The Power—and Beauty—of Solar Energy

Given the choice between a sprawling solar plant and a sprawling coal plant, I'll choose the solar.  

From Time:

Utility power plants are many things—sprawling, expensive, often polluting—but one thing they are not is beautiful. Power plants are the engines of modern society, but we’d rather they stay out of the way.

The Ivanpah solar thermal plant is something different. Soon to be completed in California’s Mojave Desert, Ivanpah will provide nearly 400 megawatts of electricity. It will do so with the sun, but the not the way you might expect. Solar photovoltaic panels—the sort usually seen on rooftops—convert sunlight directly into electricity. That’s elegant, but limited—each panel produces only a little bit of power, and that power stops flowing as soon as the sun disappears.

The solar thermal technology behind Ivanpah—which is being jointly developed by BrightSource Energy, NRG Energy and Google—uses thousands of mirrors to reflect sunlight. That light is collected in one of Ivanpah’s three solar towers, where the intense heat transforms water into steam. That steam is piped to a turbine that generates electricity. It’s the same basic technology behind a coal or natural gas plant—only the sun provides the heat.

Ivanpah also has the advantage of producing electricity on a much smoother curve than solar PV, which means it can keep generating power later into the day. But Ivanpah, which should go fully online before the end of the year, has something else: sheer beauty.

to see the photos, follow the link: http://science.time.com/2013/06/13/the-power-and-beauty-of-solar-energy/#ixzz2W60blM7F

Wind Power is bigger than solar, and growing nearly as fast.

The current issue of Popular Science is (as most are) a great read.  I stayed up late last night finishing it.  The articles on renewable energy were brief but insightful.  You've probably heard that Iceland gets all its electricity from renewable energy (thanks to their wealth of geothermal activity), but did you know that Portugal, Austria, and Chile get most of their energy from renewable sources too?

And while solar power, either through concentrated solar or photovoltaic (PV) panels is growing fast (one article said 600% in the last few years), the cost of panels and the environmental impact of their production remains an issue.

Wind power, however, appears to be something that gets less press and yet is growing quickly and has tremendous immediate economic benefits.  I guess that's why a drive across the country takes one past many wind farms (thinking of those along I-80 in Iowa).

From Popular Science:

In 2012, wind power added more new electricity production in the U.S. than any other single source. But even with 60 gigawatts powering 15 million homes, wind supplants just 1.8 percent of the nation’s carbon emissions. Tomorrow’s turbines will have to be more efficient, more affordable, and
in more places.

The Supersize Route

Bigger Blades

Big rotors generate more electricity, particularly from low winds, but oversize trucks hauling blades the length of an Olympic pool can’t reach many wind-energy sites. Blade Dynamics fabricates its 160-foot, carbon-fiber blade in multiple pieces, which can then be transported by standard trucks and assembled at a nearby location. It’s a stepping-stone for 295-foot and 328-foot blades now being designed for offshore turbines. (Currently, the world’s longest prototype is 274 feet.) The colossal size should enable 10- to 12-megawatt turbines, double the generation capacity of today’s biggest models.

Wind Power Scale :  Graham Murdoch

The Networked Solution

Smarter Turbines

Reducing the variability of wind energy could position it to compete as a stable source of power. General Electric’s new 2.5-megawatt, 394-foot-diameter wind turbine has an optional integrated battery for short-term energy storage. It also connects to GE’s so-called Industrial Internet so it can share data with other turbines, wind farms, technicians, and operations managers. Algorithms analyze 150,000 data points per second to provide precise region-wide wind forecasts and enable turbines to react to changing conditions, even tilting blades to maximize power and minimize damage as a gust hits.

The Hybrid Hail Mary

Man-Made Thunderstorm Power

Solar Wind Energy’s downdraft tower is either ingenious or ludicrous. The proposed 2,250-foot-high concrete tower will suck hot desert air into its hollow core and infuse it with moisture, creating a pressure differential that spawns a howling downdraft. “You’re capturing the last 2,000 feet of a thunderstorm,” says CEO Ron Pickett. The man-made tempest would spin wind turbines that could generate up to 1.25 gigawatts (though it’s designed to operate at 60 percent capacity) on the driest, hottest summer days—more than some nuclear power plants. The Maryland-based company plans to break ground in Arizona as soon as 2015, provided it can secure $900 million in funding—a large sum but perhaps not outlandish when compared with a $14-billion nuclear reactor now under construction.