios with Apple's HomeKit using the Homebridge framework. Homebridge facilitates the integration of smart home devices that are not natively supported by HomeKit, offering a workaround for Wattwatchers' objectives.

  • Challenges and Creative Solutions

Integrating energy monitoring and control within HomeKit's framework presented unique challenges. HomeKit lacks native support for energy-related characteristics, leading to creative solutions such as modeling excess solar as an occupancy sensor. Additionally, asynchronous switches required innovative thinking, and complex automation rules called for additional workarounds.

  • Demonstrating the Finished Product

The completed Wattwatchers Homebridge plugin successfully integrates available switches with HomeKit, enabling users to control relevant circuits in their homes. For sites with solar, the plugin emulates excess solar as an occupancy sensor, which users can configure based on their energy needs.

  • Limitations and Future Outlook

While the prototype showcases the potential of integrating energy management and home automation, it also highlights the current limitations of Apple's HomeKit platform. The lack of native energy units and support for complex rules hinders seamless integration. Mainstream adoption will necessitate more comprehensive and user-friendly experiences.


Wattwatchers' endeavor to integrate energy management with home automation represents a significant step towards a more energy-efficient and sustainable future. By automating energy optimisation, consumers can effortlessly reduce their carbon footprint and make informed choices about their energy usage. While the prototype with HomeKit demonstrates the possibilities, the journey towards mainstream adoption requires addressing the current limitations and ensuring a seamless experience for all users. As Wattwatchers continues to innovate and collaborate with leading smart home platforms, the vision of automated and energy-conscious households draws nearer.

To learn more and watch the Youtube video of the experiment, Please click Here