Battery storage can in many cases delay or entirely replace grid expansion: it caps power peaks through peak shaving instead of expanding the grid connection for CHF 50'000-200'000. Unlike grid expansion, the storage generates ongoing savings: around CHF 10'800 a year per 100 kW of peak capped (median demand charge 2026, ElCom). Combined with self-consumption and balancing energy it pays back in 4-6 years. Grid expansion remains unavoidable only when the permanent base load exceeds the connection capacity.
Key Takeaways
7 min read
Key Takeaways
7 min read- Battery storage can in many cases delay or entirely replace grid expansion measures: through intelligent peak shaving that caps power peaks before they overload the grid connection.
- Grid expansion is a sunk cost with no ongoing savings. Commercial storage pays back in 4-6 years through peak shaving, self-consumption and balancing energy; 100 kW of peak capped alone saves around CHF 10'800 a year.
- The break-even depends on the grid operator's demand charge and the load profile: the higher the peak load and the more CHF/kW is billed, the sooner the storage pays off.
- In many cases the optimal strategy is a combination: storage now, grid expansion in 3-5 years once the load profile is stable.
When industrial businesses commission PV systems, charging stations or new production lines, they regularly hit the limits of their grid connection. The traditional answer: CHF 50’000-200’000+ for grid expansion (transformer upgrade, new cable routes; Ampere Dynamic experience from grid connection applications 2022 to 2026). But battery storage can often achieve the same result at lower cost and, on top of that, generate ongoing savings through peak shaving. This guide compares both investment paths on the basis of data.
The problem: connection capacity at its limit
The grid connection has a fixed capacity limit in kVA or kW. It was sized when the building was built, for the electricity demand of the time, and today it is often too small.
Three triggers push many businesses to the limit: adding EV charging infrastructure (a single DC fast-charging station needs 150-400 kW), new production lines with high start-up power, or the operation of heat pumps. As soon as the power peaks exceed the grid connection capacity, the grid operator is obliged to initiate grid expansion.
Whoever needs more connection capacity submits a grid connection application to the distribution grid operator; the procedure, grid cost contribution and connection contribution are governed by the VSE industry recommendation on grid connection. The costs vary widely: CHF 50’000-200’000+ depending on the distance to the nearest transformer, cable routing and permit requirements (Ampere Dynamic experience). In Ampere Dynamic’s experience, implementation takes 6-18 months, because the grid operator coordinates planning, permits and execution. During that time new consumers often cannot be put into operation.
Battery storage as the alternative
Commercial storage solves the capacity problem in a more economical way: instead of expanding the grid connection, the storage caps the demand peaks that would overload the connection.
Peak shaving is the core mechanism: the storage charges in low-load phases and discharges specifically into the load peaks. The result: the measured peak load falls, and with it the monthly demand charge that most Swiss grid operators bill on the month’s maximum load: in 2026 a median of CHF 108 per kW and year for a 400 kW business (ElCom tariff data, profile C6, Ampere Dynamic analysis). That the demand charge determines the business case, and that a PV system alone does not catch the peak on cloudy days, is shown by the study Peak-Shaving mit Photovoltaik und Batterie by the FHNW for the Canton of Aargau (2022).
Load shifting complements peak shaving: the storage charges overnight or at low grid prices and releases the energy during daytime load peaks. The existing grid connection can thus effectively serve a higher total load without being expanded.
In addition, the storage generates ongoing savings on the demand charge. Every kilowatt capped for good saves a median of CHF 108 a year in 2026, so 100 kW saves around CHF 10’800 (ElCom tariff data, profile C6). Higher self-consumption of PV electricity and revenue from balancing energy come on top; only together do they carry the 4 to 6 year payback. LFP battery storage is specified for up to 8’000 cycles at 80% depth of discharge (datasheet figures from the cell manufacturers CATL and BYD). That corresponds to 20+ years of operation in daily use.
The comparison
Battery storage vs grid expansion: investment comparison
| Feature | Grid expansion (transformer/cable) | Battery storage |
|---|---|---|
| Investment | CHF 50'000-200'000+ (one-off) | CHF 80'000-300'000 (depending on capacity) |
| Ongoing savings | None (pure capacity expansion) | Around CHF 10'800/year per 100 kW of peak capped (peak shaving, median 2026) |
| Payback | Never (sunk cost) | 4-6 years (peak shaving, self-consumption and balancing energy combined) |
| Additional benefits | Higher connection capacity | Peak shaving, self-consumption, backup power |
| Flexibility | Fixed installation, not scalable | Modular, expandable |
| Implementation time | 6-18 months (grid operator) | 2-4 months (independent) |
| Eligible for subsidies | No | Yes (cantonal, e.g. TG CHF 1'000) |
The investment ranges in the table are Ampere Dynamic experience for systems from 100 kWh to 2 MWh; the grid expansion lead times come from our own grid connection applications. Cantonal storage subsidies are the exception: in 2026 the Canton of Thurgau pays a flat CHF 1’000 for storage from 10 kWh (Canton of Thurgau energy subsidy programme 2026). Since 2026, a refund of grid fees can also be applied for on electricity that flows from the grid into the storage and back into the grid (Fedlex, StromVG Art. 14a).
When you still need grid expansion
Battery storage is not a universal answer to every capacity problem. In three scenarios there is no way around grid expansion.
Base load permanently exceeded: If it is not the peak load but the continuous base load that permanently exceeds the grid connection, no storage can help. Storage caps peaks. It cannot replace a continuous sustained draw that exceeds the capacity.
Very high charging capacity: Whoever wants to operate more than 400 kW of DC charging capacity continuously (experience from the Hugelshofer Services charging park; for instance for large e-truck fleets with several simultaneous fast-charging sessions) usually needs both: storage and an expanded grid connection.
Renovation planned anyway: If the building is being renovated and the electrical connection has to be renewed regardless, the combined grid expansion is worthwhile.
The most practical approach in many cases: install battery storage now to solve the capacity problems immediately and realise peak-shaving savings. Grid expansion in 3-5 years, once the load profile of the new consumers is stable and easier to plan for, and once grid expansion costs are likely to have fallen.
For a deeper look at peak shaving as the most important value driver, see Peak shaving for businesses. The technical basis is explained in Commercial storage in Switzerland.