Much of the information produced in hospitals is clinical and stored for the purposes of documentation. In practice, most of it is never used. The potential of analytics is to reuse this information for other purposes. This is easier said than done, because of technical, semantic, legal and organizational hindrances. In particular, hospitals are not organized to leverage the value of big data. In this study we ask, what does it take to establish an analytics capability in a large hospital? Our empirical evidence is a longitudinal study in a high-tech hospital in Norway, where we followed the development an analytics capability, and assessed the organisational benefits. We offer two findings. First, the analytics capability is much more than the technology; it is the network of analytics technology, an analytics team and the medical and administrative decision makers. Second, we identify institutionalization, both organizationally and temporally, of the analytics process as the key success factor.