Solar energy
Solar energy can provide both electricity and heat. It's unlikely to supply all the energy a business needs but can provide a significant percentage.
Photovoltaic (PV) panels convert sunlight into electricity. They are available in a variety of formats including cladding, roof tiles and custom glazing. The panels are generally positioned on an unshaded, pitched roof. This allows them to receive as much sunlight as possible.
Solar hot water systems absorb energy from the sun and transfer it, using heat exchangers, to heat water. Solar water heating can heat water to temperatures of up to 65°C. There are a variety of solar water heating collectors available, which are commonly mounted on roofs in the same way as PV panels.
Advantages of solar energy
- Solar water heating can be a very economical system for businesses that need large quantities of hot water, such as canteens
- Many people find solar panels a relatively attractive addition to a building. They also make it clear you run a sustainable business
- Planning permission is not always required, although you should always check with your local area planning office
- Solar panels require little maintenance
- Falling equipment costs and higher electricity prices mean that many commercial solar photovoltaic installations now achieve shorter payback periods than historically experienced, although performance will depend on site conditions, energy consumption patterns and installation costs
Disadvantages of solar energy
Solar energy is an intermittent technology as it is dependent on sunlight. Panels can generate some energy when conditions are cloudy but not at night.
Further information
Carbon Trust: Renewable energy technology guides (requires registration)
Microgeneration Certification Scheme: Accredited installers and renewable energy products