Clear answer, explained.
The right sequence is not solar first or storage first by default — it is determined by modelling both options separately and together. Solar payback, storage payback, demand charge exposure, provincial rate structure, available incentive programs, roof space, electrical capacity, GHG reduction goals, backup and resiliency requirements, and future electrification plans all affect which investment should come first and whether a combined system creates the strongest long-term value.
In many provinces, commercial solar currently delivers the more attractive standalone return because electricity rate savings compound over 25+ years, the Clean Technology ITC provides an immediate 30% capital reduction, and generation assets hold value over the full project life. Battery storage becomes the stronger first investment where demand charges are a significant portion of the electricity bill, IESO demand response or capacity program revenue is available, the site lacks sufficient roof area for a meaningful solar system, or backup power continuity is an operational requirement.
For most facilities, the best approach is not choosing solar or storage in isolation — it is modelling both options separately and together to determine which investment should come first, and whether a combined system creates the strongest long-term value. The combined assessment is part of every project scoping conversation.
What this means in practice.
- The right sequence depends on economics, site constraints, province, and organisational goals — not a fixed rule
- Solar is typically the more attractive first investment where roof area is available and electricity rate savings compound over time
- Storage is the better first step where demand charges are high, grid programs are available, or roof area is limited
- Backup power and resiliency requirements can make storage the priority independent of financial return alone
- Future electrification plans — EV charging, process electrification — may change the optimal storage and solar sizing
- Modelling both options separately and together is the only reliable way to determine the right sequence
Best-fit environments.
- You are deciding whether to prioritise solar or battery storage in your energy capital plan
- Your facility has high demand charges and you want to understand whether storage should come before solar
- You have limited roof space and want to understand how that affects the solar-versus-storage decision
- You have backup power or resiliency requirements alongside energy cost reduction goals
