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ScienceDirect - Energy Conversion and Management : Evaluation of small wind turbines in... - 0 views

www.sciencedirect.com/science micropower sciencedirect wind
shared by Hans De Keulenaer on 07 Jan 08 - Cached
  • The island of Barbados is 99% dependent on fossil fuel imports to satisfy its energy needs, which is unsustainable. This study proposes a 10 MW distributed wind energy scheme using micro wind turbines (WT) of horizontal (HAWT) and vertical axis (VAWT) configurations. These units are rated less than 500 W, and the scheme is hereafter referred to as mWT10. mWT10 is compared to the proposed 10 MW medium WT farm by the Barbados Light & Power Company (BL&P). The economic bottom line is the levelized cost of electricity (LCOE). The results highlight the BL&P proposal as the best economic option at BDS$0.19 per kWh, while that of both mWT10 configurations exceeds the conventional cost of BDS$0.25 by two to nine times. This is attributed to significantly higher relative installation and operational costs. However, the financial gap between mWT10 LCOE and the retail price of electricity is much smaller due to a large fuel surcharge passed on to each customer. Annual additional benefits of using wind energy include: greenhouse gas emissions savings of 6–23 kt of carbon dioxide; and anavoided fuel costs of BDS$1.5–5.3 million.
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Sandia, Stirling to build solar dish engine power plant - 0 views

www.sandia.gov/...Stirling.html electricity stirling
shared by Sergio Ferreira on 11 Feb 08 - Cached
  • making a six-dish mini power plant producing up to 150kW of grid-ready electrical power during the day.
  • with a net solar-to-electric conversion efficiency reaching 30 percent. Each unit can produce up to 25 kilowatts of daytime power.
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The Energy Blog: LED Lights Reduce Energy Consumption 48% in Cree Headquarters - 0 views

thefraserdomain.typepad.com/...led-lights-redu.html LED lighting
shared by davidchapman on 14 Nov 07 - Cached
  • davidchapman on 14 Nov 07
     
    The savings claimed here are against CFL, FL and HPS - not tungsten! Cree, Inc, a manufacturer of LED solid-state lighting components, released the results of the first phase of the conversion of its Durham headquarters to LED lighting, which has resulted in the use of 48% less energy than the lights they replaced and plans to convert all lighting at the headquarters and manufacturing facility to LED lighting.
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Pumped Hydro: Is it TOO Green? | PeteSinger - 1 views

www.renewableenergyworld.com/...pumped-hydro-is-it-too-green renewables methane hydropower
shared by Hans De Keulenaer on 10 Jan 11 - No Cached
  • In the latest Electric Power Research Institute Journal, an article titled "Hydropower Reservoirs: A Question of Emissions" notes that reservoirs used for hydropower and for pumped-hydro energy storage are not necessarily as green as you might imagine. Or rather, they might be too green: carbon-rich organic material that accumulates on the reservoir floor can be the source of carbon emissions. A recent study of the 90-year-old Lake Wohlen, in Switzerland, for example, found high emissions of methane, as recently reported in the journal Environmental Science and Technology, in an article titled: "Extreme Methane Emissions from a Swiss Hydropower Reservoir: Contribution from Bubbling Sediments."
  • F F on 11 Jan 11
     
    Applies to both hydro reservoirs (i.e. water pooled behind a dam) and hydro pools filled with pumped-hydro. Note that the latter, pumped-hydro, already carries the emissions profile of the energy used to power the turbine pumping the water against gravity, scaled up for conversion efficiency losses.
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The Century-Old Renewable You've Never Heard Of - Eos - 1 views

eos.org/...renewable-youve-never-heard-of renewables
shared by Hans De Keulenaer on 24 Jan 22 - No Cached
  • President Jimmy Carter signed a bill calling for 10,000 megawatts of OTEC capacity to be up and running by 1999. Then oil prices stabilized, administrations changed, and other than a few demonstration projects, nothing happened.
  • “When people actually have to build stuff that’s got to survive in the ocean and be insured, costs double. Insurance premiums triple,” he said. “And all of a sudden, what looked good when you announced it, you can’t actually get finance to build.”
  • Binger added that many small island nations still haven’t recovered from the debt they incurred during the oil crisis that began in 1979.
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Energy Systems for Sustainable Prosperity | SpringerLink - 1 views

link.springer.com/...978-3-030-78795-0_12 sustainability energy transition electrification hydrogen e-fuels
shared by Hans De Keulenaer on 17 Dec 21 - No Cached
  • Ecologically sustainable energy technologies comprise renewable energy supply together with improved efficiency of energy conversion and use. Together they can mitigate the climate crisis, greatly reduce pollution of air, water and land, create more jobs than are lost in the fossil fuel industries they replace, and contribute to energy independence and social equity. The best technical energy supply strategy is transitioning fossil fuelled electricity to renewables, electrifying most heating and transportation, and producing fuels by using renewable electricity to make hydrogen and ammonia. This technological transition is necessary and urgent, but unlikely to be sufficiently rapid to avoid irreversible climate change. Substantial demand reductions are needed by rich countries, beyond the technological measures of energy efficiency. This would entail an end to growth in energy production, materials extraction, land clearing and population, that is, the creation of a steady-state economy within Earth’s biocapacity.
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