Independent grid code testing · For global utilities, IPPs and OEMs
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Service 01 FLAGSHIP

Grid Code Testing.

Three levels of testing — generator terminals, interconnection point, operational performance. Every codified test, verified to regulator specification, in the language the regulator reads.

Typical project6–12 weeks
Test campaigns delivered1,500+
Test scope3 levels · full code
OEM platforms covered10
AccreditationISO 17020 · 2026
LanguagesEN · ES · PT · AR
In serviceCCC Mérida · Mitsubishi Power · Mexico · Combined-cycle facility under grid code campaign
/ 01 · Who this is for

For the operators who carry the compliance burden.

Grid code testing is required for any new generation unit interconnecting to a regulated power system — and increasingly required for existing units following retrofit, repowering or regulator-mandated re-testing campaigns.

Our clients fall into five archetypes. Each one comes to us with a slightly different need, but every one of them needs the same thing in the end: a test report that survives regulator review.

/ A

IPPs & Developers

Commissioning new units. Need bankable test reports for lenders and regulator submission to reach COD.

/ B

Utilities

Connection-test campaigns for fleet additions, retrofits and dispatch-related testing under operator requests.

/ C

EPC Contractors

Handover-to-owner test campaigns. Independent third-party testing satisfies owner acceptance gates.

/ D

OEMs

Third-party verification of own equipment when regulators or lenders require independence from the supplier.

/ E

Lenders & DFIs

Independent verification supporting non-recourse project finance and bankability assessments.

In serviceEnertek Cogeneration · Mexico · HRSG inspection campaign · Siemens Energy platform
/ 02 · What we test

Three levels of testing. Every codified test, end to end.

Grid code testing is not one test — it is a coordinated campaign across the full path from the generator terminal to the dispatcher's screen. We deliver every test the applicable code requires, organized into three operational levels.

Within each level, the specific test list is tailored to the plant's technology, classification, and the requirements of the local jurisdiction's grid code.

01

Generator Terminals

Voltage and frequency control · No-load and load conditions

The first level proves the generator can do its job in isolation — that the excitation system holds voltage to setpoint, the governor responds to speed deviation, and the protective elements at the machine terminals operate correctly. These tests are run with no load and with the unit synchronized to the grid, but evaluated against the generator's own electrical reference frame.

  • Open-circuit saturation characteristic
  • Short-circuit saturation characteristic
  • AVR step response — voltage reference
  • AVR limiter verification (OEL · UEL · V/Hz)
  • Power System Stabilizer (PSS) tuning
  • Speed-droop governor (no-load)
  • Speed-droop governor (loaded)
  • V-curves and reactive-capability traverse
  • Load rejection at multiple operating points
  • Synchronization checks and dead-bus close
  • Excitation-system small-signal stability
  • Power-island operation
02

Interconnection Point (POI)

Control · ride-through · protection · dispatch interface

The second level proves the plant behaves correctly at the boundary with the transmission system. These are the tests the system operator and the regulator weigh most heavily, because they govern how the plant responds to grid events and how it integrates with dispatch.

  • Voltage control mode (Q / V / power-factor)
  • Frequency response and droop characteristic
  • Primary frequency control demonstration
  • ROCOF response and trip discrimination
  • Low-voltage ride-through (LVRT)
  • High-voltage ride-through (HVRT)
  • Reactive capability at POI (D-curve)
  • First energization — inrush current record
  • Electrical protections (over/under V · over/under f · distance · differential)
  • Power-island and islanded-operation behavior
  • AGC setpoint tracking · ramp · deadband
  • Telemetry and SCADA signal verification
  • Communication path latency and integrity
03

Operational Testing

Performance · reliability · startup and shutdown

The third level proves the plant operates as committed under its dispatch agreement and its market-entry filings. These tests link the physics of the asset to the economics of the wholesale market — the heat rate becomes the cost offer, the startup time becomes the dispatch eligibility window, the reliability run becomes the commercial-operation declaration.

  • Maximum continuous capability
  • Heat consumption curve · piecewise-linear submission
  • Specific heat-rate verification across operating range
  • Auxiliary load characterization
  • Load ramp rates (up and down)
  • Startup time and reliability demonstration
  • Shutdown sequence and behavior
  • Reliability run (continuous-operation demonstration)
  • Black-start capability (where applicable)
  • Performance-degradation re-verification

Test lists are illustrative of typical campaigns. The exact catalog for any engagement is determined by the plant's classification under the applicable grid code, the technology (synchronous, asynchronous, inverter-based, hybrid storage), and the requirements of the system operator and regulator.

/ 03 · What we deliver

Six concrete deliverables. One regulator-ready package.

Every Grid Code Testing engagement produces the same set of artifacts. You know exactly what arrives in your inbox at the end of the campaign — and what the regulator receives in their submission portal.

Documentation is authored in the language the regulator reads. We deliver in English, Spanish, Portuguese or Arabic — adapted to the local regulatory format.

Field commissioningCCC Mérida · Mitsubishi combined cycle · Engineers on-site for grid code testing
/ 01

Test program design

Tailored to the specific grid code, plant technology and connection scope. Reviewed with owner and regulator before mobilization.

/ 02

Raw measurement data

High-speed recordings, voltage and current waveforms, control signals, all timestamped and traceable to calibrated instrumentation.

/ 03

Test execution reports

Per-test analysis with pass/fail evaluation against grid code criteria. Plot-rich, defensible under regulator review.

/ 04

Consolidated compliance dossier

Master document that aggregates all individual test reports into a single regulator-submission package.

/ 05

Regulator submission filings

Uploaded to the relevant portal (SAPPSE in Mexico, ONS in Brazil, CEN in Chile, etc.) with full traceability.

/ 06

Post-submission defense

We respond to regulator queries, supply clarifications and stand behind the report through final approval.

/ 04 · How we deliver it

Five phases. Auditable at every step.

Every engagement follows the same disciplined methodology. Each phase produces specific deliverables that gate the next phase. Every step is documented, traceable and audit-ready.

This is the methodology that survives regulator review — and that gives lenders the confidence to release funds at acceptance milestones.

01

Pre-assessment

Regulator review. Technology fit. Scope definition. Pre-existing test data audit.

2–4 weeks
02

Test program design

Detailed test procedures across all three scope levels, instrumentation plan, mobilization logistics, regulator coordination.

3–6 weeks
03

Field execution

On-site campaign. Live testing with safety protocols, real-time data acquisition.

1–3 weeks on site
04

Model validation

Dynamic parameter identification, PSS®E and DIgSILENT tuning, EMT comparison.

4–8 weeks
05

Regulator submission

Filings, defense, query response, final approval.

Through approval
/ 05 · Instrumentation & tools

Current-generation equipment. Calibrated and traceable.

Every instrument we deploy is on a documented calibration cycle, traceable to international standards. We mobilize what the test program requires — energy quality analyzers, high-speed recorders, real-time simulators, power analyzers — plus the smaller accessories that make field connection smooth under stressful operating conditions.

Simulation work runs in three industry-standard platforms so we match whichever the regulator accepts.

Field measurement

  • High-speed digital recorders
  • Energy quality analyzers
  • Real-time simulators
  • Power analyzers
  • Voltage & current probes (calibrated)
  • GPS-synchronized timing
  • Field-tested connection accessories

Simulation & analysis software

  • Siemens PSS®E
  • DIgSILENT PowerFactory
  • EMTP

Standards we test under

  • IEEE 421.5 (excitation system models)
  • IEC 60034 (rotating machines)
  • IEC 61400 (wind turbines)
  • IEEE 1547 / IEEE 2030 (interconnection)
  • Local grid codes (CFE, ONS, CEN, CAMMESA, XM, COES)
/ 06 · Accreditation & standards

Credentialed for regulator and lender review.

Accreditation is in progress for both international (ISO/IEC 17020) and Mexican (CNE México) frameworks, expected to complete in 2026. The methodology and instrumentation already meet the technical requirements — accreditation formalizes what is already in place.

Our work is tested against international engineering standards and local grid codes in every jurisdiction we operate.

In progress · 2026

ISO/IEC 17020

International accreditation for inspection bodies. The credential international lenders and DFIs recognize for independent third-party verification.

  • Type A inspection body (full independence)
  • Power generation testing scope
  • Bilingual technical management system
In progress · 2026

CNE México

Mexican Comisión Nacional de Energía accreditation. The credential CENACE and CFE require for testing services performed within the SEN.

  • Código de Red testing scope
  • Grid code dynamic compliance
  • Spanish-language deliverables
/ 07 · Featured engagement

CCC Salamanca · 980 MW.

One of three Mitsubishi combined-cycle engagements GCE has delivered (460–980 MW range). Full plant grid code testing campaign, executed alongside Mitsubishi Power's commissioning team. Owner-side independence preserved while integrating with the OEM's startup schedule.

25 grid code tests delivered for COD — including AVR, speed governor, performance, electrical protections and power quality. Filed with CENACE through SAPPSE; approved without queries.

Reference project

Full grid code campaign delivered alongside Mitsubishi Power.

Plant
CCC Salamanca
Capacity
980 MW
Technology
Combined cycle
OEM
Mitsubishi Power
Tests delivered
25 across all three levels
Outcome
COD achieved

The plant achieved commercial operation on schedule. The compliance dossier passed CENACE review without requests for clarification — the result of a methodology that builds defensibility into every step.

Read the full case study
Languages of delivery
English EN Español ES Português PT العربية AR

Reports authored in the regulator's language and adapted to local submission format.

/ 08 · Related services

Services that complete the picture.

Grid Code Testing rarely arrives alone. Most engagements combine field testing with adjacent disciplines — performance acceptance under the same mobilization, dynamic model validation tuned from the same measurement data, regulatory filings authored by the team that ran the tests.

/ 02 · Flagship

Plant Performance

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/ 03 · Flagship

Power System Studies

→
/ 04 · Growth

BESS & Storage Compliance

→
/ 05 · Growth

Compliance Filings

→
/ 09 · Start your engagement

Have a plant approaching commercial operation?
Let's discuss your scope.

Tell us about your facility, technology and target jurisdiction. We come back within two business days with scope, schedule and quote.

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