enerthing addresses the challenge of powering billions of IoT devices sustainably and at scale. Primary batteries and wired power create high costs, much of it from the operational process of replacing batteries. To overcome this, enerthing has developed a holistic solution combining highly efficient photovoltaic technology, tailored sensor hardware and firmware, and robust cloud operation. At its core is a proprietary, mass-produced next-generation indoor photovoltaic technology optimized for low-light environments. This enables reliable, maintenance-free, self-powered IoT devices that eliminate the need for batteries or cables, ensuring sustainable, high-performance deployments. With its retrofit approach, enerthing has digitized over 100 office buildings with 6,000 light-powered sensors and more than 80 logistics buildings. By delivering actionable data to cut CO₂ emissions, improve efficiency, and enhance comfort, enerthing paves the way for smarter, greener building management.