Energy systems are changing. Previously well-segregated markets are starting to overlap, and unexpected business models emerging. Energy storage is an essential component of these evolving systems. We can assess the system impacts of emerging sustainable energy technologies and evaluate novel energy storage. We work across the spectrum of potential applications and storage technologies, from grid support to electric vehicles, from large scale to portable devices, and from flywheels to hydrogen. Leading car manufacturers, oil majors and investors have come to us for technology evaluation, due diligence support, strategy development, and policy advice.