SanPen/GridCal
Oct 2024 – Feb 2026
17 Months active
Languages Used
PythonShellUIXMLreStructuredTextrstC++Excel
Technical Skills
API DocumentationAPI IntegrationBackend DevelopmentBug FixingBuild SystemsCircuit Simulation
Santiago Peñate Vera
PROFILE
Santiago Peñate Vera
Santiago Penate Vera developed and maintained the GridCal repository, delivering advanced power systems modeling and simulation capabilities for planning and operations. He engineered features such as three-phase power flow, state estimation, and grid reduction, integrating technologies like Python, Qt, and Numba to optimize performance and usability. Santiago refactored core modules for maintainability, improved data compatibility with MATPOWER and CGMES formats, and enhanced the user interface for time series navigation and device management. His work emphasized robust testing, modular code structure, and cross-team integration, resulting in a reliable, extensible platform that supports complex grid analysis and decision-making workflows.
Overall Statistics
Feature vs Bugs
74%Features
Repository Contributions
1,843Total
Bugs
239
Commits
1,843
Features
664
Lines of code
3,365,706
Activity Months17
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18 peopleShared Repositories
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Work History
February 2026
6 Commits • 4 Features
Feb 1, 2026February 2026 monthly summary for SanPen/GridCal focused on delivering data compatibility improvements, grid simulation enhancements, and UI/usability refinements that drive reliability, testability, and business value. Delivered cross-cutting changes across data handling, power flow features, and test infrastructure while maintaining code quality through refactors.
6 Commits • 4 Features
Feb 1, 2026February 2026 monthly summary for SanPen/GridCal focused on delivering data compatibility improvements, grid simulation enhancements, and UI/usability refinements that drive reliability, testability, and business value. Delivered cross-cutting changes across data handling, power flow features, and test infrastructure while maintaining code quality through refactors.
February 2026
January 2026
2 Commits • 2 Features
Jan 1, 2026January 2026: Focused on delivering user-facing time series navigation enhancements and code quality improvements for SanPen/GridCal. Achieved a smoother, more discoverable time-series exploration in the GUI, reduced technical debt through refactoring, and enhanced documentation for faster onboarding and maintenance.
January 2026
2 Commits • 2 Features
Jan 1, 2026January 2026: Focused on delivering user-facing time series navigation enhancements and code quality improvements for SanPen/GridCal. Achieved a smoother, more discoverable time-series exploration in the GUI, reduced technical debt through refactoring, and enhanced documentation for faster onboarding and maintenance.
December 2025
10 Commits • 3 Features
Dec 1, 2025December 2025 focused on delivering business-value through core VeraGrid improvements, UI refinements, and expanded power grid analysis capabilities for SanPen/GridCal, while tightening developer experience. Key updates include VeraGrid Core Improvements and RMS Editor UX (version 5.6.2) with integration enhancements and workflow/interoperability fixes; VeraGrid User Interface Enhancements (About dialog, updated icons, refined analysis dialog); Power Grid Analysis Enhancements (grid reduction, contingency filtering, short circuit analysis/state estimation, short circuit event handling, distributed slack options) with testing; and workspace cleanup by removing unnecessary workspace.xml to streamline IDE configuration. These efforts improved user productivity, analysis reliability, and cross-system interoperability, enabling faster, safer grid decision-making.
10 Commits • 3 Features
Dec 1, 2025December 2025 focused on delivering business-value through core VeraGrid improvements, UI refinements, and expanded power grid analysis capabilities for SanPen/GridCal, while tightening developer experience. Key updates include VeraGrid Core Improvements and RMS Editor UX (version 5.6.2) with integration enhancements and workflow/interoperability fixes; VeraGrid User Interface Enhancements (About dialog, updated icons, refined analysis dialog); Power Grid Analysis Enhancements (grid reduction, contingency filtering, short circuit analysis/state estimation, short circuit event handling, distributed slack options) with testing; and workspace cleanup by removing unnecessary workspace.xml to streamline IDE configuration. These efforts improved user productivity, analysis reliability, and cross-system interoperability, enabling faster, safer grid decision-making.
December 2025
November 2025
8 Commits • 2 Features
Nov 1, 2025November 2025 Monthly Summary for SanPen/GridCal (developer): Delivered substantial grid modeling and analysis enhancements, plus UI/data management improvements, with upstream integration and stability fixes to support reliable planning and operations. Focused on business value and technical excellence across modeling accuracy, data handling, and cross-team collaboration.
November 2025
8 Commits • 2 Features
Nov 1, 2025November 2025 Monthly Summary for SanPen/GridCal (developer): Delivered substantial grid modeling and analysis enhancements, plus UI/data management improvements, with upstream integration and stability fixes to support reliable planning and operations. Focused on business value and technical excellence across modeling accuracy, data handling, and cross-team collaboration.
October 2025
8 Commits • 3 Features
Oct 1, 2025October 2025 monthly performance summary for SanPen/GridCal. Delivered major feature enhancements to GridCal's PTDF reduction path, refactored topology processing, and introduced tooling to improve code quality and data model clarity. Also completed a merge commitment integration to unify changes from an adjacent branch, ensuring release integrity and test stability.
8 Commits • 3 Features
Oct 1, 2025October 2025 monthly performance summary for SanPen/GridCal. Delivered major feature enhancements to GridCal's PTDF reduction path, refactored topology processing, and introduced tooling to improve code quality and data model clarity. Also completed a merge commitment integration to unify changes from an adjacent branch, ensuring release integrity and test stability.
October 2025
September 2025
88 Commits • 45 Features
Sep 1, 2025September 2025 focused on stabilizing core modeling and expanding capabilities while advancing release readiness. Key outcomes include a major API refactor with SE code integration, performance and reliability improvements in analysis workflows, and expanded grid modeling features (HVDC-to-VSC conversion, PTDF-based planning, and procedural/grid analysis). In addition, UI/visualization improvements and documentation updates support better decision-making and onboarding. Release readiness progressed with version bumps and Python 3.13 test updates.
September 2025
88 Commits • 45 Features
Sep 1, 2025September 2025 focused on stabilizing core modeling and expanding capabilities while advancing release readiness. Key outcomes include a major API refactor with SE code integration, performance and reliability improvements in analysis workflows, and expanded grid modeling features (HVDC-to-VSC conversion, PTDF-based planning, and procedural/grid analysis). In addition, UI/visualization improvements and documentation updates support better decision-making and onboarding. Release readiness progressed with version bumps and Python 3.13 test updates.
August 2025
181 Commits • 69 Features
Aug 1, 2025Aug 2025 (SanPen/GridCal) delivered foundational feature work, performance improvements, and release readiness across the GridCal codebase. Key features include early gslv interface integration with set_var_bounds refactor moved into the LoModel class, migration to the pulp 3 package with updated dependencies and interfaces, and substantial improvements to the gslv-lp interface. Major bug fixes addressed critical performance and robustness gaps in MIP interfaces, multiple-island handling in state estimation, pandapower parser robustness, and measurements parsing. The concurrent SE enhancements, ward reduction refinements, and test-suite stabilization yielded more reliable optimization workflows, faster runtimes, and a smoother path to version 5.4.0. Technologies demonstrated include Python-based optimization interfaces (gslv, pulp), advanced state estimation methods, and extensive test automation for robust software delivery.
181 Commits • 69 Features
Aug 1, 2025Aug 2025 (SanPen/GridCal) delivered foundational feature work, performance improvements, and release readiness across the GridCal codebase. Key features include early gslv interface integration with set_var_bounds refactor moved into the LoModel class, migration to the pulp 3 package with updated dependencies and interfaces, and substantial improvements to the gslv-lp interface. Major bug fixes addressed critical performance and robustness gaps in MIP interfaces, multiple-island handling in state estimation, pandapower parser robustness, and measurements parsing. The concurrent SE enhancements, ward reduction refinements, and test-suite stabilization yielded more reliable optimization workflows, faster runtimes, and a smoother path to version 5.4.0. Technologies demonstrated include Python-based optimization interfaces (gslv, pulp), advanced state estimation methods, and extensive test automation for robust software delivery.
August 2025
July 2025
234 Commits • 74 Features
Jul 1, 2025July 2025 monthly summary for SanPen/GridCal: Delivered a set of high-impact features, stability fixes, and performance improvements. Focus areas included AI-driven iteration constructs, GUI workflow enhancements for 3-phase operation, and partial dynamics integration, all while improving reliability and maintainability through refactors and targeted bug fixes. This batch of work positions GridCal for the 5.4.0 release and strengthens scalability, robustness, and developer productivity.
July 2025
234 Commits • 74 Features
Jul 1, 2025July 2025 monthly summary for SanPen/GridCal: Delivered a set of high-impact features, stability fixes, and performance improvements. Focus areas included AI-driven iteration constructs, GUI workflow enhancements for 3-phase operation, and partial dynamics integration, all while improving reliability and maintainability through refactors and targeted bug fixes. This batch of work positions GridCal for the 5.4.0 release and strengthens scalability, robustness, and developer productivity.
June 2025
142 Commits • 51 Features
Jun 1, 2025June 2025 focused on delivering feature-rich enhancements to GridCal, stabilizing core optimization routines, and improving performance and maintainability. Highlights include UI enhancements for VSC graphics, early AC/DC integration in NTC optimization, reliability improvements with time-range calls, and major code cleanup to reduce complexity, all driving better planning accuracy and faster runtimes.
142 Commits • 51 Features
Jun 1, 2025June 2025 focused on delivering feature-rich enhancements to GridCal, stabilizing core optimization routines, and improving performance and maintainability. Highlights include UI enhancements for VSC graphics, early AC/DC integration in NTC optimization, reliability improvements with time-range calls, and major code cleanup to reduce complexity, all driving better planning accuracy and faster runtimes.
June 2025
May 2025
160 Commits • 63 Features
May 1, 2025May 2025 monthly summary — SanPen/GridCal: Achieved modularity, reliability, and test coverage gains with cross‑project validation. Key features delivered include isolating the compute_f function in pf_generalized_formulation.py to improve modularity and testability and refining the find_latest_version logic for reliability. Expanded PF test coverage by adding gslv‑derived results and established robust bulk PF cross‑validation between gridcal and gslv. Major bugs fixed include numerical zero correction in ys computation, activation alignment with the latest gslv GUI, round‑trip processing fixes, HVDC time‑series power flow bugs, and restoration of gslv imports. All changes were tracked with explicit commits to facilitate traceability. Technologies demonstrated include Python modularization and refactoring, CGMES and garbage data handling improvements, time‑series conversion extensions, and enhanced NTC/three‑phase workflows.
May 2025
160 Commits • 63 Features
May 1, 2025May 2025 monthly summary — SanPen/GridCal: Achieved modularity, reliability, and test coverage gains with cross‑project validation. Key features delivered include isolating the compute_f function in pf_generalized_formulation.py to improve modularity and testability and refining the find_latest_version logic for reliability. Expanded PF test coverage by adding gslv‑derived results and established robust bulk PF cross‑validation between gridcal and gslv. Major bugs fixed include numerical zero correction in ys computation, activation alignment with the latest gslv GUI, round‑trip processing fixes, HVDC time‑series power flow bugs, and restoration of gslv imports. All changes were tracked with explicit commits to facilitate traceability. Technologies demonstrated include Python modularization and refactoring, CGMES and garbage data handling improvements, time‑series conversion extensions, and enhanced NTC/three‑phase workflows.
April 2025
194 Commits • 71 Features
Apr 1, 2025April 2025: GridCal progressed significantly in security hardening, modeling fidelity, testing coverage, and release readiness. The month saw major platform enhancements, extensive refactoring for maintainability, and a disciplined versioning cadence to support faster releases.
194 Commits • 71 Features
Apr 1, 2025April 2025: GridCal progressed significantly in security hardening, modeling fidelity, testing coverage, and release readiness. The month saw major platform enhancements, extensive refactoring for maintainability, and a disciplined versioning cadence to support faster releases.
April 2025
March 2025
208 Commits • 66 Features
Mar 1, 2025March 2025 (2025-03) was focused on delivering measurable business value through reliability, maintainability, and performance improvements in SanPen/GridCal. Key features shipped include rotation of Schematic widgets for flexible diagram layouts, drastic simplification of ContingencyIndices to improve maintainability, PSSe compatibility improvements with ongoing resolution of issue #341, and backend/API modernization comprising server scaffolding, modular FastAPI endpoints, and centralized driver creation. The work also introduced 3-phase Ybus tooling to streamline multi-circuit analysis. Major bugs fixed enhanced data exchange and rendering reliability, including fixes to results sending/parsing, removal of a server connection infinite loop, substations drawing time issues, and certificate handling reliability. Overall, these efforts strengthened data integrity, system stability, and scalability, enabling more robust simulations and faster client interactions. Technologies/skills demonstrated encompassed Python, FastAPI, API design and refactoring, data modeling improvements, UI/UX enhancements, and rigorous debugging and testing practices.
March 2025
208 Commits • 66 Features
Mar 1, 2025March 2025 (2025-03) was focused on delivering measurable business value through reliability, maintainability, and performance improvements in SanPen/GridCal. Key features shipped include rotation of Schematic widgets for flexible diagram layouts, drastic simplification of ContingencyIndices to improve maintainability, PSSe compatibility improvements with ongoing resolution of issue #341, and backend/API modernization comprising server scaffolding, modular FastAPI endpoints, and centralized driver creation. The work also introduced 3-phase Ybus tooling to streamline multi-circuit analysis. Major bugs fixed enhanced data exchange and rendering reliability, including fixes to results sending/parsing, removal of a server connection infinite loop, substations drawing time issues, and certificate handling reliability. Overall, these efforts strengthened data integrity, system stability, and scalability, enabling more robust simulations and faster client interactions. Technologies/skills demonstrated encompassed Python, FastAPI, API design and refactoring, data modeling improvements, UI/UX enhancements, and rigorous debugging and testing practices.
February 2025
76 Commits • 23 Features
Feb 1, 2025February 2025 — SanPen/GridCal: Focused on release engineering, parsing reliability, and simulation accuracy, delivering a robust baseline for production with improved developer UX and stronger tests. Major release engineering delivered version bumps from 5.3.5 through 5.3.14 with release notes, plus targeted refactors and performance enhancements. Parsing and import reliability improved with enhanced UCTE parsing, PSSe import fixes, and resilience against incomplete reads and request loading failures. Developer experience and performance were improved via Interactive Console enhancements, a new format_lines utility, and dependency upgrades (brotlicffi), along with early gslv integration. Testing and quality uplift included transformer test refactors and expanded Sbase tests. New grid modeling features added ACDC paper grids and a grid layout; LM improvements increased usability and accuracy. These efforts reduce release risk, boost modeling fidelity, and speed up iteration cycles.
76 Commits • 23 Features
Feb 1, 2025February 2025 — SanPen/GridCal: Focused on release engineering, parsing reliability, and simulation accuracy, delivering a robust baseline for production with improved developer UX and stronger tests. Major release engineering delivered version bumps from 5.3.5 through 5.3.14 with release notes, plus targeted refactors and performance enhancements. Parsing and import reliability improved with enhanced UCTE parsing, PSSe import fixes, and resilience against incomplete reads and request loading failures. Developer experience and performance were improved via Interactive Console enhancements, a new format_lines utility, and dependency upgrades (brotlicffi), along with early gslv integration. Testing and quality uplift included transformer test refactors and expanded Sbase tests. New grid modeling features added ACDC paper grids and a grid layout; LM improvements increased usability and accuracy. These efforts reduce release risk, boost modeling fidelity, and speed up iteration cycles.
February 2025
January 2025
184 Commits • 64 Features
Jan 1, 2025January 2025 (SanPen/GridCal): Focused on stabilizing generalized power flow testing, expanding data ingestion capabilities, and strengthening ACOPF integration. Key outcomes include reliable Generalized PF tests, generator availability profiling with propagation into ACOPF, matpower parsing enhancements with matacdc case support, HVDC option control in generalized PF, and targeted ACOPF migration bug fixes. These efforts improve modeling fidelity, reduce regression risk, and accelerate readiness for production deployment. Additional improvements in documentation and testing infrastructure contributed to overall code quality and maintainability.
January 2025
184 Commits • 64 Features
Jan 1, 2025January 2025 (SanPen/GridCal): Focused on stabilizing generalized power flow testing, expanding data ingestion capabilities, and strengthening ACOPF integration. Key outcomes include reliable Generalized PF tests, generator availability profiling with propagation into ACOPF, matpower parsing enhancements with matacdc case support, HVDC option control in generalized PF, and targeted ACOPF migration bug fixes. These efforts improve modeling fidelity, reduce regression risk, and accelerate readiness for production deployment. Additional improvements in documentation and testing infrastructure contributed to overall code quality and maintainability.
December 2024
140 Commits • 54 Features
Dec 1, 2024December 2024 – SanPen/GridCal: Delivered release preps, reliability improvements, and core PF enhancements that translate into faster release cycles, more accurate grid modeling, and a more maintainable codebase. Key activities included dual release-prep runs (5.3.0a2 and 5.3.0a3) with notes and bumps; refactoring to move line tap to the branch parent; extensive generalized power flow work with v1 completed and v2 under active rework; added CDF expectation calculations and an explicit error metric to quantify numerical accuracy; performance and scalability improvements in adjacency matrices (Lil to COO) and ACDC indexing; plugin/UI enhancements enabling external windows and version display; and broader testing improvements with PTDF/NTC/topology tests passing, plus documentation updates. These efforts collectively improve reliability, scalability, and speed of GridCal for planning and operation use.
140 Commits • 54 Features
Dec 1, 2024December 2024 – SanPen/GridCal: Delivered release preps, reliability improvements, and core PF enhancements that translate into faster release cycles, more accurate grid modeling, and a more maintainable codebase. Key activities included dual release-prep runs (5.3.0a2 and 5.3.0a3) with notes and bumps; refactoring to move line tap to the branch parent; extensive generalized power flow work with v1 completed and v2 under active rework; added CDF expectation calculations and an explicit error metric to quantify numerical accuracy; performance and scalability improvements in adjacency matrices (Lil to COO) and ACDC indexing; plugin/UI enhancements enabling external windows and version display; and broader testing improvements with PTDF/NTC/topology tests passing, plus documentation updates. These efforts collectively improve reliability, scalability, and speed of GridCal for planning and operation use.
December 2024
November 2024
164 Commits • 59 Features
Nov 1, 2024November 2024 was focused on delivering foundational generalized modeling capabilities, improving data architecture, and strengthening release readiness for GridCal. Key work included introducing BranchGroupTypes and PfGeneralizedFormulation, moving numerical circuit compilation to the compiler for faster builds, and laying groundwork for indices-based workflows with indices generation and a slice method in GeneralizedSimulationIndices. Significant refactors modernized data models (branch_data -> passive_branch_data / active_branch_data), packaging robustness, and UI improvements (GridCalMainGUI and set_circuit enhancements). Release orchestration and documentation were advanced with version bumps and updated READMEs/Matpower results, enabling smoother validation and deployment.
November 2024
164 Commits • 59 Features
Nov 1, 2024November 2024 was focused on delivering foundational generalized modeling capabilities, improving data architecture, and strengthening release readiness for GridCal. Key work included introducing BranchGroupTypes and PfGeneralizedFormulation, moving numerical circuit compilation to the compiler for faster builds, and laying groundwork for indices-based workflows with indices generation and a slice method in GeneralizedSimulationIndices. Significant refactors modernized data models (branch_data -> passive_branch_data / active_branch_data), packaging robustness, and UI improvements (GridCalMainGUI and set_circuit enhancements). Release orchestration and documentation were advanced with version bumps and updated READMEs/Matpower results, enabling smoother validation and deployment.
October 2024
38 Commits • 11 Features
Oct 1, 2024October 2024: Delivered foundational reliability, performance, and ecosystem improvements for GridCal. Implemented ERCOT raw file reading fixes, comprehensive bug fixes and type corrections across modules, and introduced configurable compiled arrays to enhance performance control. Strengthened NumPy 2.0 compatibility while maintaining backward compatibility with older NumPy versions, and expanded tests for migration scenarios. Completed release engineering steps including version bumps (5.1.59) and release readiness for 6.0.0, with licensing migrated to MPL-2.0. Improved UX and docs: About dialog enhancements, ReadTheDocs fixes and docs compilation, and added missing API modules. Added new capabilities such as detect_facilities and enhanced data ingestion/processing. These efforts reduce onboarding time, broaden supported environments, and improve data reliability for customers.
38 Commits • 11 Features
Oct 1, 2024October 2024: Delivered foundational reliability, performance, and ecosystem improvements for GridCal. Implemented ERCOT raw file reading fixes, comprehensive bug fixes and type corrections across modules, and introduced configurable compiled arrays to enhance performance control. Strengthened NumPy 2.0 compatibility while maintaining backward compatibility with older NumPy versions, and expanded tests for migration scenarios. Completed release engineering steps including version bumps (5.1.59) and release readiness for 6.0.0, with licensing migrated to MPL-2.0. Improved UX and docs: About dialog enhancements, ReadTheDocs fixes and docs compilation, and added missing API modules. Added new capabilities such as detect_facilities and enhanced data ingestion/processing. These efforts reduce onboarding time, broaden supported environments, and improve data reliability for customers.
October 2024
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Quality Metrics
Correctness86.4%
Maintainability85.4%
Architecture82.2%
Performance75.8%
AI Usage20.8%
Skills & Technologies
Programming Languages
BashBinaryC++CSSCSVCythonDiaExcelHTMLJSON
Technical Skills
AC-DC Power FlowAC/DC Power FlowAI/MLAPI DesignAPI DevelopmentAPI DocumentationAPI IntegrationAPI UsageAPI developmentAdmittance Matrix CalculationAlgorithm DesignAlgorithm DevelopmentAlgorithm ImplementationAlgorithm OptimizationAlgorithm Refactoring
Repositories Contributed To
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