Llanberis, Gwynedd - Surge Pond, Elidir Fawr - Hinde postcard

Postcard
• Picture / Image:  Surge Pond, Elidir Fawr, Llanberis, Gwynedd
• Publisher:  John Hinde (2/5112)
• Postally used:  no
• Stamp:  n/a
• Postmark(s): n/a
• Sent to:  n/a
• Notes / condition: 

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Text from the free encyclopedia WIKIPEDIA may appear below to give a little background information (internal links may not  work) :

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Elidir Fawr is a mountain in Snowdonia, north Wales, the northernmost peak in the Glyderau.

To the north of the summit is a small lake, Marchlyn Mawr, which is the upper reservoir for Dinorwig power station, a pump-storage power station hidden inside the mountain. Water from this lake flows through huge tunnels into the lower reservoir Llyn Peris. From the north, Elidir Fawr is very prominent, and can appear to be higher than the higher mountains behind it.

The Dinorwig Power Station (/d?'n?rw?g/; Welsh: [d?'n?rw?g]) is a 1,728 MW pumped-storage hydroelectric scheme, near Dinorwig, Llanberis in Snowdonia national park in Gwynedd, north Wales. It comprises 16 km of tunnels, 1 million tons of concrete, 200,000 tons of cement and 4,500 tons of steel.

The original purpose of the scheme, it is claimed, was to deal with the difficulty that National Grid would have had if the large numbers of nuclear power stations then planned had been built. These are technically and economically inflexible, ideally needing to run at full output all of the time and, effectively, storage capacity was needed for some of the night-time power when the demand for power dropped off. Electric night storage heaters and the Economy 7 tariff fulfill a similar purpose.^[1]

The stalling of the UK nuclear power programme in the late 1980s and the coincident dash for gas increased the proportion of dispatchable plant on the network, making the use of pumped storage for day/night load balancing less attractive. As a result, a similar facility planned for Exmoor was never built.^{[citation needed]}

Today, Dinorwig is operated not as a peaking station i.e. to help meet peak loads, but rather as a STOR - Short Term Operating Reserve, or Fast Response plant actor, acting in response to short term rapid changes in power demand or sudden loss of power stations. In a common scenario (known as TV pickup), the end of a popular national television programme or advertising breaks in commercial television programmes send millions of consumers to switch on electric kettles in the space of a few minutes, leading to overall demand increases of up to 2,800 MW.^[2] In anticipation of this surge, an appropriate number of units at Dinorwig (or other services competing for National Grid Reserve Service duty) may be brought on line as the closing credits start to roll. The monitoring of popular television channels is an important factor in electricity grid control centres.

type=printed postcards

theme=topographical: british

sub-theme=wales

county/ country=caernarvonshire

number of items=single

period=1945 - present

postage condition=unposted