As we shift from fossil fuels to renewable sources like solar, wind, and hydropower, batteries become essential. They help integrate these intermittent sources into the grid, so there’s always energy available.

But integrating batteries with renewable production, local consumption, and the energy market isn’t simple. Fortunately, providers like Fusebox have a solution to this complex operation. To help explain it, here are four key terms central to batteries and the energy grid.

1. Battery Energy Storage System (BESS): Batteries or groups of batteries that store electrical energy, capturing it when produced and releasing it when needed.
2. Battery Management System (BMS): The electronic system that monitors and manages the battery system’s internal workings, such as its temperature and state of charge (SoC).
3. Smart batteries: Batteries that not only have a BMS but also link up to virtual power plant (VPP) software via the cloud. Smart batteries are managed centrally and connect to the energy markets to help balance things out and stabilise the grid.
4. Transmission system operators (TSOs): The companies responsible for transporting electrical power on a national or regional level and keeping the grid balanced.

Wind and solar together reached roughly 17% of global electricity generation in 2025 (IEA Global Energy Review 2026), and their combined share keeps climbing quickly as more capacity comes online. Their intermittency is exactly why Smart Batteries sit at the core of this transformation. Curious about how they’re shaping the future of clean power? Here are six key insights, including how Fusebox is helping companies on their journey to clean energy.

1. Smart batteries increase the reliability of renewable energy production

We all know the weather can be unpredictable, and that’s the tricky part with renewable energy: it’s not always consistent. Smart batteries store extra energy when there’s a surplus and release it when needed, ensuring a consistent and dependable power supply even during the most intermittent conditions.

This makes renewable energy more reliable, and helps push its share of the grid higher over time.

2. The BMS safeguards the battery

Modern energy storage systems have a built-in control unit known as the Battery Management System, or BMS, which safeguards the battery. It’s responsible for regulating voltage, current, and temperature as the battery charges and discharges.

But while the BMS looks after the battery’s health, it doesn’t connect it to energy markets or local consumption, and it doesn’t allow for easy monitoring based on things like demand or frequency changes.

That’s where smart VPP software comes in. This software dynamically adjusts the battery’s output in response to real-time fluctuations in energy supply and demand — an optimisation often referred to as “flexible energy.”

Fusebox’s virtual power plant (VPP) is a champion of flexible energy. We provide these services to companies operating battery systems, giving them a more resilient and sustainable energy infrastructure, as well as a new revenue stream.

3. Smart batteries help stabilise the energy grid

Smart batteries play a big part in keeping the energy grid stable. The VPP software behind them optimises charging and discharging, storing energy efficiently during periods of low demand and releasing it during grid fluctuations. This balancing capability helps prevent overloads and makes the grid more stable overall.

TSOs are responsible for maintaining a stable electricity grid, and independent software providers like Fusebox work closely with them and asset owners to help achieve that.

4. Smart batteries create more revenue than just selling energy

If you’re investing in batteries, the smart move is to play the energy market and do energy arbitrage: charge up when prices are low, then sell that stored energy when prices are high. It’s all about maximising your return.

The lesser-known opportunity is the balancing market, also called the ancillary market, created to incentivise market participants and help keep the energy grid secure. It’s separate from the regular energy market (which focuses more on longer-term transactions) and instead balances the market in real time, managing imbalances between supply and demand.

For BESS owners, this balancing market is a source of revenue: you can offer these ancillary services to grid operators, where prices are usually higher than what you’d receive from the traditional energy market. Ancillary-market revenue for battery parks in markets like Finland has historically been substantial, though as more batteries enter these markets across Europe, that revenue has been thinning quickly — worth checking current figures for your specific market before modelling returns. This dynamic also encourages storage manufacturers to meet the technical requirements these services demand.

Enter Fusebox’s virtual power plant software. The VPP acts as a bridge to the balancing market, helping asset owners earn additional income. Our cloud-based platform manages multiple energy resources — batteries, renewables, and local power use — adjusting their behaviour using information from both the balancing and regular energy markets, while keeping track of each asset’s technical capabilities and grid connection point.

5. Smart batteries help owners comply with complex grid regulations

If battery owners don’t follow grid and connection point rules, they can run into problems. For instance, if a BESS charges or discharges unexpectedly, it can disrupt the grid’s balance, causing voltage and frequency issues. Grid operators may fine these disruptions, and if a BESS fails to deliver promised services like frequency regulation or voltage support, the owner could face penalties too.

With Fusebox, customers can meet these grid requirements easily through our smart, automated solution.

6. Smart software supports battery health

Fusebox doesn’t just offer BESS owners financial benefits — it also helps maintain the battery’s health and meet grid connection rules. Users can set various restrictions through the platform, including shutting down operations based on overtemperature, setting time constraints, establishing daily cycle limits, specifying usable SoC ranges, and more.

The grid connection point may have rules on how much power it can send or receive, often set by the distribution system operator (DSO) or TSO, based on the voltage level at which the battery connects to the grid. To follow these rules, the BESS needs integrated grid connection point measurements — which isn’t always easy given technical limitations or other energy assets connected nearby.

With Fusebox, our VPP platform syncs with the grid connection, making it easier to manage and follow the rules.

In summary

Smart batteries are undoubtedly part of the future of sustainable energy, but to truly harness their potential, they need to be integrated with a virtual power plant (VPP).

Fusebox has a competitive edge in many of its technical capabilities, but more importantly, it’s the seamless integration and automated control that make it an easy system to manage. Our VPP platform helps battery owners navigate complexity, optimise performance, and build a more resilient and sustainable energy setup.

Want to know more about how Fusebox can help your business? Contact us!