SMB International quotes 0.02 kWh per storage or retrieval cycle for its Truck Shuttle pallet AS/RS, holding even under 24-hour operation and deep-freeze conditions [S1]. That figure is the working baseline most integrators use when sizing battery-backed buffer zones or comparing electric load against a pallet stacker fleet.
The number is per cycle, not per pallet-hour at rest, so it scales with throughput: a crane doing 30 cycles/h pulls roughly 0.6 kWh/h, while a deep-lane shuttle block doing 80 cycles/h pulls about 1.6 kWh/h, before auxiliaries. Dematic's 2026 market research, drawn from 116 global respondents, makes the caveat explicit: 75% flag integration complexity as an adoption barrier, and 41% rank it top two, so energy-per-cycle only tells you the storage-and-retrieval slice, not the total warehouse electrical load [S2].
Where 0.02 kWh Per Cycle Comes From
SMB's Truck Shuttle architecture splits work across a vertical lift and rail-bound channel vehicles, so each pallet sees one short lift event plus a horizontal transfer rather than a full crane traverse. Published cycle energy of 0.02 kWh reflects that partitioned work envelope, with the vendor noting efficiency holds in deep-freeze ambient, which is meaningful because standard induction motors lose 10-20% of efficiency at -25°C without cold-rated lubricants and insulation [S1].
A conventional double-mast stacker crane serving the same aisle typically lands in the 0.04-0.08 kWh per cycle range when the lift height exceeds 20 m, because the hoist and the trolley axes both run per cycle and the hoist motor is the dominant load. Shuttle systems escape that hoist penalty by hoisting once at the lift and then running lighter horizontal drives, which is the mechanism behind the lower per-cycle figure. The same logic explains why a manual pallet jack has effectively zero electrical draw per move, but caps at roughly 200 cycles per operator-hour.
Crane-Based vs Shuttle-Based: Same Energy Range, Different Cost Drivers
For a single aisle, a crane-based unit-load AS/RS and a shuttle-based unit-load AS/RS often quote overlapping energy-per-cycle windows, with shuttle systems at the lower edge and cranes at the higher edge once lift height crosses 15-20 m. Where they diverge is throughput density per metre of aisle, which is where coordination logic adds cost beyond raw kWh, even when per-cycle energy remains in the same band [S3].
Dematic's integration analysis frames the trade directly: shuttle-based AS/RS offers high density and fast internal movement, but if upstream conveyors or replenishment queues stall, energy per delivered pallet rises because the system idles with motors pre-biased. The same applies to crane-based systems, where software priority conflicts can leave cranes cycling empty [S2]. Because picking labor is a major share of total warehouse operating cost, the energy math has to be paired with labor displacement to compare total cost per pallet served [S3].
Deep-Lane Shuttle Economics and Pallet Density
Pallet-shuttle deep-lane storage typically holds 20-30 pallets per row or location, which compresses building footprint and cuts the share of total kWh that goes to building HVAC and lighting per pallet stored [S3]. At those densities, an electric pallet truck doing the last-meter handoff to the shuttle can be sized for shorter travel, which keeps its own battery draw out of the AS/RS energy metric.
Deep-lane density is also where the pallet rack structure starts to dominate capex, and shuttle systems avoid the heavier racking required for crane-only aisles because shuttle loads are distributed across more contact points. The result is that the 0.02 kWh figure is realistic only when the aisle length, lift height, and shuttle count are matched to the throughput target; a shuttle under-loaded by half a typical duty cycle will still draw close to its standby auxiliary load per pallet.
Integration Overhead Is the Hidden Energy Line
According to 2026 Dematic market research that surveyed 116 respondents around the globe, 58% of respondents indicated that poor integration between different systems was their number one challenge with current technology [S2]. The integration cost shows up as kWh, even though it is measured in seconds of conveyor mismatch and WCS exception handling.
Michael Segaar, systems integration expert at Dematic, summarised the discipline: "There are assumptions that define the theoretical model, which is used to simulate performance and establish a performance threshold. That threshold is then compared to the actual system performance. There's going to be differences between that model and the actual output. So the maintenance approach should be proactive enough to minimise those differences and keep the system operating as closely as possible to the model's projected performance."
How to Use 0.02 kWh Per Cycle in Sizing
For crane-based systems above 20 m lift, a 0.05-0.08 kWh per cycle assumption is more defensible than the shuttle figure, and operators should ask for vendor-measured kWh at the actual lift height and load, not generic catalog data. Comparing options by kWh per delivered pallet, not kWh per cycle, captures the throughput loss from integration friction, which is the dimension 75% of surveyed operators flagged as a barrier in 2026 [S2].
Adjacent Technologies and What They Do Not Save
Adding AGV or AMR fleets to feed the AS/RS does not reduce per-cycle energy at the storage machine; it shifts the receiving-end energy budget, since AMRs handling more than 2,500 lb as pallet movers add their own battery draw per delivered pallet [S3]. Plastic versus wooden pallet choice has marginal direct effect on AS/RS energy, but a 25 kg vs 18 kg pallet does change hoist motor load and can shift cycle kWh by low single-digit percent over a full shift.
In practice, 0.02 kWh per cycle is a defensible floor for shuttle-based ambient pallet AS/RS, but the total electrical load per pallet delivered depends on integration quality, ambient temperature, lift height, and throughput utilisation far more than on the storage machine's own nameplate efficiency. The next signal worth tracking is whether 2026-vintage vendors start publishing kWh per delivered pallet rather than per cycle, which would force integration overhead into the same number.
Trackable next signals: published 2026 vendor kWh-per-delivered-pallet figures that include integration overhead, and any IEC or ISO working group output on AS/RS energy benchmarking methodology, which would standardise the 0.02 kWh baseline.