Esysteme21, a German solar company, has made waves by creating a fully self-sufficient energy system using a combination of photovoltaics, hydrogen, and battery storage. This innovative solution is now being presented as a viable option for medium-sized enterprises in the industrial and commercial sectors. The company's managing director, Norbert Unterharnscheidt, highlighted that their energy costs for electricity and heat now average €0.25 ($0.27) per kWh. The energy system includes an 80 kW solar system, an 80 kWh battery storage system, and an electrolysis system for hydrogen production. The generated hydrogen can be converted back into electricity during periods of low solar energy, providing a sustainable energy source for various applications. Additionally, the site features a mix of renewable technologies such as heat pumps, hydrogen dark radiators, and electric vehicle charging stations powered by renewable electricity. With a focus on achieving climate neutrality, Esysteme21 invested a total of €600,000 in the energy solution itself, complemented by an extra €700,000 spent on building upgrades and environmental enhancements. Leveraging their success, the company now offers consultancy services to aid other businesses in transitioning towards sustainable energy practices. Despite acknowledging that such advanced energy solutions may currently cater to a small group of pioneers, Unterharnscheidt stressed the significance of demonstrating the feasibility and reasonable costs associated with these technologies. By showcasing the potential for energy self-sufficiency and emphasizing the economic advantages, Esysteme21 aims to pave the way for broader adoption of innovative sustainable energy practices in the market.