The measures of economic viability for a storage project are less certain than they are for more traditional technologies, such as a natural gas plant or a solar or wind farm, where project risks are familiar, says testing expert and consultancy DNV-GL. But the company predicted in its recent Energy Transition Outlook report that by 2050, in a world with 80% of electricity generated by renewables, energy storage will provide 50TWh annually for renewables integration and grid management.