• €31,258/year from arbitrage
  • €29,884/yearfrom flexibility
  • +17% PV production
  • 200 kW grid cap managed
An Estonian PV site turned market volatility into profit with Fusebox’s EMS, earning over €60,000 annually and increasing solar output by 17%.

Client: An Estonian renewable energy investor managing several PV sites and focused on maximizing the efficiency and returns of their clean energy portfolio.

Objective: The client aimed to enhance the performance of one of their key PV parks by integrating a battery energy storage system with a smart EMS. Their goal was to increase asset efficiency, reduce exposure to negative and volatile energy prices, and unlock new revenue streams through participation in the TSO flexibility market via Fusebox’s Virtual Power Plant.

Overview

When a seasoned renewable energy investor wanted to turn a conventional PV park into a lean, mean energy-generating machine, they turned to Fusebox’s cutting‐edge EMS solution. By integrating an advanced battery system with real-time operational intelligence, our client not only boosted energy storage but also maximized returns from an increasingly unpredictable energy market. Think of it as having a battery that’s smarter than your average smartphone—and it doesn’t need a daily software update!

The Challenge

Before Fusebox stepped in, the site was underperforming due to market volatility and infrastructure constraints. Several key issues were holding the PV park back:

  • Grid limits: The 528 kW PV system regularly exceeded the 200 kW grid cap, risking DSO penalties.

  • Operational rigidity: Existing systems couldn’t adapt to fluctuating production and price signals.

  • Market volatility: Energy prices ranged from –30 €/MWh to 500 €/MWh, leading to lost revenue during negative or low-price periods.

The Solution

To solve these challenges, Fusebox deployed its advanced EMS and integrated it directly with the client’s energy assets. The setup brought intelligent control, real-time insight, and market-driven optimization into one unified system.

  • Battery system: A Cube Energy PowerCombo 500 kW / 1104 kWh paired with Sinexcel and Huawei inverters.

  • EMS integration: Fusebox controller connected all assets via Mod-Bus TCP/IP, enabling centralized, real-time control.

  • Grid compliance: The system respected 200 kW in/out grid limits automatically, preventing penalties and smoothing operations.

Key Capabilities

Fusebox’s EMS wasn’t just smart—it was built to make every kilowatt count. The system delivered real results through a focused set of capabilities:

  • Grid limit control: Real-time monitoring kept battery operations within safe bounds, avoiding DSO penalties.

  • Price-based automation: Charging and discharging followed day-ahead prices, forecasts, and tariffs—maximizing value without manual input.

  • Energy arbitrage: The EMS stored low-cost energy and sold it during peaks, optimizing returns daily.

  • Custom rules & alerts: Operators could define limits for SoC, temperature, and timing—backed by real-time alerts for fast response.

The Results

Fusebox’s EMS transformed the site’s performance. Financially, operationally, and technically.

  • +€31,258/year in energy arbitrage: Smart trading between low and peak prices delivered daily revenue gains.

  • +17% in PV production: Less curtailment meant more clean energy captured and used.

  • Lower financial losses: Battery optimization cut export losses during negative price periods.

  • Better operational control: Automated decisions and real-time monitoring kept the site compliant, efficient, and penalty-free.

Conclusion

When energy markets become unpredictable and grid constraints start piling on pressure, having the right tools makes all the difference. Fusebox’s EMS provided more than just control. It gave the client the ability to turn volatility into value. By managing price swings and unlocking new revenue streams, they transformed a standard PV site into a future-ready energy asset. That’s not just clever technology. That’s European energy done right.