Sensitive and sympathetic system design lessened the impact of the modern energy equipment on the fabric of the building. All changes to the buildings had to be approved by National Trust committees in addition to obtaining the necessary planning permissions for this grade 1 listed building. Information is presented both to the site warden and to visitors to the site about the power being generated from the various sources and consumption around the site. In addition, a “fuel gauge” provides continuous feedback about the amount of energy availability from the battery bank. This detailed feedback enables the site warden to manage the various energy demands in response to the available hydro and solar energy and the visitor schedule for the days ahead.