I am Holger Roswandowicz — independent energy engineer and BESS expert. It started with batteries in 1984: as battery charging warden for a helicopter squadron, I ran the pilots' aircraft batteries and the airfields' power supply. Forty years later, batteries are still the work. For 17 of those years my firm has run DIN EN 16247-1 energy audits across industry, biogas, food retail, hotels, airports and municipalities. That practice taught us one thing: the money is lost in contracts, metering and settlement — not in the hardware. Today we bring the same forensic, register-true rigour to battery storage trading the power markets, across 35 markets worldwide.
Take the whole chain, or just the piece you need. Always vendor-neutral, always register-true.
Dispatch optimization, the Decke benchmark, revenue strategy, and reconciliation of model against real settlement. The core engine, applied to your battery.
Grid and site screening, the business case, and an independent bankability view — the honest number before you invest, not the vendor's.
DIN EN 16247-1 audits, ISO 50001, transformer & load-profile analysis. 17 years of forensic practice — now applied to storage.
Permitting, grid connection, sizing and technology selection, EPC and investor brokerage — all the way to commissioning and live trading.
For every ≥1 MW battery we compute the Decke: the most it could have earned trading the day-ahead curve with perfect foresight. It is not a promise — it is a neutral reference. Without it, no investor knows whether a battery was traded well or simply left money on the table. That is the real bankability question.
We compute it for 35 markets, from public data, independent of any vendor or trader.
See the live market radar →The path from hands-on audits to a data platform that benchmarks batteries against the market.
Battery charging warden for a helicopter squadron in former East Germany — responsible for the pilots' aircraft batteries and the airfields' power supply, after a four-week course at the Akkumulatorenwerk Zwickau. Forty years with batteries and power systems begin here.
The engineering degree on top of hands-on practice — three more decades of energy work follow.
BAFA-certified audits across industry, biogas, food retail, hotels, fitness, airports and municipalities — 1.2 GW of PV supervised.
Our own measurement practice for transformers, KWK, PV and grid — long before it was fashionable.
17 years of audit findings turned into a platform: 14% of yield routinely lost in penalty zones and settlement gaps, made visible per asset from open market data.
The practice it was always meant to be: batteries trading the power markets, optimized to the Decke, across 35 markets — at stromfee.cloud.
Call directly — or leave your details and we'll come back to you. International inquiries welcome.