Remote off-grid communities across northern Canada and Alaska are traditionally powered by diesel generators. Fuel delivery, often via ice roads, can be difficult and expensive. Wind turbines and solar PV arrays can be deployed to offset the need for diesel generation, but they can destabilise the system at anything more than modest penetration levels. Using energy storage can help renewables achieve much higher levels of penetration to maximise fuel savings. This article describes the control strategies for such systems and the challenges of Arctic installations… By Jim McDowall, ESS Business Development Manager, Saft Batteries.