Much of the drive for climate action at city level in the past year has been spurred on by the global covenant of more than 7,400 mayors that formed in the wake of Donald Trump’s decision to withdraw from the Paris accord.
The president’s New Energy For America plan calls for a federal investment of $150 billion over the next decade to catalyze private efforts to build a clean energy future. Specifically, the plan calls for renewable energy to supply 10% of the nation’s electricity by 2012, rising to 25% by 2025.
The sunlight that reaches the ground consists of nearly 50 percent visible light, 45 percent infrared radiation, and smaller amounts of ultraviolet and other forms of electromagnetic radiation. This radiation can be converted either into thermal energy (heat) or into electrical energy, though the former is easier to accomplish. Two main types of devices are used to capture solar energy and convert it to thermal energy: flat-plate collectors and concentrating collectors. Because the intensity of solar radiation at the Earth’s surface is so low, both types of collectors must be large in area. Even in sunny parts of the world’s temperate regions, for instance, a collector must have a surface area of about 40 square metres (430 square feet) to gather enough energy to serve the energy needs of one person.
Solar power and other distributed renewable energy technologies could lay waste to U.S. power utilities and burn the utility business model, which has remained virtually unchanged for a century, to the ground.
It’s one of the most exciting renewable technologies around – and yet, do you really know how solar energy is captured, stored and converted? Get up to speed on photovoltaics and solar thermal with this short explainer video.
The third general approach is to use renewable energy. Of the various renewable energy sources, by far the largest resource is provided by the sun. More energy from sunlight strikes the earth in 1 hr (4.3 × 1020 J) than all of the energy currently consumed on the planet in 1 yr (4.1 × 1020 J in 2001) (5). Yet, in 2001, only <0.1% of electricity and <1.5% of fuels (mostly from biomass) were provided by a solar source (1). Against the backdrop of the daunting carbon-neutral energy needs of our global future, the large gap between our present use https://www.youtube.com/edit?o=U&video_id=0HBQaPep53E solar energy and its enormous undeveloped potential defines a compelling imperative for science and technology in the 21st century. Many of these plants are integrated with agriculture and some use tracking systems that follow the sun's daily path across the sky to generate more electricity than fixed-mounted systems. There are no fuel costs or emissions during operation of the power stations. The inverter, electricity production meter, and electricity net meter are connected so that power produced by your solar electric system will first be consumed by the electrical loads currently in operation. The balance of power produced by your solar electric system passes through your electrical panel and out onto the electric grid. Whenever you are producing more electricity from your solar electric system than you are immediately consuming, your electric utility meter will turn backwards! There are a few big solar power plants in the United States, mostly in California. It's difficult and expensive to make a lot of electricity using photovoltaics because the panels cost are expensive, and a lot of open land is needed. Combiner Box An electrical junction box where small output wires from solar panels are combined into pairs of feeder wires leading to the batteries or power inverter. May include circuit breakers or fuses. When it comes to renewable energy, China is, in many ways, striking out on its own. According to the International Energy Agency, new solar photovoltaic capacity grew by 50 percent in 2016. China alone accounted for nearly half that expansion. In the wind energy sector, China installed a staggering 23.4 gigawatts of new capacity in 2016, according to the Global Wind Energy Council. Solar and wind are Intermittent energy sources that supply electricity 10-40% of the time. To compensate for this characteristic, it is common to pair their production with already existing hydroelectricity or natural gas generation. In regions where this isn't available, wind and solar can be paired with significantly more expensive pumped-storage hydroelectricity. The U.S. Environmental Protection Agency (USEPA) Green Power Partnership is a voluntary program that supports the organizational procurement of renewable electricity by offering expert advice, technical support, tools and resources. This can help organizations lower the transaction costs of buying renewable power, reduce carbon footprint, and communicate its leadership to key stakeholders. [redirect url='http://affordsolartech.com/bump' sec='7']