Case Study: Long-Term Asset Solar Community achieves economic validation and optimized BESS designs with Stem’s Feasibility & Preliminary Design service

Ensuring economic viability in the early-development stage with Stem’s Feasibility & Preliminary Design Service

The Long-Term Asset Solar Community, a community-solar owner in Oregon, engaged Stem to evaluate adding battery storage to its existing projects across the Pacific Northwest. Facing seasonal optimization challenges, existing solar curtailment at the site, concerns about BESS operational degradation over its lifecycle, and the need to economically optimize capital and operating costs, they sought Stem’s Feasibility & Preliminary Design service to validate designs and support an economic evaluation.

Stem delivered a two-phase, consultative Feasibility & Preliminary Design engagement (2024), meeting weekly to provide multiple BESS sizing options, OEM hardware configurations, degradation and lifespan guidance, and indicative capex/opex estimates tailored to a 240 MW PV system. The work produced detailed sizing, layouts, production estimates, and revenue results that allow the Long-Term Asset Solar Community to compare scenarios (highest revenue, lowest entry cost, conservative degradation, seasonal optimization) and quantify ROI and revenue impacts; Stem also remains available to support interconnection, deployment, and asset operation stages.