Month: 2025-05 | Repository: NREL/ssc. Focus: deliver high-impact features, stabilize CI, expand solver validation, and refine test configurations to improve reliability and security.

April 2025 performance highlights: Delivered targeted correctness improvements and enhanced observability across NREL/SAM and NREL/ssc, driving more reliable simulations and faster regression detection. Key outcomes include per-component adjustment scope fix in SAM, test-time performance tooling in SSC with automated comparisons, and CI/CD reliability enhancements across SSC workflows. These efforts strengthen configuration accuracy, cross-branch performance visibility, and platform-accurate CI feedback, translating to higher model fidelity for customers and reduced triage time for engineers.

March 2025: Focused on test observability and performance tracking for NREL/ssc. Key feature delivered: Test Execution Time Export and Tracking via a GitHub Actions workflow and a Python log parser that converts GTest logs to CSV and uploads artifacts for cross-run and cross-branch comparison. Major bugs fixed: none reported this month. Overall impact: improved test visibility, enabling data-driven optimizations and faster iteration cycles. Technologies/skills demonstrated: CI/CD automation (GitHub Actions), Python scripting (log parsing, CSV generation), GTest log processing, artifact handling, and cross-branch analytics.

December 2024: Maintained and stabilized the NREL/SAM data path by delivering a targeted bug fix to the solar resource interpolation macro. The change ensures header rows in input data are correctly ignored and interpolation bounds are based on the maximum hour present, improving accuracy and reliability of solar resource calculations. This work reduces downstream errors in simulations and reinforces data integrity for critical analyses.

November 2024 monthly summary focusing on delivering cross-repo improvements in NREL/ssc and NREL/SAM. Key achievements include a more accurate Battery Degradation model, build-system modernization for cross-platform consistency, and workflow enhancements to reduce PR cycle time. These efforts improve asset retirement planning accuracy, reduce platform-specific build failures, and empower developers with clearer regeneration guidance.

October 2024 monthly summary for NREL/ssc: Delivered a thread-safety enhancement for the Solar Position Algorithm (SPA) by introducing a solarpos_lookup class and a lookup table. The change encapsulates internal SPA state and enables safe concurrent SPA calculations across threads, improving reliability and scalability in multi-threaded workloads. This work involved refactoring SPA for thread-safety and sets the stage for future concurrency optimizations. The update is tracked under commit 77b85d461a22367f0fb5c27a19c46d9bf40ad7c8 with the message 'make spa threadsafe again (#1232)'. Major bugs fixed this month: none reported; the focus was on robustness and concurrency improvements. Technologies demonstrated: multi-threading design, C++ class encapsulation, and data-structure-backed lookup tables.