Revisiting the Marine Current Turbines capacity factor

Some while ago, in this blog post we calculated an apparent capacity factor for Marine Current Turbine's SeaGen in Strangford Narrows of 38%.

We've been rooting around in OFGEM's ROC database to see if there's further information available on SeaGen's performance.

Looking at the ROC register, which reports the number of MWh generated for ROC-accredited projects, it seems that the SeaGen achieved monthly average capacity factors of up to 58% in its best years.

This analysis is based on SeaGen having a capacity of 1.2 MW and is consistent with another blog analysis we did of the capacity factor of the technology.



This analysis begs some other questions though - what went wrong in 2011?  and has the technology been abandoned since 2014? It also seems that the capacity factor was pretty variable, pointing to a lack of reliability - fair enough in a prototype technology.

We'll be using this approach  to look at other technologies too, in the upcoming Redfield review of tidal technologies and its companion volume - Redfield review of wave technologies.  Contact us for details: info(at)redfieldconsulting.co.uk

Hours on the clock

Marine Current Turbines have now racked up 1000 hours of export to the National Grid, as reported here.

MCT claims an average capacity factor of 66% for the period of operation. We have calculated a capacity factor, based on ROC register figures, which shows a steady(ish) increase to around 25% in November 2009. This calculated CF does not make any allowance for downtime, availability of marine mammal onservers, or (crucially for MCT) the limitations imposed by daylight-only working.

Since daylight in November is less than 50% of the time, and the trend is upwards, we can see that a claimed 66% capacity factor in December could be realistic.

If true, it's excellent news for the company and the technology, as it's always all about cost per MWhr, and more MWhrs means a better metric.

MCT exports power to the Grid

MCT has now joined the exclusive club of marine renewables developers who have exported power to the Grid. See their press release here.

The exciting and different thing about MCT's news, relative to earlier announcements from OpenHydro, WaveGen's Limpet, Ponte de Archimedes and a few others, is that the Sea Gen is a commercially sized device, with 1.2 MW installed capacity. Its competitors at this stage are in the hundreds of kW range, so this is a different level of achievement.

Well done MCT!

Tidal power into the Grid

Congratulations to OpenHydro, who have achieved the first power export into the National Grid from a tidal turbine (at least that Redfield is aware of). The Telegraph's coverage of the story is here.

They've narrowly beaten Marine Current Turbines, who are installing and commissioning their device in Strangford Lough at the moment.

Newsflash - MCT installs in Strangford Lough

Congratulations to MCT for getting into Strangford Lough. It's well known that the installation has been the victim of a number of spanners in the works, so a big hand is due. We'll be keenly interested to see how commissioning goes, and hope that MCT is successfully powering those thousand local homes in short order.

The Guardian has covered the story pretty thoroughly here.

MCT/npower

Interesting announcement from MCT and npower. npower has joined with MCT in a new company Seagen Wales, which will pursue the project.

They say that "Development of the site will start with a full assessment and detailed surveys of the environment and tidal resources, followed by preparation of an outline scheme incorporating the studies' outcomes.

Studies are about to get started and will last throughout 2008, with a consent application likely to be submitted in mid 2009. Construction and commissioning timescales will be subject to the length of the planning process, but it is anticipated this could take place between 2011 and 2012."

Of the big six utilities (Centrica, EdF, Eon, RWE, SSE, Scottish Power), five have now announced marine renewables aspirations:

EdF has a shareholding in Marine Current Turbines;
Eon has an involvement in the Lunar/Rotech Pembrokeshore tidal project
RWE (npower) has just announced this investment
SSE has the Neptune tidal and Aquamarine wave interests
Scottish Power (Iberdrola) has its Orkney Pelamis project

Surely Centrica's got to move soon?