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Here we can see the first important difference between a good power supply and a generic one: cooling.
Of course to cut costs generic power supplies don’t have PFC circuit (read more about PFC on our Power Supply Tutorial) and also we assume that they have a low efficiency, below 70%, but of course we will measure efficiency during our tests with this power supply. Another main external difference between a good power supply and a generic one are the cables used.
Label the power supply with peak wattage, which can only be achieved during some seconds and, in some cases, in less than one second. Subscribe To Our NewsletterJoin our mailing list to receive the latest news and updates from our website.
The roofs of America could supply almost 40 percent of its electricity without technological advance.
Despite the economies of scale of California's huge solar power stations, there are advantages to placing solar panels on building roofs. However, there is only so much roofing space to go around, and much of it is shaded by trees or other buildings.
Now, however, NREL has updated its work and concluded the potential is almost twice as high as previously thought.
Only 26 percent of the roof space of small buildings, mostly houses, is suited to covering with panels. Not surprisingly there is plenty of variation by region, with California in a position to draw 74 percent of its electricity from rooftop solar. The calculations assume 16 percent average module efficiency, something comfortably exceeded in the lab and likely to not last long commercially. Although Europe would almost certainly come off worse in an equivalent global analysis, most of the world is even better positioned to draw much of our power from the space above our heads. Power supply in India has been fully restored after a two-day blackout hit much of the country, officials say.
More than 600 million people were affected by the power cut after three electricity grids collapsed, one for a second consecutive day. The power failure caused havoc, with whole cities grinding to a halt and transport and other services badly hit. The breakdowns in the northern, eastern and north-eastern grids affected 20 of India’s 28 states. Power System Operation Corporation chief SK Soonee said electricity had been restored in all three grids overnight on Tuesday by engineers from the state-owned company.
The blackout caused chaos on transport networks with hundreds of trains stranded and water supplies interrupted. Other areas affected included Punjab, Haryana, Uttar Pradesh, Himachal Pradesh and Rajasthan in the north, and West Bengal, Bihar, Orissa and Jharkhand in the east. In the eastern state of West Bengal, around 200 miners were trapped underground as lifts failed, but officials later said they had all been rescued.
One shopworker in Delhi, Anu Chopra, 21, said: “I can understand this happening once in a while but how can one allow such a thing to happen two days in a row?
In a statement on national TV on Tuesday evening, Power Minister Sushil Kumar Shinde blamed the crisis on states taking more than their quota of power from the national grid. He said he had appealed to states to stop this and instructed his officials to penalize those states which did. The power minister of Haryana state, Captain Ajay Singh, was quoted by NDTV as saying his was not the only state with overdraw from the grid. Also on Tuesday it was announced that Sushil Kumar Shinde had been promoted to the post of home minister, in a widely anticipated cabinet reshuffle.
Power cuts are common in Indian cities because of a fundamental shortage of power and an ageing grid – the chaos caused by such cuts has led to protests and unrest on the streets in the past. But the collapse of an entire grid is rare – the last time the northern grid failed was in 2001. India’s demand for electricity has soared in recent years as its economy has grown but its power infrastructure has been unable to meet the growing needs. Correspondents say unless there is a huge investment in the power sector, the country will see many more power failures.
A state of vast, untouched nature and few people, Alaska’s identity and development have been defined by its unique geography. Alaska is the second largest oil producer in the United States, yet our residents pay some of the highest gas and electricity prices in the nation.
It is in our state’s best interest of Alaskans to develop clean, local and more stably priced methods of electricity production.

As concerns about rising fossil fuel prices, energy security, and climate change increase, renewable energy can play a key role in producing local, clean, and inexhaustible energy to Alaska. Renewable resources, over the long term, can provide energy at a known cost that is not susceptible to the vagaries of fossil fuel supply and demand. In 2011, about 9% of all energy consumed, and about 13% of total electricity produced came from renewable energy sources. With 16% of the country’s landmass and less than 0.3% of its population, Alaska’s unique geography has driven development of its energy supply infrastructure— power plants, power lines, natural gas pipelines, bulk fuel “tank farms” and related facilities. Powered by wood until 1927, Fairbanks switched to coal after the Railroad provided access to Nenana and Healy coalfields. Completed in 1986, the state-owned Willow – Healy Intertie now provides a diversity of energy sources to the six Railbelt electrical utilities.
Chugach Electric and ML&P’s new 183 MW natural gas-fired power plant in Anchorage was commissioned in 2013. At the end of 2013 a little more than 2,000 MW of installed power generation capacity will exist along the Railbelt, serving an average annual load of about 600 MW and a peak load of more than 800 MW. During the early 1980s, the state completed four hydropower projects to serve Ketchikan, Kodiak, Petersburg, Valdez, and Wrangell.
With some notable exceptions, most of the rest of Alaska’s power and heating needs are fueled by diesel that is barged from Lower 48 suppliers or transported from petroleum refineries in Nikiski, North Pole, and Valdez.
Renewable Energy Alaska Project is a coalition of energy stakeholders working to facilitate the development of renewable energy in Alaska through collaboration, education, training, and advocacy. The idea behind this review is to be as much educational as possible and answer a few very important questions: how much power a generic power supply can really deliver? In the case of power supplies, generic units cost just a few dollars and usually come for free on low-end cases.
Even when a good power supply uses just one 80 mm fan on the rear it has far more venting holes on the front (with several units completely replacing the front panel with a mesh), which improves airflow and prevents your computer from overheating.
The higher the efficiency the better – an 80% efficiency means that 80% of the power pulled from the power grid will be converted in power on the power supply outputs and only 20% will be wasted. Generic units are usually based on the very first ATX specification, which was written at a time when computer power consumption was concentrated on the +5 V line.
Our power supply was labeled as a 500 W unit and one of the goals of this review is to check what the real wattage of this unit is. Semiconductors have a physical effect calling de-rating where they lose their ability to deliver current (and thus power) with temperature. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil.
A new assessment of the potential of America's rooftops for solar power shows that they can make a much larger contribution to electricity requirements than previously recognized. Transmission costs are lower, grid stability higher, and the environmental problems associated with wilderness constructions disappear. Even if problems of storing energy for nighttime and cloudy days can be solved, rooftop solar looked like being only a modest part of the solution. The new report estimates a capacity of 1,118 gigawatts, producing 1,432 terawatt-hours a year.
To correct this, NREL researchers used satellites and light detection and ranging (LiDAR) technology. On the other hand, 83 percent had enough unshaded, south-facing space to make it worth putting photovoltaics (PV) on at least part of their roof. Roads connect only a small number of communities, and most villages are accessible only by boat or plane. According to the Energy Information Administration, Alaska was ranked third in 2011 for high electricity costs. Government officials have increased funding and support for renewable energy projects in recent years, including the creation of the Alaska Renewable Energy Grant Fund. Because there are little or no fuel costs associated with generating electricity from renewable sources, more Alaskans are looking to resources like wind, geothermal, hydropower, tides, waves, solar, and biomass to hedge against the price volatility of natural gas and diesel.
With some of the best renewable energy resources in the country, Alaska has an opportunity to be a leader in their development and bring new revenue streams into the state’s economy. The largest share of renewable-generated electricity comes from hydroelectric energy (63%), followed by wind (24%), biomass (10%), geothermal (3%), and solar (0.2%). Alaska has over 150 remote, stand-alone electrical grids serving villages, and larger transmission grids in Southeast Alaska and the Railbelt.
The Anchorage area has enjoyed relatively low-cost heating and power since expansion of the Eklutna hydro plant in 1955 and the development of major Cook Inlet oil and gas discoveries in the 1960s.

Major power generation facilities along the Railbelt include Chugach Electric Association’s 430 MW natural gas-fired plant west of Anchorage at Beluga, Anchorage Municipal Light and Power’s 266 MW natural gas-fired plant in Anchorage, Golden Valley Electric Association’s 129 MW facility near Fairbanks fueled by naptha from the Trans-Alaska Pipeline, and the 126 MW state-owned Bradley Lake hydroelectric plant near Homer. Homer Electric Association broke ground on a 35 MW steam turbine in Nikiski in 2012, and has plans to build a 50 MW natural gas power plant in Soldotna soon.
At 76 MW, the “Four Dam Pool” projects displace the equivalent of about 20 million gallons of diesel fuel per year for power production. After freeze-up, many remote communities must rely on the fuel that is stored in tank farms, or pay a premium for fuel flown in by air tankers.
No attention to the product finishing is given and they follow the traditional ATX layout, with an 80 mm fan on the rear and some venting holes on the front of the unit. The power supply is a key element in the computer heat dissipation, as it is in charge of pulling hot air from inside the computer (through these holes) to the outside, through the power supply fan. This translates into less consumption from the power grid (as less power needs to be pulled in order to generate the same amount of power on its outputs), meaning lower electricity bills.
Nowadays power consumption is concentrated on the +12 V outputs, as the CPU (through ATX12V and EPS12V connectors) and video cards are connected to the +12 V output, not +5 V.
So a maximum power measured at a lower temperature may not be achieved when temperature is increased. They scanned the structures making up 128 cities and extrapolated to the other 77 percent of American buildings. Together these modest sized patches represent a vast amount of territory waiting to be put to use, with almost twice the combined capacity of medium-sized and large buildings. She enjoys searching the internet for the hottest events from around the world and writing an article about it. Your continued use of this site beyond the first page displayed is an acceptance of our terms and conditions. Started in 2008, this program has provided over $202.5 million to 227 qualifying renewable energy projects and renewable resource development studies. Renewable energy capacity is growing quickly: in 2012 42% of all new generating capacity in the US came from wind.
The Railbelt electrical grid follows the Alaska Railroad from Fairbanks through Anchorage to the Kenai Peninsula and provides 80% of the state’s electrical energy.
In Palmer, Matanuska Electric Association plans to construct a 171 MW dual fuel generation station near Eklutna that can burn natural gas or diesel.
Other major hydro facilities in the communities of Juneau and Sitka are now being expanded. Currently state and federal authorities are supporting a large program to fix leaky tanks, improve power generation and end use efficiency, and exploit local renewable energy sources such as wind, biomass, and hydro. Allowing for variations in sunlight at these locations, this could produce 800 terawatt-hours each year. The details matter to her, so she makes sure the information is easy to read and understand.
Many rural villages depend primarily on diesel-run generators to provide their homes and businesses with electricity, and fuel oil to generate heat. In comparison, the average cost of electricity in the United States in 2011 was $0.09 per kWh. The fund is supported through capital budget appropriations and is administered by the Alaska Energy Authority. All of these generators will decrease reliance on less efficient 40-year-old generators at Beluga.
If fact back in the days that good power supplies were hard to find one trick several technicians used to select a power supply among several was by selecting the heaviest one. This generic power supply we bought, for example, had only two cables, one with two standard peripheral power connectors and another also with two standard peripheral power connectors plus one floppy disk drive power connector, plus the main motherboard cable and an ATX12V cable – no SATA power connectors (even though there are generic units with these connectors around) and no auxiliary power connector for the video card. There is also a major difference on how the +3.3 V output is obtained, but we will discuss this later in details. Diesel must be shipped on barges or delivered by airplane, and is normally bought in bulk to be stored in large tanks in the villages.
Grants have gone to support a wide variety of projects including a ground source heat pump system at the Juneau Airport, a wood fired boiler at Thorne Bay School In 2012 the Legislature extended the Alaska Renewable Energy Fund for another 10 years, until 2023. When the price of oil spikes, as it did in the summer of 2008, rural Alaska’s reliance on diesel and fuel oil can be devastating.

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