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The Openenergymonitor project was started because they needed open-source tools to better understand how they use energy, how their energy systems work, and the difficulty of producing sustainable energy. As they transition from fossil fuels to a zero-carbon energy source, their energy systems will undergo a revolution over the course of the next 20 years. They can determine what are the appropriate measures to adopt by employing tools for energy monitoring, modeling, and assessment. Then, they can make sure that the solutions perform as intended and continue to function effectively over time. See the Guide to learn more about the Openenergymonitor energy monitoring system. Their entire output is open source (hardware & software). They think that using open source is a better method since it allows them to build on and learn from one another's contributions, which helps them come up with better answers to the problems they encounter.