POWER September 2010 - 13

5. Subsea extension cord. The 20-MW Wave Hub is being
installed in waters 50 meters deep and nearly 16 kilometers off the
coast of Cornwall in South West England. The 12 metric ton-device
will connect groups of developmental wave energy devices to the national
grid using four berths. Each covers 2 square kilometers. Courtesy:
South West Regional Development Agency
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than half its funding from the European Regional Development
Fund Convergence program and nearly £10 million from the UK
government. The UK already hosts a research center that focuses
on wave and tidal development offshore near the Orkney
Islands. The European Marine Energy Center (EMEC) enables a
global range of developers and devices, as well as academic
institutions and regulatory bodies, to test full-scale grid-connected
prototypes in rough wave and tidal conditions.
Among the latest devices to arrive at that test site is a second-generation
giant wave energy device built by Edinburgh
company Pelamis Wave Power. Nearly 180 m long, the P2 machine
is far larger than the original Pelamis prototype previously
tested at EMEC in 2004. The device is being tested by
E.ON UK-the first major power utility to make use of EMEC's
facilities. E.ON has said that successful tests could result in
much bigger arrays of the P2 being built around Orkney.
The World's First Two-Stage
Turbocharged Gas Engine
GE launched what it is calling the world's first two-stage turbocharged
gas engine this June. The new technology is initially
being applied to its Jenbacher J624 engine (Figure 6), essentially
upgrading the 24-cylinder gas engine GE introduced in
2007 for commercial power generation, but the company plans
to offer it with other engines.
According to GE, when using the new system it developed
with specialists from ABB Turbo Systems, the J624 achieves
nearly 10% higher output-bumping it from 4 MW to 4.4 MW.
It also offers an electrical efficiency of 46.5%, an increase of 1
percentage point. The improved machine is now better suited
for operation in hot and humid environments and combined
heat and power (CHP) plants. (For more on GE's Jenbacher J624
and its applications, see POWER's September 2009 story, " Top
Plants: Royal Pride Holland Commercial Greenhouse Cogeneration
Plant, Middenmeer, North Holland Province, Netherlands. " )
" The advanced boost pressure allows us to significantly push
the gas engine operating range and maintain full output and
efficiency at high ambient temperatures and high elevations, "
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POWER September 2010

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