Special report - Electricity Storage part 1/5: Belief about the need for electricity storage is no substitute for hard evidence. Countries furthest ahead with transitioning to renewable energy are doing so without incurring the cost of storage. As a foundation for decision making, belief is a dangerous quicksand. Investors beware.
Special report - Electricity Storage part 3/5: By relieving grid bottlenecks of surplus supply and providing bursts of power when needed, storage can add sufficient value to find routes to profitability, but they are limited
Special report - Electricity Storage part 4/5: No means of affordably storing large volumes of electricity in all geographies exists, but a robust grid, connected over a wide area, can deliver green energy reliability
Special report - Electricity Storage part 5/5: The uptake of renewable energy does not increase the need for storage capacity, but stored power can help grid operators flexibly operate power systems, provided it can pay its way
Theme on Energy Efficiency part 4/5: Companies are not investing enough in energy efficiency in order to reap its benefits. This is the economic oddity of energy efficiency, says Brian Motherway, head of energy efficiency at International Energy Agency