What do we mean by utility-scale?

We define utility-scale solar as projects with a rated output capacity of 4 MWac and above, as noted here.

This threshold applies (unless stated otherwise) in all our publications from 2014 onwards.

The rationale for adopting this threshold is described in the paper on the left.

Pre 2014

Wiki-solar originally adopted a threshold of 10 MWp.

Legislation changes in some markets created a case for redefining the threshold, so we published this paper and sought the views of experts within the industry in a consultation during the second half of 2013.

The impact of change was assessed in this release.

As a result, we revised the threshold at the end of 2013, as described in this paper.

We'd like to hear your views

We have adopted the standard on the left, but will keep this under review and would like your input.

Please give your suggested threshold for "utility-scale" solar, by submitting the simple form below:

Utility-scale solar

The cut-off point is not easy to set. Here's how we have done it, and why

Westcott Solar Park at 1.2MWp would not qualify as 'utility-scale', despite being one of the longest in Europe


The authority on utility-scale solar power