Introducing: the first 7 startups joining Rockstart Energy Spring 2023

Several times per year, Rockstart has the privilege of receiving applications from hundreds of innovators, game-changers, and pioneers behind some of the most exciting moves being made in sustainable tech. Focusing on early stage investments in Energy, Emerging Tech, and AgriFood, we support founders via industry-specific and tailored accelerator programs. 

We’re thrilled to introduce you to 7 startups joining the Rockstart Energy portfolio for the Spring 2023 program, increasing our Energy portfolio to 33 companies. The program launched in February, welcoming early-stage startups focused on driving the energy transition. Learn more about them:


Circadian accelerates the energy transition of businesses in frontier markets by empowering solar installers and energy service companies to win commercial and industrial projects, reduce costs, and maximize customer lifetime value. Their proprietary IoT hardware and SaaS platform help customers to better design, sell, finance, manage, and optimize renewable energy systems, transforming their entire value chain. 

“From the minute you arrive in Amsterdam, you realize that the entire Rockstart team is laser-focused on adding real value to your business  […] Not only are the mentors we get to work with of the highest caliber, but so are our peers in the cohort. Aligned but not competing, you immediately start to freely exchange knowledge and uncover synergies with these great teams who are fast becoming friends.”

Max Boit, Co-founder & CPO, Circadian


Enyday is a Danish climate tech company working with “behind-the-meter” energy communities and collective self-consumption in the real estate industry. The platform offers an intelligent billing solution for shared electricity and provides the necessary integrations to easily operate and maximize the on-site solar production in large multi-tenant residential buildings.

“From the very beginning when we got to know Rockstart and their energy team, we got a great impression. We could see the same high ambitions and met great professional people on the Rockstart team. We are at the stage of our journey with operations and we were therefore keen to partner up with an international VC to help scaling. With Rockstart as a VC and accelerator, we believe we found a great active partner which can help us to the next stages.”

Christopher Tolstrup, Founder & CEO, Enyday

Fast Trek

Fast Trek is a network-based route optimization tool for long-haul road logistics. Through their innovative technology, they enable significant and critical reductions in carbon emissions and costs for any company moving cargo.

“The reputation of Rockstart as a connector to relevant and influential people specific to startup needs solidified our decision to participate. Once on location, the team and the drive behind them proved to us that we made the right decision.”

Jósep Thorhallsson, Founder & CEO, Fast Trek


Globally, a lot of energy is wasted by inefficiencies in heat exchangers. Hexwise is developing digital twins for heat exchangers. By gathering the right data and performing the right analysis, they enable optimized maintenance and operations. With their solution, many industrial processes can increase their energy efficiency including thermal power plants, gas transport networks, chemical facilities, and many more. 

We believe joining Rockstart will be a game-changer in our journey. They provide a highly valuable ecosystem of mentors, investors, experts, and other founders. They have more than a decade of valuable experience in startup support in the energy sector and with their structured approach and professional team, they help us lay the right foundation for Hexwise. 

Niels Bergsma, CEO and Co-Founder, Hexwise 


Homes consume 22% of the world’s total energy. To reach net-zero targets, we need solutions that show where we waste energy, how we can take action, and how we progress over time. MOOST develops technology that enables smart building companies and utilities to offer personal energy assistants to households worldwide, offering relevant and actionable recommendations for saving energy.

“With more and more customer projects, people joining our team, and increasing operations, we have started to shortcut strategic discussions. Rockstart and their amazing team have already helped us tremendously to uncover blind spots and address them in a very structured way.”

Lucas Senn, Co-Founder & CTO, Moost

PF Nexus

PF Nexus is a marketplace and global ecosystem for renewable energy projects. Users gain access to $4 billion live deal flow, representing 10GW clean energy generation capacity. The platform also provides information on 2,500 developers, investors, and lenders.

“What Rockstart has developed is fantastic. I struggle to think of another investor/VC who has brought together a high-caliber leadership team, mentor network, investors, and top-tier partners spanning the European energy industry so deeply and broadly. Speaking to the team and looking at Rockstart’s track record, it was clear that they had developed deep insights into the key growth levers for businesses in ClimateTech, renewable energy generation, B2B SaaS and marketplaces, making them an ideal partner for PF Nexus.”

Scott Gillam, CEO, PF Nexus


Twindo provides a field service management system loaded with AI capabilities, enabling companies to efficiently build, service, and maintain wind turbines. By focusing on the final frontier of wind energy, Twindo combines human data input with challenging variables like weather forecasts to help stakeholders plan and deliver complex projects.

“Rockstart was a must-have partner in our minds because of its mission: empowering founders to drive positive change on a global scale. At Twindo, we’re aiming to add a lot more efficiency and savings to renewable energy stakeholders, hence contributing to a fast-paced energy transition. In addition to that comes all the professional support, guidance, and years of expertise in several segments and markets from the Rockstart team and mentors.”

Jules Shertser, Co-founder & CEO, Twindo

Explore the Rockstart Energy fund and portfolio.