Always connected ... a woman checks her mobile phone across the street from a fallen tree in Queens, New York. Photo: Reuters
Hundreds of thousands of friends, strangers and government officials exchanged links, photos, rumours, warnings and corrections about the progress of Hurricane Sandy on sites such as Instagram, Facebook, Tumblr and Twitter this week.
Amid the updates about flooding, fatalities and fine wine opened to pass the time, there appeared a strange phenomenon: people tweeting to say that their power had gone out. While millions went without power, signal failures were few and far between, relatively speaking. As whole neighbourhoods went dark, mobile phones stayed online, allowing us to exchange internet telegrams while chaos howled outside.
This is new. It's not that long ago that mobile networks went down first, not last. On September 11, 2001, the mobile networks failed almost completely in New York, overwhelmed by traffic and damage. In the wake of that disaster, you couldn't even send an SMS to a loved one on a different mobile network - that capability didn't start to come online in the United States until November 2001.
Plugged in ... a man charges his phone from a home that did not lose power in Hoboken, New Jersey. Photo: AFP
Compare that to the New York City Mayor's Office, which asked people to use SMS whenever possible, in order to alleviate pressure on the phone lines.
This change has been the result of countless refinements to the mobile network infrastructure, made in response both to a string of disasters that have tested the networks and to an explosion in people reliant on mobile phones. In the intervening decade, mobile carriers have been hard at work, building bandwidth and hardening their installations.
Perhaps the most important improvement to have been made was switching the towers from reliance on the electrical grid to batteries, which are in turn recharged from municipal power or on-site generators in the event that the grid goes down. At Quartz, Christopher Mims traces this push for backup power to the collapse of the network in New Orleans after Katrina in 2005.
What's striking about the mobile networks' rise to resilience is how quickly it happened. In 2001 in New York and again in 2005 in New Orleans, mobile providers failed. In 2012, they did pretty well. There's a lesson here.
The infrastructures and batteries that allowed post-power tweeting are a tiny wonder. They're also a good lesson for the future of energy. One common criticism of technologies such as wind and solar power is that they are irregular providers of electricity. This is a problem only because we've created a civilisation of appliances, machines and cultural practices that very much depend on a constant stream of power.
It doesn't have to be this way.
Anyone who uses a laptop or mobile phone is already used to the delicate dance of irregular electricity, sipping power when they can, running down the batteries when they can't. This is generally seen as an improvement over the alternative of always being plugged in. Our increasingly resilient cellular networks, which put a buffer between themselves and an unreliable world, offer another glimpse of how that might work. Fuel delivery services such as oil and gas, which rely on storage tanks — to say nothing of disused coal chutes and bricked-up fireplaces — remind us that irregular access to energy has been the norm for a long, long time.