United Kingdom is the windiest country in Europe, so much so that we could power our country several times over. 
PassivHaus case study:- Powys Council, Stag Teaching facility
Powys council decided to become the first client in the UK to go for a non residential Passivhaus, as it spends a significant sum on energy bills, which were due to rise by approximately 40% within the region. This made the possibility of achieving an 85% reduction in space heating attractive, and became the principle motivational driver for implementing the project.
The project was intended to not only comply with Passivhaus, but in addition as a pre requisite for Welsh Assembly funding, were required to achieve a BREEAM excellent rating, which does not necessarily correspond together. This resulted in the building being designed to maximise natural light, through lots of south facing glazing.
During final design stages, it was confirmed, as part of an established framework, Dell computers had to be used, and not the low energy models, with a new server room, causing energy demands to soar; as a result energy savings had to be found. The first change was to add Brises-Soleil to the front of the building. Another was equally simple, using mechanical timers to switch off everything at night. Detectors were then added in each of the computer rooms, allowing lighting and ventilation to be independently controlled, and turned off when the room was not in use.
The sheer number of computers also meant, significant waste heat was being produced, which had to be removed, particularly during hot summer days. The whole house mechanical system enabled this through a process of night cooling, allowing the heat to be purged from the building. Heat exchangers were also fitted to enable them to be removed, facilitating fresh air to flow into the building without being heated by the exhaust air.
In addition to the smart measures to reduce the U value, the building was also fitted with a 7kW array of solar panels which generate 5,987Kwh/yr. These were partially grant funded, on the pre condition that the feed in tariff be used to fund the initial capital outlay.
Upon completion, the building was monitored for a year, data taken from which identified electricity and heating demand to be less than expected, below the recommended Passivhaus standard. Energy bills were relatively low, despite the presence of a 24KW boiler installed despite a heating load of merely 4.8KW.
This Passivhaus project has been successful in delivering a sustainable building, using a combination of high thermal retention, mechanical ventilation systems and smart monitoring technology.
From a financial and environmental point of view, the project has been a success for the local authority. Powys Council are so pleased with the significant savings in maintenance and running costs, that they are aiming to use the system to build a community campus, depending if funding from the Welsh assembly becomes available.