Customer Stories
Catalyst is used by project developers, portfolio managers and financiers — for different tasks, but with a shared requirement: transparent, auditable BESS economic analyses.
Project Developer
How to right-size a co-location battery
greentech × phelas · Germany · August 2026A repeatable method for finding the economically optimal storage size for a PV co-location project: 42 business cases across 2 PV generation profiles. The right-sized battery lifts project IRR from 8.69% to 9.35% — the optimum sits at 40% of the grid connection over 3 hours.
No transformer maps exactly to the optimum — the planned design (~45% / 2.8 h) around a standardised transformer station still sits on the value plateau.
Project Developer
Wind Power Plus BESS — a joint study with Fluence
phelas × Fluence · Germany · July 2026Techno-economic study of a 25 MW co-located wind + BESS project: 125 configurations, 5 forward price scenarios (2027–2056). Finding: the BESS lifts the IRR floor by 1.0 pp — every scenario clears the 8% WACC hurdle. BESS earns 26–51% of revenue from just 17–29% of CapEx.
Sizing the BESS to eliminate curtailment destroys €18–€29M of NPV. The economic optimum is reached well before zero curtailment.
Portfolio Manager
Optimal Portfolio of an IPP
Maxsolar × phelas · Germany · 2026phelas analysed 900 portfolio configurations on a 100 MW grid connection — PV, wind and BESS in all meaningful combinations. The optimal hybrid portfolio achieves 43.5 €/MWh VALCOE with ancillary services — roughly 33% below the best no-storage portfolio.
400 MWh BESS cuts curtailment from 12% to 2% and lifts market capture rate to 133%.
Team Edda
Grünstromspeicher im Realitätscheck
Green storage assets are subject to specific regulatory constraints. In this whitepaper, Team Edda compared real asset data against forecast models — showing which assumptions hold in practice, where deviations occur, and what that means for project developers and financiers.
The practical analysis confirms: EEG-compliant storage assets achieve significantly higher revenues with co-optimisation across DA, ID and ancillary services than assumed in conservative models.
Model your own projects
Apply the methodology directly to your projects — with personalized scenarios, site parameters, and auditable results.