I was looking at the Watsonville campus and kept doing the math and the number kept coming out
the same. Sketch below. Hover the toggle — same building, same dock, same
crews; just the thing inside the mechanical room changes. And the four numbers
around the diagram.
AS IS
existing NH₃ central plant
TO BE
ReChill distributed CO₂ fleet
What's there now
Single-stage NH₃ rack across 3 buildings. Hot-gas bypass for capacity control. Continuous-duty screw compressors at ~73% of plant load. PSM-threshold facility, RETA-certified operators, RMP filing.
What ReChill would put there
10 × C40 (distributed, one per zone) + 1 × Plaid skid (IQF + blast). CO₂ transcritical, variable-speed throughout, pack hot-swap, zero NH₃ on site. Existing pads + dock layout retained.
Installed Load
~800 TR1,396 TR
single-stage NH₃variable, scaled
kW / TR
2.51.5
field rulepart-load matched
Annual Electricity
$2.45M$1.15M
@ $0.14/kWh40% off-peak
PSM Exposure
10,000+ lbZERO
NH₃ above thresholdCO₂ unregulated
The thing that made me sit down and run this
The same thing that makes a Tesla go 0-60 in 2 seconds — high-power-density
variable-speed electric drive, automotive-grade battery, precision motor control — makes
your plant save millions and never touch ammonia again.
Same drivetrain. Different package. Sitting at auction for $7K a copy.
Somebody walks the rack and writes down actual installed kW and product mix
D 30
Pad prep done · the existing freezer-room pads get reused, just conduit pulls
D 60
First 4 × C40 land · they run in parallel with the existing NH₃ rack
D 90
Plaid skid lands at the blast tunnel · the IQF transitions over to CO₂
D 110
Remaining 6 × C40 land · NH₃ rack decommissioned one room at a time
D 120
Campus on ReChill. NH₃ off and sold for scrap. Packs auctioned. Nobody loses a shift.
Why nobody's noticed yet
Every refrigeration engineer in the valley grew up sizing
bigger NH₃ racks. That's the only tool in the bag. So when the customer
says "what do we do at 800 TR" the answer is always "a bigger rack" — six-month rebuild,
$18-24M, same compressor brands, another decade of PSM filings.
Meanwhile there are Tesla packs at Manheim for $7K each, three hours
from the Watsonville dock. 75 kWh of automotive-grade infrastructure per pack,
engineered for 200,000-mile duty cycles, used at maybe 10-15% of that in stationary
service. The hardware to wrap one in a container with a Bitzer CO₂ head is
commodity. It just hasn't occurred to anyone yet.
The line I keep saying out loud when I run the numbers
The same drivetrain that takes a 4,500-lb sedan from
0 to 60 in two seconds — the 75 kW continuous IPMSynRM motor, the
400 V battery, the variable-speed inverter — is sitting at salvage auction. Put it in a
container with a CO₂ head and it runs your blast tunnel at part load without
hot-gas bypass and without 10,000 pounds of anhydrous ammonia on the floor.
That's it. That's the whole thing. The engineering's been done; somebody just has to
put it together.
Be brutal with my numbers — it's still wild
Cut my load estimate in half, savings drop to $650K/yr · cut my $/kWh to $0.10, $850K/yr · cut
the off-peak shift to zero, $750K/yr · push install to 18 months, NPV still pencils.
The exact number doesn't matter. The thing I keep getting stuck on is that
nobody is even sketching this — there's a Tesla pack three hours from Watsonville and a
refrigeration consultant in town who could spec the conversion in an afternoon if they thought
to.