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 of CHF 15'000-40'000 per year on the demand charge and 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 for itself through CHF 15'000-40'000 in demand charge savings per 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). 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.
The costs vary widely: CHF 50’000-200’000+ depending on the distance to the nearest transformer, cable routing and permit requirements. Implementation usually 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.
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. For businesses with a 300+ kW peak load, CHF 15’000-40’000 per year is realistic. LFP battery storage lasts up to 8’000 cycles at 80% depth of discharge. 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) | CHF 15'000-40'000/year (peak shaving) |
| Payback | Never (sunk cost) | 4-6 years (through savings) |
| 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) |
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 (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.