A widespread misunderstanding in the energy industry is: „A battery storage system always needs a generation plant.“ No PV, no storage—or at least not an economical one. This statement is outdated. A Standalone storage prove the contrary.
Rising price volatility in electricity markets, growing grid congestion, and the increasing need for system flexibility have made grid-connected battery storage—completely without a wind turbine or solar roof—extremely economical today. For investors, it serves as a yield-optimized FTM asset. For industrial companies, it also acts as an intelligent tool for reducing grid fees and energy procurement costs. This remains true even when a lack of space, rental agreements, or structural conditions preclude a PV system.
What is a standalone storage system?
A standalone storage system (also known as standalone BESS) is a battery energy storage system that is connected directly to the public power grid via its own dedicated grid connection point (GCP). It is possible to share the grid capacity at the GCP with a consumer/company. Structurally, however, it is not linked to a generation facility such as PV or wind.
This is the essential difference to Co-Location BESSThere, generation plant, storage system, and consumers share a common grid connection point—the storage system is conceptually always conceived in the context of generation. In the case of co-location, this applies to Green electricity storage as well as for Grey Water Storage Tank. In contrast, with standalone storage, the storage unit is an independent asset. It charges and discharges exclusively from the grid, allowing it to react with complete flexibility to both internal operating signals (peak loads, load periods) and external market signals (spot market prices, balancing energy requirements).
Important: Standalone does not necessarily mean a pure front-of-meter application. Companies that install a standalone storage system on their premises can also operate it behind the meter and thus unlock direct cost-reduction potential. Standalone describes the structural independence from a generation plant—not the market side.
Technical fundamentals of a standalone BESS
The core technology of a standalone storage system consists of three systems that work closely together:
- BMS (Battery Management System): Monitors and protects the battery cells at the cell level – voltage, temperature, state of charge.
- PCS (Power Conversion System): The inverter that establishes the connection between the battery (DC) and the grid (AC). In a standalone BESS, the PCS is designed for bidirectional power control.
- EMS (Energy Management System): The higher-level control software that consolidates market signals, price data, forecasts, and internal operating parameters and automatically makes charging and discharging decisions.
A decisive practical advantage: A standalone storage system requires no roof space, no open space for PV modules, and no additional power generation unit. Containerized systems can be installed in a parking lot, on industrial grounds, on a brownfield site, or in a utility room – anywhere a sufficient grid connection is available or can be established.
Today, standalone systems are scalable from a few hundred kilowatt-hours up to the multi-megawatt-hour range. Starting at approximately 1 MW / 2 MWh, the systems are typically also prepared as FTM assets for the electricity market. This applies in particular to large-scale storage systems and utility-scale BESS.
Standalone BESS in FTM operation – The storage system as a market actor
In front-of-the-meter operation, the standalone storage system acts as a full-fledged electricity market participant. It buys energy cheaply and sells it at a high price—or provides system-relevant services to the transmission grid. Since there is no generation asset that takes priority or entails regulatory restrictions, flexibility in FTM operation is maximized. This also applies to the achievable revenues.
Spot market arbitrage
The most basic FTM strategy: The storage charges during low-price hours and discharges during high-price phases. The larger the daily price spread, the higher the achievable arbitrage profit. In the Day-Ahead Trading On the power exchange, this happens with a lead time that is easy to plan. With increasingly volatile prices—driven by high feeds of renewable energies and fluctuating load curves—this potential is structurally increasing.
Intraday Trading
Even more attractive revenues await operators in Intraday Trading with BESS. Electricity volumes are traded here until shortly before physical delivery. Standalone BESS systems with fast response capabilities can capitalize on short-term price distortions caused by unforeseen feed-in or load changes. The combination of spot market arbitrage and intraday trading significantly increases the capacity utilization of the storage system and thus the overall return.
Balancing energy: FCR, aFRR and mFRR
Control energy is one of the most attractive revenue streams for standalone storage. The transmission system operators (TSOs) commission providers to stabilize the grid frequency in the event of deviations by quickly connecting or disconnecting power. Battery storage systems are predestined for this task as they can respond to requests within seconds.
- FCR (Frequency Containment Reserve / Primary Control Power): Automatic frequency control, very fast (< 30 seconds). High availability premiums, low actual energy throughput.
- aFRR (automatic Frequency Restoration Reserve / Secondary Control Reserve): Automatically activated, somewhat slower response. High energy throughput, attractive combined capacity and energy prices.
- mFRR (manual Frequency Restoration Reserve / manual frequency restoration reserve): Manually retrieved, it is suitable for larger systems with high energy capacity.
Standalone storage systems without a coupled renewable energy system have a clear advantage here: You can offer balancing power without restrictions from a concurrently running feed-in priority and make your capacity fully available for the balancing market.
Momentary reserve – the fastest system service in the grid
Since January 2026, there is a new, market-remunerated revenue component for BESS operators in Germany: the Current reserve. It is the fastest ancillary service in the power grid and intervenes even before conventional frequency containment reserve (FCR) is deployed – within milliseconds. Storage systems with grid-forming inverters take on this function and receive a fixed remuneration.
This is particularly attractive for standalone BESS operators, as solely the provision of capacity is remunerated—not the energy actually delivered. This means: hardly any cycle stress, hardly any restriction on existing revenue strategies such as FCR or intraday trading. According to the transmission system operators, a 100 MW / 100 MWh storage system only needs to keep around 35 kWh of energy available for synthetic inertia.
Guide value: In the premium segment (availability > 90 %), revenues are approximately €20,000–23,000 per MW per year—predictable, stable, and compatible with the rest of the value stacking. Technical requirements include a grid-forming-capable inverter and prequalification by the relevant TSO.
Standalone BESS in BTM operation – cost reducer for companies without PV
No roof, no space, rented property, listed building – the reasons why a PV system is out of the question for many companies are diverse. A standalone storage system delivers measurable economic benefits even without any generation plant. It is installed behind the meter and directly impacts the company's cost side.
Peak Shaving – Capping Peak Loads
Grid fees in Germany consist of an energy price component (€/kWh) and a capacity price component (€/kW). The capacity price is calculated based on the highest measured peak load (quarter-hourly maximum) within a billing period. A single peak load – for example, due to the brief simultaneous operation of multiple systems – can significantly increase the grid fee bill for an entire year.
A standalone storage system automatically couples as soon as a peak load is announced. It supplies the differential power from the battery before the grid connection is loaded. The result: the measured maximum power decreases, and the grid fee bill decreases with it—permanently and predictably.
Especially for companies with high and fluctuating load profiles – manufacturing plants, data centers, cold chain logistics – it is Peak Shaving one of the fastest ways to a measurable return on investment for a standalone storage system.
Load Shifting
In addition to peak shaving, a standalone storage system enables the targeted shifting of loads over time. Energy-intensive processes that draw electricity during the day when spot market prices are high can be structured so that cheaply charged storage power from low-price phases is used. Grid power consumption is shifted from expensive to affordable time windows—without requiring any adjustments to the production processes themselves. Load shifting saves grid fees and additionally pays off when dynamic electricity tariffs.
energy procurement optimization
Using its own spot market access or a corresponding supply contract, the standalone storage system can be charged specifically during hours with low prices. During hours with high prices, the company meets its demand from the storage system – instead of drawing expensive power from the grid. De facto, the effective average electricity procurement price drops without a single solar module having to be installed.
The Self-consumption optimization gains in importance the more price volatility increases. A company that has a fixed or indexed electricity supply contract today can actively benefit from market price fluctuations through a standalone storage system.
Atypical grid usage
Companies that specifically shift their electricity consumption outside of the grid's peak load times (peak load windows, HLW) will continue to benefit from reduced grid fees at least until 2029 under the so-called atypical network use (§ 19 StromNEV). A standalone storage system can automatically shift power consumption from the grid into these low-load time periods – thereby permanently securing the grid fee privilege without causing any restrictions in production operations.
Revenue Stacking: What a Standalone BESS Actually Earns
A standalone storage system that fulfills only a single task is in most cases not economically optimized. Its full potential is only unlocked through the combination of multiple revenue streams—also known as revenue stacking or value stacking.
In front-of-meter operation, this specifically means: Within a single operating year, a standalone BESS can simultaneously provide primary control reserve, engage in spot market arbitrage, be active in the intraday market, and provide instantaneous reserve — without these revenue streams mutually excluding each other. The energy management system (EMS) automatically coordinates the various markets and ensures that the battery is always deployed where the highest marginal revenue is achieved.
According to current market data (battery-charts.de), a standalone BESS in FTM operation with consistent revenue stacking currently generates around 200,000 to 300,000 euros per MW of installed capacity and year. This bandwidth reflects different system sizes, operating strategies, and market phases — but it also shows that standalone storage as a pure FTM asset has long been competitive.
I'm BTM operation are the figures naturally more project-specific, as they depend directly on the load profile, the current grid fee level, and the company's individual electricity procurement costs. As a guideline: the combined savings from peak shaving, energy procurement optimization, and atypical grid usage frequently range from a five- to six-figure euro amount per year for industrial companies — for storage sizes starting from approx. 750 kWh upwards.
→ Further: Revenue Stacking & Virtual Cycling for Battery Energy Storage Systems
Regulatory framework in Germany
The regulatory framework for standalone storage systems in Germany has improved significantly in recent years. For operators, the following regulations are particularly relevant:
Storage privilege: Section 118 EnWG and Section 19 StromNEV
Battery storage systems that draw electricity from the grid and feed it back in later are exempt from grid fees or subject to reduced charges under certain conditions. Section 118 of the Energy Industry Act (EnWG) provides for a temporary exemption for new storage systems. This remains valid until August 4, 2029. Section 19 of the Electricity Grid Charges Ordinance (StromNEV), which applies until the end of 2028, regulates the reduction for systems operated in a particularly grid-friendly manner. Standalone operators should explicitly take this regulatory advantage into account when calculating economic viability.
MiSPeL – Market Integration of Storage Systems and Charging Points
The Federal Network Agency initiates in 2026 MiSPeL (market integration of storage systems and charging points), thereby creating an improved regulatory framework for the market integration of storage systems. For standalone operators, this means, among other things, simplified requirements for participating in balancing energy markets and clearer delimitations for metering charging and discharging processes.
Approval, MaStR and BImSchG
Standalone storage facilities starting from a certain capacity (usually from 7.5 MVA rated output) are subject to licensing requirements under the Federal Immission Control Act (BImSchG). All systems from 100 kW are in the Market Participant Registry (MaStR) to be registered. The grid connection itself follows the standard maturity process of the responsible grid operator—from the grid connection request to the connection agreement.
Profitability – What a Standalone BESS Costs and How It Pays Off
Revenue potentials are one thing, but the investment decision also depends on how much a standalone storage system costs and how quickly it pays for itself.
CAPEX: Investment costs at a glance
The capital expenditure (CAPEX) for commercial and industrial standalone BESS systems currently ranges from around €270 to €500/kWh net, depending on system size, manufacturer, and configuration — including installation, grid connection, and EMS. Larger systems starting at 1 MW generally benefit from economies of scale and tend to be at the lower end of this range. Prices have fallen significantly in recent years and are structurally continuing this trend.
OPEX and lifespan
The ongoing operating expenses (OPEX) include maintenance, insurance, software licenses for the EMS, and, if applicable, costs for an external trading service provider. They are manageable compared to conventional energy systems—a major economic advantage of battery storage systems.
Lifespan depends heavily on cycle intensity. Modern LFP cells (lithium iron phosphate) achieve 4,000 to 8,000 full charge cycles, depending on the operating strategy. With one full cycle per day, this corresponds to a calendar service life of 12 to 20 years — enough for multiple refinancing periods.
Buy or BESS-Contracting?
Those who do not want or cannot invest themselves do not have to miss out on the economic benefits of a standalone storage system. At Battery Storage Contracting CUBE CONCEPTS provides the storage system, handles operation and marketing, and shares the revenue proportionally with the site operator — with no capital investment, no technical risk, and no operational effort. Companies for which BTM deployment has not yet been financially viable can use this CPFS-Choose model to directly generate FTM revenues, finance the BESS, and later utilize it to its full extent.
Standalone vs. Co-Location – When to use which model?
Both models have their merits. The decision between standalone and co-location is not a question of the better system, but of the appropriate context:
| Standalone BESS | Co-Location BESS | |
| Mains connection | Custom NVP / shared with company | Together with RE plant |
| coupling to generation | Not required | Mandatory PV or wind |
| Primary benefit FTM | Arbitrage, grid control power, instantaneous reserve | Capture Rate, Energy Shifting |
| Primary benefit BTM | Peak Shaving, Load Shifting, Procurement Optimization | self-consumption optimization, peak shaving, load shifting, procurement optimization |
| Larger areas required? | No | Yes |
| EEG funding | No | Yes (green electricity model) |
| revenue complexity | High (Value Stacking FTM + BTM) | Medium to high |
| IRR | 10–12 % (or higher, depending on the operating model) | 8-12 % (or higher, depending on the operating model) |
| Ideal target audience | Investors, industry without large areas | renewable energy plant operators, investors |
In short: Anyone who operates or is planning a renewable energy system should consider co-location. Anyone who does not have a renewable energy generator—or cannot have one—will find standalone storage to be an independently profitable asset.
Conclusion
The standalone storage system is not an emergency solution for companies without a solar installation. It is an independent asset class with clear, calculable paths to return—for investors looking to tap into the electricity market as a source of revenue, as well as for industrial enterprises aiming to structurally reduce their energy costs.
FTM and BTM are not mutually exclusive in this context. On the contrary: the combination of both dimensions – market participation and cost reduction – makes the standalone storage system one of the most flexible energy assets of all. It doesn't need a roof, large open spaces, or EEG subsidy logic. It needs available grid capacities – and a smart operating strategy.
Anyone operating in a market with increasing price volatility today and wondering whether a battery storage system makes sense even without PV has received a clear answer with this article: Yes – and for more than one reason.