LOW-TECH MAGAZINE

We Can't Do It Ourselves

How to live a more sustainable life? This question generates a lot of debate that is focused on what individuals can do in order to address problems like climate change. For example, people are encouraged to shop locally, to buy organic food, to install home insulation, or to cycle more often.

But how effective is individual action when it is systemic social change that is needed? Individuals do make choices, but these are facilitated and constrained by the society in which they live. Therefore, it may be more useful to question the system that requires many of us to travel and consume energy as we do.

Ditch the Batteries: Off-Grid Compressed Air Energy Storage

Going off-grid? Think twice before you invest in a battery system. Compressed air energy storage is the sustainable and resilient alternative to batteries, with much longer life expectancy, lower life cycle costs, technical simplicity, and low maintenance. Designing a compressed air energy storage system that combines high efficiency with small storage size is not self-explanatory, but a growing number of researchers show that it can be done.

History and Future of the Compressed Air Economy

Compressed air energy storage (CAES) is considered to be an important component of a renewable power grid, because it could store surplus power from wind turbines and solar panels on a large scale. However, in its present form, the technology suffers from large energy losses and depends on natural gas to operate.

A look at the 4,000 year long history of compressed air makes clear that this is not unavoidable. Although our ancestors were dependent on less energy efficient technology, they used compressed air in more intelligent configurations that had fewer energy conversion losses and were independent of fossil fuels.

These historical systems hold the key to the design of a low-tech, low-cost, robust, sustainable and relatively energy efficient energy storage medium. The compressed air economy could be the practical and realistic alternative to the hydrogen or all-electric utopias.

How Much Energy Do We Need?

Because energy fuels both human development and environmental damage, policies that encourage energy demand reduction can run counter to policies for alleviating poverty, and the other way around. Achieving both objectives can only happen if energy use is spread more equally across societies.

However, while it’s widely acknowledged that part of the global population is living in ‘energy poverty’, there’s little attention given to the opposite condition, namely ‘energy excess’ or ‘energy decadence’. Researchers have calculated minimum levels of energy use needed to live a decent life, but what about maximum levels?

Bedazzled by Energy Efficiency

To focus on energy efficiency is to make present ways of life non-negotiable. However, transforming present ways of life is key to mitigating climate change and decreasing our dependence on fossil fuels.

How to Run the Economy on the Weather

Before the Industrial Revolution, people adjusted their energy demand to a variable energy supply. Our global trade and transport system -- which relied on sail boats -- operated only when the wind blew, as did the mills that supplied our food and powered many manufacturing processes. 

The same approach could be very useful today, especially when improved by modern technology. In particular, factories and cargo transportation -- such as ships and even trains -- could be operated only when renewable energy is available. Adjusting energy demand to supply would make switching to renewable energy much more realistic than it is today.