The Holy Grail of the solar industry — reaching grid parity — may no longer be a distant dream. Solar may have already reached that point, at least when compared to nuclear power, according to a new study by two researchers at Duke University.

It’s no secret that the cost of producing photovoltaic cells (PV) has been dropping for years. A PV system today costs just 50 percent of what it did in 1998. Breakthroughs in technology and manufacturing combined with an increase in demand and production have caused the price of solar power to decline steadily. At the same time, estimated costs for building new nuclear power plants have ballooned.

The result of these trends: “In the past year, the lines have crossed in North Carolina,” say study authors John Blackburn and Sam Cunningham. “Electricity from new solar installations is now cheaper than electricity from proposed new nuclear plants.”

Source: The Energy Collective

The Great American Algae Rush is in full swing.

Dozens of companies and hundreds of scientists are working hard to engineer algae to produce green — literally and figuratively — fuel.

The endeavor is at the crossroads of energy and science, and the trend is spreading worldwide.Why? Because some algae strains can produce 10 or more times more fuel per acre than the corn that is used to make ethanol, or the soybeans used to make biodiesel.

Better still, you can grow algae on arid land and in brackish water, which avoids competing with food production, unlike the corn and soybeans that coat much of the Midwest’s farmland.

Best of all: algae consume carbon dioxide, combating greenhouse gas emissions.

But a new profile of the industry in the New York Times demonstrates that this technology has its share of pitfalls.

For one, efforts to engineer and manipulate the organisms has environmentalists concerned because algae are the base of the marine food chain.

For example: Screw up and over-engineer a strain, and suddenly you have an organism that’s out of whack with the biosphere, stripping water of its oxygen and harming fish — and maybe humans — in the process.

Source: Simply Green

The International Energy Agency (IEA) presented two new solar energy analyses in Valencia, Spain this week, a Solar Photovoltaic Energy Technology Roadmap and a Concentrating Solar Power Technology Roadmap.

The key finding from these is that 20-25% of global electricity production could be from solar energy by 2050.

In a blog post on our sister site, One Block Off the Grid, I just discussed how the United States and how rooftop solar fit into this. Below, mostly from the reports themselves, is a short discussion of what government’s role in all of this needs to be.

Source: Simply Green

Here’s an opportunity to wisely spend some of the $100 billion that Secretary of State Hillary Clinton promised at Copenhagen to cut the greenhouse gases of developing nations by aiding in the development of renewable energy infrastructure to by-pass fossil fuel dependence. (Previous story.)

Apparently one in four Chinese cities and seven out of 10 counties are without sewage-treatment plants, according to the People’s Daily. While there are many ways to treat sewage or municipal waste; one of the newest is the use of municipal solid waste to make renewable energy.

Converting waste to energy is done in several ways. One is making bio-gas from sewage (human or animal) to run gas-turbine driven electric power plants.

Another is to create a biofuel, such as that used by nearly every vehicle in Sweden’s fifth largest city Linköping. Greenhouse gas emissions there were reduced as much as 90% with the technology. It helped Sweden achieve a 9% below-Kyoto emissions cut with simultaneous 44% economic growth.

This presents an opportunity to kill two birds with one stone; by building the infrastructure in the developing world that uses municipal solid waste to make renewable energy. This would cut the greatest source of the rise expected in greenhouse gas emissions from fossil fuel use in the next decades: from fast-developing nations like India and China.

The developed world evolved water treatment technologies well before our knowledge of climate change drove us to invent uses for municipal solid waste as a source of renewable energy with no greenhouse gas emissions.

But now, nations that do not already have any sewage treatment infrastructure in place are well placed to leapfrog the developed world, which is only just starting to tap into waste-to-energy from municipal solid waste, or sewage.

For all kinds of municipal waste-to-energy companies, this presents a huge opportunity. The developed world has pledged $100 billion to develop renewable energy in the developing world. As I noted here, that money is not charity – as it is incorrectly framed in most media reports (previous story), but it will go to the renewable energy companies from those nations that get there first. This waste-to-energy plant pictured is from a New Zealand company that has apparently already built numerous large facilities throughout Asia.

Source: Simplygreen

Stanford scientists have developed featherweight, pliable batteries and supercapacitors in the form of everyday paper.

By coating a sheet of paper with ink made of carbon nanotubes and silver nanowires, the scientists were able to construct a highly conductive storage device that’s both low-cost and high-performance.

(The difference between a battery and a capacitor, you ask? both hold energy to be converted to electricity, but capacitors hold it for a shorter period of time. On the other hand, they can store and discharge energy much more rapidly.)

The batteries are so strong that you can crumple them and the performance does not degrade.Led by assistant professor of materials science and engineering Yi Cui, who previously created nano-size batteries using plastics, the researchers developed a solution that is more durable than conventional batteries.

Source: Smart Planet