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Jobs
Large-scale hydroelectric schemes are usually built in remote areas away from centres of population. They can be a valuable source of employment to the area during construction and operation.
Recreation
The creation of a reservoir can offer recreational possibilities and can attract tourists.
Intrusion
Small-scale hydroelectric schemes in particular are quiet and visually unobtrusive. Large-scale hydroelectric projects cause an increase in traffic during the construction phase which can be long and very noisy.
Visual impact
The dams and eroded shorelines of reservoirs can have a negative visual impact, although schemes can also add positively to the visual environment.
Cost
For houses with no mains connection, but with access to a micro-hydro site, a good hydroelectric system can generate a steady, reliable electricity supply at a lower cost than other renewable technologies. Though still quite high, total system costs are often less than the cost of a grid connection, with no electricity bills to follow. Micro hydro has proved useful in powering remote domestic loads and as part of development projects in less developed countries.
Public attitudes
Most participants in a DTI survey had heard of hydroelectric power but had little understanding of how it worked. Hydroelectric power was accepted as an established method of supplying energy. No-one had any negative views on this source of energy and some considered hydroelectric schemes as tourist attractions. Some referred to water mills producing energy and the fact that this method of generating power historic roots. Participants were concerned about the social impact of hydroelectric schemes, particularly if such schemes required the flooding of valleys and were opposed to hydroelectric schemes under such circumstances.
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