01 THE HOUR
06:15
September 20, 2017, Yabucoa, Puerto Rico
Hurricane Maria made landfall near Yabucoa on Puerto Rico's southeast coast as a Category 4 storm with sustained winds of 155 miles per hour. The PREPA electrical grid collapsed during the crossing. By midday the entire island was dark.
Governor Rossello confirmed that evening that the energy infrastructure was completely down. With the grid went the card terminals, the internet connections, the cell towers. 3.4 million people entered an island-wide blackout carrying whatever cash was already in their hands.
02 THE SEQUENCE
Sept 20 Maria made landfall at 6:15 AM near Yabucoa. The PREPA grid, already weakened by Hurricane Irma two weeks earlier, collapsed during the crossing. By midday every customer on the island was without power.
Sept 21 The FCC reported more than 95 percent of wireless cell sites out of service. Without electricity or cellular connectivity, card terminals at merchants across the island could not process transactions.
Sept 27 At least half of bank branches remained closed, according to the Association of Banks of Puerto Rico. Banco Popular, the island's largest bank, had reopened 57 of 169 branches and 150 of 600 ATMs. The Federal Reserve Bank of New York issued a public statement: demand for cash was extraordinarily high, its own cash operations were working, and it held adequate inventory. The currency was on the island.
Late Sept Treasury Secretary Mnuchin confirmed two giant cash shipments. The executive chairman of Puerto Rico's largest bank had telephoned NY Fed President Dudley in the days after the storm, and a jet loaded with cash was dispatched. The governor reported 86 bank branches open, each limiting daily withdrawals. A credit union nearby was admitting 200 customers per day.
Oct 3 Roughly 40 percent of bank branches had reopened. The Financial Oversight Board reported 180 branches and credit unions in service and 300 ATMs, with some municipalities served by one or two machines. FirstBank had 27 of 48 branches open and approximately 20 percent of its ATM network running.
Oct 18 203 of 314 bank branches were open, with 838 ATMs working. More than a third of banks remained closed a month after the storm. Gas stations recovered faster: the DOE counted 872 of 1,110 operational. Power had been restored to 13.7 percent of customers. The currency supply was not the constraint. The last mile was.

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03 THE HIDDEN DEPENDENCY
The armored car fleet. Puerto Rico had enough physical currency within the first week. The New York Fed confirmed adequate inventory. The Treasury shipped more. The problem was distribution.
Armored car services needed diesel for their trucks, drivers to crew them, and private security guards to load ATMs at off-premise locations such as supermarkets. All three were in short supply. Banks could not get enough armored trucks with fuel, or truck drivers, to deliver cash safely. The armored fleet competed for the same fuel and road access as every other vehicle on the road.
The cash sat in vaults while the machines sat empty.
The problem was distribution.
04 WHAT STILL WORKED
CASH ON HAND
Residents who had withdrawn cash before the storm could transact when every electronic channel failed, while those without banknotes joined hours-long lines at the few working ATMs.
CASH-BASED STREET VENDORS
A pushcart ice cream vendor in San Juan, who had a supplier with a generator, reported making up to $500 on some days in the week after the storm. Cash in, product out, no terminal required.
CREDIT UNIONS DISPENSING BY HAND
At least one credit union removed cash from its own ATMs within two days and began paying members up to $250 by hand, in some cases without formal account verification, before most commercial bank branches had reopened.
05 THE DOCUMENT
THE DOCUMENT
September 27, 2017
"Statement Regarding Cash Operations in Puerto Rico." Federal Reserve Bank of New York. One paragraph. The statement confirmed that the Fed's cash operations on the island were working and that it held adequate inventory to meet demand from depository institutions. It then named, in a single sentence, the three dependencies standing between that inventory and depositors: power restoration at banks, armored car services reaching branches, and ATMs coming back online. Each of those three conditions required the electrical grid the hurricane had destroyed.
06 THE PATTERN LIBRARY
#1
When one retail withdrawal channel closes or fails, demand concentrates on whichever channel is left open, and the capacity of that channel sets what a depositor can obtain.
Observed: Northern Rock 2007, Cyprus 2013, India 2016, Greece 2015, United States 1933, Argentina 2001, Lebanon 2019, Worldpay 2026, TSB 2018, Afghanistan 2021, Nigeria 2023, Square 2023, United States 2025, Fiserv 2025, United States 2021, RBS Group 2012, Soviet Union 1991, Russia 2022, Ecuador 1999, Puerto Rico 2017.
#4
Domestic payment channels can continue while cross-border wire transfer routes fail. Where credit card settlement runs through a separate institution on an independent network, it may persist after the wire transfer channel closes. In some cases the central bank intermediates selected transfers through its own remaining correspondent accounts.
Observed: Iceland 2008, Germany 1931, Belize 2015, Russia 2022.
#9
A payment outage can hit card authorisation and merchant funding as separate faults, so acceptance at the terminal is restored while the money owed to the merchant arrives a day late under its own incident notice.
Observed: Worldpay 2026, United States 2021, Marqeta 2026, Square 2023.
#10
A retailer that loses electricity can go on trading by taking cash and rationing goods by hand, so the counter outlasts the checkout system that normally prices and settles the basket.
Observed: Texas 2021, Puerto Rico 2017.
#39
Physical currency can be held in adequate supply at a central point while remaining inaccessible at branches and ATMs, because the armored car fleet that distributes it requires fuel, road access, and personnel that the same disruption has removed.
Observed: Puerto Rico 2017.
CHANGED TODAY: Entries 1 and 10 gained Puerto Rico 2017. New entry 39 added, on the last-mile cash distribution dependency.