As the share of renewable energy continues to grow, the need for large-scale energy storage solutions becomes increasingly critical. Ensuring energy security and maximizing profitability requires careful, data-driven planning of investments in energy production, storage, and consumption. Long-term decisions demand robust calculations – presented in a way that enables all stakeholders to make swift and informed choices.
Providing clients with clear insights into system profitability
Energiapartner, a seasoned designer and installer of solar parks and battery storage systems, aimed to be a strategic ally for clients navigating the energy transition. To enhance their sales process, Energiapartner partnered with STACC to develop a tool that enables clients to quickly and clearly understand the profitability of proposed energy solutions – factoring in equipment, financing, and market participation.
“Investing in storage solutions is a significant business decision. We wanted to provide our clients with prompt and comprehensible information about the profitability of development projects. Together with STACC, we developed a tool for our sales team that accounts for the specific characteristics of a client’s project – both in terms of equipment and financing details – and helps determine the optimal solution for the client.”
— Mikk Saar, Member of the Management Board at Energiapartner
A powerful tool for the sales team
The tool developed for Energiapartner builds upon STACC’s existing energy system profitability calculator. It calculates the investment payback period based on the client’s energy consumption and the parameters of various energy system components (such as solar parks, EV chargers, and batteries). The logic was further customized to include elements critical for Energiapartner – such as loan-based financing, participation in multiple electricity markets, and the separation of fixed and variable costs.
The tool enables the sales team to:
- use up to 60 input parameters, from system-specific metrics to aggregator fees, including the ability to import hourly resolution data for energy consumption and solar production;
- quickly adjust inputs, such as financing terms or market strategies (e.g., day-ahead vs. frequency markets);
- save and reuse configurations, allowing the team to easily generate alternative proposals for the same client.
For client-facing outputs, the tool generates:
- a summary of calculation results with intuitive visualizations that clarify the investment’s value;
- detailed tables and formatted reports that can be downloaded and shared with business partners or financial institutions.
The end result is a user-friendly tool that transforms complex calculations into clear business value – for both the sales team and the client.
Collaborative development and STACC’s role
The solution was delivered as a full-service project: the client defined their needs and requirements, while STACC handled the methodology, technical development, hosting, and ongoing support. Development followed an iterative process, allowing the team to continuously test and fine-tune new features based on feedback.
“Several new capabilities had to be added to the existing profitability calculator based on Energiapartner’s requirements: participation in mFRR, aFRR, and FCR frequency reserve markets; detailed PDF report generation; loan- and grant-based financing models; and additional market and grid parameters. This gives the sales team, on one hand, the ability to simulate real-life scenarios with a high level of accuracy, and on the other, makes it easy to explore different what-if cases. Energiapartner’s domain knowledge also significantly enhanced STACC’s development team’s expertise in the energy sector,” commented STACC data engineer Karl Kevin Ruul.
Reduced manual work, increased client focus
The tool’s greatest impact for the sales team was not just time savings, but also the ability to respond quickly to client needs. Proposals that once required manual recalculations can now be regenerated in minutes – shifting daily work away from repetitive tasks and toward strategic collaboration.
“Sales work is intense and time-sensitive. Many proposals are in progress at once, each with multiple variations, and calculating them manually used to take hours. If a client requested changes, we had to start over. Now, we can use saved inputs to generate a fresh, updated report in no time – ready for discussions with partners and banks. I can now focus more on designing the best solution for the client, rather than spending time on repetitive calculations.”
— Karl Miilits, Sales Engineer at Energiapartner
Interested in a similar solution?
Every project is unique – and deserves a tailored tool. If you’re looking for a data-driven solution that fits your business needs, simplifies complex decisions, and helps communicate value clearly to your clients, get in touch. Let’s explore how STACC can support your journey.
