In May, we published our first installment of Cloud Possible: Mission Critical for Utilities, we explored Public and Private cloud, the 2 primary cloud deployment models and the considerations for mission critical applications for Utilities. In this installment, we’ve decided to break it up into shorter more frequent posts, but we’ll introduce three Cloud Service Models: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). In future installments we will evaluate each of these models. Much like in our first installment, we’re reviewing some content that’s been around for a while now – but we’re addressing this in the context of mission critical enterprise applications. As always we are looking at it specifically for utilities, where for valid reasons, cloud adoption may be less common than in other industries. As we begin this installment, it’s important to note that evaluation of these models will require an understanding and desire for simplification, efficiency and economies of using multi-tenant cloud provider services, balanced against the requirements to maintain the control, flexibility, and ability to customize in order to deliver productive and compliant applications to stakeholders.