BESS in industrial use: what battery storage can — and cannot — deliver

BESS for industrial customers: opportunities and risks in the German market

Battery energy storage systems (BESS) are increasingly moving into focus for industrial decision-makers in Germany. The rationale is clear: volatile power prices, rising redispatch costs, and a shifting regulatory environment create new degrees of freedom—but also new risks. Those who set the right priorities today can use BESS strategically in procurement; those who underestimate the complexity risk mis-investments.

Why BESS matters for industrial users

The German power system is in transition. Accelerated renewables build-out, the nuclear phase-out, and the ongoing coal exit create structural demand for short-term flexibility. Batteries can provide that flexibility—not only for grid operators and suppliers, but increasingly for large industrial consumers that want to actively manage energy costs.

Roughly 4.66 GWh of installed BESS capacity is connected in Germany today. Transmission-level grid connection enquiries alone stand at about 211 GW, illustrating how dynamic the market is. For industrial buyers, that means storage markets evolve quickly while framework conditions move in parallel—waiting too long can mean losing competitive edge.

Bidirectional BESS can react to price signals in near real time: charge in periods of low wholesale prices and discharge in high-price periods. For firms with high, plannable consumption, that opens arbitrage, peak shaving, and participation in ancillary services markets.

Concrete opportunities

The most attractive industrial use case is often peak-load reduction. A large share of German grid charges is based on measured demand peaks. If you can shave peaks with controlled discharge, you can sustainably reduce grid charges without curtailing production.

BESS can also participate in ancillary services markets—primary control, secondary control, and minute reserve reward fast-responding assets. With adequate sizing and control systems, these revenues can materially improve the business case.

Another lever is self-consumption optimisation, especially alongside onsite PV. As we explain in why solar alone is not enough, PV only delivers its full value when generation, consumption, and storage are coordinated intelligently. BESS is often the missing link.

Finally, evolving regulation opens a new revenue path: dynamic grid charges. Within the AgNes process, the Federal Network Agency (BNetzA) has proposed steering BESS via a two-part grid charge combining a financing component and an incentive component that varies in 15-minute steps with local congestion. Discharging instead of charging in stressed periods can, in principle, earn negative charges—i.e. payments. For controllable loads and storage, that is a real revenue lever.

Risks decision-makers must understand

The industrial BESS case stands or falls on regulatory predictability—and that is the core risk. Under Section 118(6) of the German Energy Industry Act (EnWG), BESS commissioned before 4 August 2029 can currently receive a 20-year grid-charge exemption. The BNetzA has signalled it will not extend that relief indefinitely; future grid-charge design therefore injects material uncertainty into any investment horizon beyond 2029.

Revenue stability is another concern. German BESS projects are developed without direct subsidies and depend on wholesale and ancillary-services revenues. As competition intensifies and battery prices stabilise, margins compress. Anyone planning storage today must stress-test how arbitrage spreads and ancillary markets may evolve over five to ten years—and reflect that uncertainty in financing structures.

Operational strategy matters too. BESS can be operated in grid-supporting, neutral, or grid-stressing ways. Optimising purely on wholesale signals without local congestion awareness may increase future grid charges if the plant charges during scarcity periods. Today’s price signals are still incomplete, but dynamic grid charges aim to change that. Investments made now should implement control logic that can respond to such signals.

What the evolving grid-charge regime means for industry

The AgNes process is relevant not only for developers but directly for industrial customers with onsite storage. The planned dynamic component acts as a time-varying price signal computed per 15-minute interval. In regions with positive redispatch—where the grid is overloaded and local generation must be ramped—withdrawal charges rise while feed-in charges fall; where there is no congestion, no charge applies.

For industrial users, site location, local grid stress, and the ability to react every 15 minutes become economic drivers. A plant that chronically charges during local stress will face higher charges; the same asset discharging in those windows could be rewarded. That requires materially more sophisticated dispatch than today.

Calibration matters: dynamic charges must be high enough to change behaviour. German wholesale spreads in volatile phases often reach €100–200/MWh; a grid charge of only a few euros per MWh will not steer operators. Until final levels are known, part of the future revenue picture remains fuzzy.

How industrial firms should proceed

The storage decision is strategic, not purely technical. It depends on load shape, site, existing generation assets, and risk appetite. Anyone investing today should secure three things.

First, operating strategy must be flexible enough to respond to dynamic price signals—whether day-ahead wholesale or future grid-charge signals. A purely static charging strategy will destroy revenue potential over time.

Second, investment cases should use conservative revenue assumptions. Ancillary markets are getting crowded, arbitrage spreads swing, and the future grid-charge regime is not final. Optimistic-only scenarios invite disappointment.

Third, do not treat storage in isolation. The interaction of BESS with existing supply contracts, PPAs, and the company’s load profile determines realised value. We also discuss how regulation shapes flexibility build-out in renewables expansion and regulatory headwinds.

BESS offers German industrial customers real opportunities—from peak shaving and ancillary services to future revenues from dynamic grid charges. The risks are non-trivial: regulatory uncertainty, margin pressure, and rising control requirements demand solid analysis before any investment decision. onu.energy helps large consumers navigate that complexity and embed storage strategies into a coherent procurement approach.