Sustainability: On-site renewables | Features

Renewable technology	Candidate buildings	Prerequisites	Potential barriers	Annual saving per 拢100,000 of capital cost
听	听	听	听	kWh	kg CO2
Tower-mounted mwind generators	Industrial, distribution centres	Average site wind speed minimum 7 m/s	Environmental impact. Site space for large turbines	100,000	43,000*
好色先生TV-mounted 鈥渕icro wind鈥�	Most types of building	Average site wind speed minimum 3.5 m/s	Environmental impact. Roof space for small turbines.	40,000	17,200*
Photovoltaic roof or panels	Most types of building	Roughly south-facing, unshaded	Available roof space	12,500	5,375*
Photovoltaic rain screen or glass	Prestige offices or retail	Roughly south-facing, unshaded	None	9,000	3,870*
Passive solar water heating	Residential and commercial, hotels and leisure	Roughly south-facing, unshaded. Requirement for hot water	None	50,000	9,500鈥�
Ground-source heat pump	Most types of building	Feasible ground conditions	Site space for pipes	40,000	7,600鈥�
Borehole cooling	Offices, hotel, leisure	Feasible ground conditions	Site space for pipes	12,000	5,160*
Biomass boilers	Most types of building	Space and convenient source of fuel. Requirement for heat in summer	Environmental impact and maintenance	100,000	19,000鈥�
Biomass CHP	Industrial, hotel, leisure, hospital	Space and convenient source of fuel. Requirement for heat in summer	Environmental impact and maintenance	(P) 28,000 (H) 63,000	(P) 12,000* (H) 12,000鈥�
	听	听	听	听	听
* compared with electricity; 鈥� compared with gas

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