ICE - Institution of Civil Engineers - Virtual Library

The predictable, regular reversal of the tides makes this an important renewable energy resource, one which is large, technically well proven and reliable if exploited by applying the conventional principles of hydroelectric power. The basic operating principles of tidal power stations were explored in depth in many studies carried out throughout the twentieth century. With few exceptions, a basic premise was to maximise energy output. Less attention was given to identifying the design and operating procedures needed to maximise aggregated energy value, it presumably being assumed that the latter followed the former. The studies reported in this paper are based on the now strongly established commercial trend for electricity to be marketed competitively, having regard for such factors as time of day and guarantee of use. Consumer technologies have taken advantage of the differential tariff structures which have emerged and will continue to evolve, and this in turn is being reflected in the composition of the supply industry. The much-valued versatility of hydro generation applies equally to tidal power plant. The opportunities for a tidal barrage to be operated flexibly, having regard for fundamental resource constraints, are set out, though without regard for tariff structures because these will depend on the particular network conditions in which any project will operate. The studies have been carried out in the context of a Severn Estuary barrage.