Battery Energy Storage Systems (BESS)

Battery Energy Storage Systems (BESS) are increasingly being evaluated by property, energy, and operations teams to manage peak electrical demand, improve resilience, and support long‑term electrification and climate objectives.

For many organizations, the next question isn’t what battery storage is, it’s whether it makes sense for their specific buildings, loads, and operating constraints. That’s where clear, facility‑specific feasibility becomes critical.

Why organizations are looking at battery storage now

For many organizations, battery storage enters the conversation when electrical constraints like rising demand charges, limited service capacity, electrification plans, or concerns about reliability during peak grid events start to matter more.

Battery storage is most often explored to help:

• Manage and limit peak electrical demand
• Participate in BC Hydro demand response programs
• Provide backup power for critical operations
• Support EV charging and electrification without immediate service upgrades
• Improve the effectiveness of on‑site solar PV
• Demonstrate progress toward climate and resilience goals

Battery storage is rarely pursued as a short‑term cost‑saving measure. As with early solar PV projects, decisions are usually driven by risk management, long‑term planning, and sustainability commitments rather than quick financial returns.

Major Components of a Battery Energy Storage System

How battery storage is used in real buildings

In commercial, institutional, and industrial facilities, battery storage is typically integrated with existing electrical infrastructure, building controls, and on‑site solar PV where applicable.

In practice:

• Batteries are charged during off‑peak periods or when solar generation is available
• Stored energy is discharged during peak demand periods or utility grid events
• A load controller or energy management system coordinates power flows between the grid, solar PV, battery storage, and building loads

The value of a BESS depends less on the battery itself and more on how well it is matched to a facility’s demand profile, operating patterns, and control strategy.

Is battery storage a good fit for your facility?

The effectiveness of battery storage varies significantly by site, sector, and operating conditions.

Key questions organizations typically need answered include:

• When do our peak demand events occur, how severe are they, and how long do they last?
• How much load flexibility do we have?
• Which loads are critical during outages or grid events?
• Could battery storage defer or reduce electrical infrastructure upgrades?
• How do BC Hydro incentives and program requirements affect feasibility?

A feasibility‑first approach helps ensure battery storage is evaluated realistically, identifying where it adds value and where it does not.

BC Hydro Energy Storage System Incentive (ESI)

BC Hydro’s Energy Storage System Incentive (ESI) program is a key driver for battery storage adoption in BC. The program is designed to support systems that can respond to grid constraints and participate in demand response events.

Through the ESI program:

• A significant portion of eligible battery system costs may be funded
• Participants commit to allocating stored energy to be available during grid peak events
• BC Hydro controls the nominated battery capacity during four‑hour grid peak events. Outside of those events, the owner is free to use the battery to support on-site operations

Program eligibility, system sizing, and operational requirements are specific and must be addressed early. Battery systems need to be designed not only around facility needs, but also to meet BC Hydro’s technical and operational criteria.

How Prism supports battery storage decisions

Prism Engineering supports organizations by providing independent, technically grounded guidance on battery energy storage systems. We do not sell batteries or represent equipment vendors. Our role is to help clients understand whether battery storage is appropriate for their facilities, and how to move forward responsibly if it is.

Our battery storage services include:

• Early‑stage opportunity assessments
• BC Hydro‑funded feasibility studies
• Demand profile analysis and battery sizing
• Integration with solar PV, EV charging, and building controls
• Support navigating BC Hydro ESI requirements
• Electrical design and implementation support

Relevant experience

Prism has been involved in battery energy storage assessments in British Columbia since 2018, supporting clients across institutional, commercial, and industrial sectors. Our experience includes:

• Completion of BESS feasibility studies across a broad range of facility types
• Evaluation of battery storage as part of solar PV and load management projects
• Close collaboration with BC Hydro on training, incentives, and feasibility tools
• Projects progressing from feasibility into implementation and construction, under the ESI program

This experience allows us to provide practical, realistic guidance aligned with how battery storage is actually being applied in BC today.

Considering battery storage for your facility?

Connect with Prism’s electrical and energy specialists to explore a battery storage opportunity assessment or feasibility study.