The global energy market is in turmoil. Volatility in oil prices, mounting energy security fears and the looming catastrophe of climate change show that our current energy system poses grave threats to our way of life, at the same time as making it possible.
Against this backdrop, the seemingly simple idea of storing energy—preserving it in stasis until it is needed—is potentially revolutionary.
The McKinsey Global Institute (MGI) identifies energy storage as one of the world’s top 12 disruptive technologies. The consultancy estimates the potential global economic impact of improved energy storage could be as much as US$635 billion a year by 2025.
The most widely used energy storage technology is pumped hydroelectric storage (PHS), whereby water is pumped to a high elevation at times of surplus and released through turbine generators during peaks of demand. PHS accounts for 99% of the world’s large-scale energy storage capacity, according to the International Energy Association.
Increasingly, though, chargeable batteries are being used for residential and mobile energy storage. They are already used in hybrid and electric cars. In April 2015, electric car maker Tesla unveiled a new range of batteries for the home, providing a shot of publicity for the small but fast growing home energy storage sector.
On both a residential and industrial basis, energy storage has the potential to change consumption patterns in several key ways.
Energy providers, for example, can generate power during times of low demand and hold it in reserve for when it is need. This allows them to manage power more efficiently by reducing the need to generate enough power for peaks in demand. Peak-load shifting also has the potential to reduce transmission losses, lowering costs further.
Energy storage can also improve the viability of wind or solar energy, which can be intermittent due to fluctuating weather conditions. This not only improves the economic case for decarbonisation; it also improves the prospects for off-grid distributed energy systems, potentially undermining traditional utilities.
By making power sources for industrial and residential customers more reliable, energy storage can also contribute to stronger economic growth in the developing world. Around 17% of the world’s population do not have access to electricity, according to the UK Department for International Development. The anti-poverty group One estimates that lack of access to electricity in sub-Saharan Africa can limit GDP by 2% to 5% a year. And with around half of businesses in developing countries lacking reliable power supplies, battery-powered storage could have an annual economic impact of as much as US$100 billion by 2025, according to MGI.
Energy storage has the potential to transform the global economy by making power load management more efficient, by providing a reliable energy supply, by boosting economic growth in the developing world, and by helping to level the playing field for renewable energy sources and distributed power.
Managing the ramifications of this process is likely to keep businesses and policymakers on their toes in the near future.
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