Question 1

Why do data centres need battery energy storage beyond UPS backup?

Accepted Answer

Because storage does four jobs a UPS cannot. It firms behind-the-meter generation so on-site power rides through a trip, shaves peaks against demand charges, provides seconds-scale response to utility dispatch signals, and lets a campus flex its load rather than draw flat. In British Columbia that last capability is what turns an AI data centre from a grid burden into a grid asset.

Question 2

What is the difference between lithium-ion and vanadium flow batteries?

Accepted Answer

Lithium-ion delivers high power in a small footprint, making it right for ride-through and fast grid services measured in seconds to minutes. Vanadium redox flow batteries decouple power from energy, so they add long-duration capacity — four to twelve hours — with effectively no cycle degradation, suiting daily charge-discharge against a data centre's load curve. Most vendors sell one; a developer designing the whole campus uses each where it wins.

Question 3

How large is a grid-scale BESS for an AI data centre?

Accepted Answer

Sizing follows the job rather than the building. Ride-through and power-quality duty typically needs 15–30 minutes at full campus load; peak shaving and demand-response duty needs two to four hours; firming intermittent on-site generation can need longer. GRECO models state of charge, dispatch response and thermal behaviour in the campus digital twin before any container is ordered.

Question 4

Can a data centre earn revenue from its battery storage?

Accepted Answer

Yes, through three stacked streams. Demand charge reduction cuts the utility bill directly. Grid services — frequency regulation, capacity and demand response — are paid by the utility or system operator. And arbitrage between on-peak and off-peak energy prices adds a third. Because these use the same asset at different times, a well-dispatched BESS earns from all three.

Question 5

Does battery storage help with BC Hydro power allocation?

Accepted Answer

It helps materially. BC Hydro is allocating limited capacity competitively, and a load that can shed on command is far easier to accommodate than one that cannot. Storage plus dispatchable compute lets a campus commit to reducing draw during system peaks, which strengthens an allocation case and can reduce the firm capacity the project needs to request in the first place.

Question 6

What is a battery energy storage system (BESS)?

Accepted Answer

A BESS is a grid-connected assembly of battery cells, power conversion equipment and controls that stores electrical energy and returns it on demand. At utility scale it arrives as containerised blocks: battery racks, an inverter or power conversion system, thermal management, fire detection and suppression, and an energy management system that decides when to charge and discharge. The battery itself is often the least interesting part — the controls and the power electronics are what determine whether it earns its keep.

Question 7

How does a battery energy storage system work in a data center?

Accepted Answer

Differently from a UPS, which exists only to bridge the seconds before a generator starts. A grid-scale BESS in a data centre campus does four jobs at once: it firms behind-the-meter generation so output stays flat while a plant ramps, it rides through grid disturbances, it discharges during expensive peak windows to cut demand charges, and it responds to utility dispatch signals by shedding or absorbing load within seconds. The energy management system arbitrates between those jobs continuously, because they occasionally want opposite things.

Question 8

Are battery energy storage systems safe?

Accepted Answer

Lithium-ion carries a genuine thermal-runaway risk, which is why NFPA 855 governs spacing, deflagration venting, gas detection and fire-service access. Two choices reduce it substantially: LFP chemistry is far more thermally stable than the NMC cells used in electric vehicles and is now near-universal in utility-scale systems, and vanadium flow batteries use an aqueous electrolyte that cannot burn at all. We would rather state the risk plainly than have a permitting hearing discover it for us.

Question 9

Is sodium-ion ready for data-centre storage yet?

Accepted Answer

Not yet, and we would be cautious of anyone saying otherwise. Sodium-ion is genuinely promising — cheaper materials, no lithium or cobalt supply exposure, and notably better cold-weather performance, which matters in Canada. But deployments are pilots rather than fleets, and the bankability and warranty terms a project financier needs are not there. We track it and expect to deploy it eventually; we do not specify it into projects today.

Question 10

How much does a battery energy storage system cost?

Accepted Answer

Any single number quoted without a load curve is marketing. Cost is driven by power rating in MW, duration in hours, chemistry, site works, interconnection and fire-code compliance — and the last two surprise people most often. The more useful framing is what the system earns: demand-charge reduction, avoided firm capacity in an allocation request, grid-service revenue, and the generation capacity you do not have to build because storage covers the peak. We size against that, not against a price per kilowatt-hour.

	Lithium-ion (LFP)	Vanadium redox flow	Sodium-ion
Best at	High power, fast response	Long duration, daily cycling	Cost and cold weather
Typical duration	1–4 hours	4–12 hours	2–4 hours
Cycle degradation	Degrades with cycling; needs augmentation	Effectively none — electrolyte does not wear out	Good, still being proven at scale
Energy density	High — compact footprint	Low — needs roughly 3–5× the space	Lower than lithium
Thermal runaway risk	Real, and the reason NFPA 855 exists	None — aqueous electrolyte will not burn	Lower than lithium
Maturity for data centres	Proven and bankable today	Proven, fewer deployments	Early — pilots, not fleets
Where GRECO uses it	Ride-through and fast grid services	Daily load-curve cycling and heat-linked duty	Watching, not yet deploying

Batterilager för datacenter

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