I understand that such a capacity metric might be useful for generation, and somewhat useful for storage. One could see the grid operators having a good grip on

I understand that such a capacity metric might be useful for generation, and somewhat useful for storage. One could see the grid operators having a good grip on the utility of storage to smooth off tv pickup and evening peaks, in full knowledge that the energy stored will run out in a few hours. However the linked article is on theprogressplaybook.com; the about page has the following blurb The Progress Playbook™ focuses on proven ideas for a better world. We cover the policies and projects that are succeeding in driving sustainable development, and that could be replicated elsewhere. This publication is intended to be a resource for policymakers, business leaders, civil society organisations, and ordinary citizens. It is clear that the publication is not aimed specifically at grid insiders, so propagating the grid's argot to a more general audience is at the very least unhelpful.