Stock code
300693
In our previous edition, we explored Hungary and examined how local grid compliance can help energy-storage projects accelerate market entry and progress from successful grid connection to multi-market operation.
This time, we turn to Czechia.
Under Aurora Energy Research's base-case assumptions, a two-hour BESS commissioned in Czechia in 2026 could achieve an IRR above 15% and pay back within five years.
For investors, however, realising these returns depends on one critical condition:
Can the project complete grid-connection acceptance and enter commercial operation on schedule?
In Czechia, timely grid connection depends not only on product certification and onsite construction. It also hinges on an element that can easily be overlooked during early project development: simulation-model validation.
EN 50549 grid-compliance certification and relevant IEC safety requirements provide an important foundation for PCS market entry in Czechia, but they do not represent the complete grid-connection process.
Czechia’s distribution network is primarily operated by three distribution system operators (DSOs):
ČEZ Distribuce, covering most of the country;
EG.D, primarily covering South Bohemia, South Moravia and several other areas;
PREdistribuce, primarily covering Prague and Roztoky.
Although all three DSOs conduct grid-connection assessments under the Czech Distribution System Operation Rules (PPDS), their requirements may differ slightly across model formats, parameter ranges, simulation studies and onsite acceptance procedures. Projects therefore need to prepare for the requirements of the relevant DSO and connection point rather than relying solely on general product certification.
For Category B2 BESS projects with a rated power of at least 1 MW but below 30 MW, model-related validation can generally be divided into two stages.
Projects need to submit a simulation model corresponding to the actual PCS model, control-software version and plant configuration.
The model must demonstrate the dynamic response of the PCS and overall plant under relevant operating conditions, including frequency changes, voltage disturbances, fault ride-through, and active- and reactive-power control.
The relevant DSO determines the required model format, parameter scope and simulation outputs according to the project and connection point.
After model validation, onsite testing may also be required to verify that the plant’s actual behaviour is consistent with the model predictions.
The model must therefore do more than simply run. It must accurately represent how the PCS, PPC, BMS, EMS, protection system and other plant-level equipment operate together under real conditions.
Through model validation, the DSO and other project stakeholders need to confirm:
how the PCS responds to voltage and frequency changes;
whether protection settings and control logic meet grid-connection requirements;
whether the PCS, BMS, EMS and plant controller coordinate correctly;
whether simulation results accurately reproduce onsite equipment behaviour.
If the model is incomplete, its parameters do not match the project, or its results differ significantly from onsite testing, the project may face model revisions, resubmission and repeated testing.
In one Czech project encountered by SINEXCEL, the customer had previously faced a grid-connection delay of more than a year because an existing simulation model failed validation. This delayed commercial operation and affected expected returns.
For Czech projects, simulation models should therefore be assessed during PCS selection and grid-connection design—not left until the commissioning stage.
System integrators, EPCs, developers and investors should look beyond power ratings, efficiency and product certification when selecting a PCS. Four additional questions should be addressed with the supplier.
Customers should confirm whether the model corresponds to the actual PCS model, control version and project configuration rather than relying on a generic product model.
If no model is available, the supplier should clarify how long model development, internal validation and delivery will take.
Different DSOs may impose different requirements for model files, parameter ranges and validation procedures.
The supplier must be able to adapt the model to the specific connection point, avoiding late-stage discoveries that the file format or model behaviour does not meet acceptance requirements.
The model must accurately reflect the PCS’s actual control behaviour.
If simulation results differ significantly from onsite tests, the project may still face model revisions, repeated testing and grid-connection delays.
Model validation is rarely completed through a single submission.
When DSO requirements, EPC designs or project configurations change, the supplier’s ability to update parameters, investigate discrepancies and support onsite commissioning can directly affect how quickly issues are resolved and final acceptance is achieved.
A simulation model is not simply a digital product description. It is an engineering representation of the PCS’s control logic and dynamic behaviour.
Building and validating the underlying modelling platform can take a year or longer, requiring expertise across converter control, grid codes, simulation tools, equipment testing and onsite operation.
SINEXCEL has established a simulation-modelling team of approximately 10 to 15 specialists, covering both C&I and utility-scale PCS platforms.
Supported by an established modelling platform and reusable model library, SINEXCEL can typically reduce the model-development cycle for a new product to approximately two to three months, depending on the project scope and validation requirements.
Simulation models are currently available for the following SINEXCEL PCS platforms:
Sirius 135K, 160 kW and 500 kW PCS;
1725 kW utility-scale PCS.
The model package for the new-generation utility-scale StellaON PCS is scheduled for completion in October, further expanding SINEXCEL’s simulation-model coverage for utility-scale applications.
Preparing models early helps identify and resolve potential parameter, interface and control issues before they emerge during grid-connection commissioning.
SINEXCEL currently supports more than 500 MW of BESS projects across Czechia and Slovakia.
These projects enable the modelling team to continuously connect digital simulations with real onsite conditions, including:
protection-parameter configuration;
interface coordination between the PCS, BMS, EMS and plant controller;
control requirements at different connection points;
comparison between simulation and onsite test results;
DSO acceptance and issue resolution.
These capabilities create different forms of value for each project stakeholder.
For system integrators and EPCs:
Fewer repeated tests, model revisions and onsite technical modifications, helping reduce uncertainty during commissioning.
For developers:
A clearer path through DSO review and grid-connection acceptance, improving confidence that projects can enter operation on schedule.
For investors and asset owners:
Lower revenue risk associated with delayed commercial operation, supporting more reliable project schedules, payback expectations and cash-flow forecasts.
The objective is not simply to submit a model successfully. It is to establish a continuous path from PCS selection and model validation to onsite commissioning and final grid-connection acceptance.
Ancillary services remain an important revenue source for Czech BESS projects today. As renewable deployment and market-price volatility increase, energy arbitrage is expected to play a growing role.
Regardless of which markets a project enters, the first condition for generating revenue remains the same:
Achieving grid connection and entering commercial operation on time.
Drawing on more than 500 MW of project experience across Czechia and Slovakia, SINEXCEL is turning its model-development capabilities and onsite commissioning experience into less repeated work, more predictable grid-connection delivery and lower commercial-operation delay risk.
Czechia and Slovakia mark another important chapter in SINEXCEL’s energy-storage journey across Eastern Europe.
Next stop: Croatia—where a small installed base is opening the door to a much larger storage opportunity.
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