Will we ever be able to get all of our energy from renewable sources? There is certainly enough supply available. Enough sunlight hits the Earth every hour to power the entire human world for a year. But right now, it would take a 310,000-square-mile solar farm (about twice the size of Oregon), or 6 million wind turbines to capture enough sunshine or wind to provide all of the world’s electrical power.
If that sounds like a lot, it is– which is why we will continue to use a mix of sources including natural gas and coal to meet our electrical demand for some time to come. The renewable numbers will continue to shrink as long as the technology and our efficiency improves faster than the population grows. In the mean time, coal, despite being the dirtiest fuel available, is still abundant and still produces 30 percent of the world’s energy. In 2012, the U.S. used coal to produce 43 percent of our electricity, while in China coal produced 81 percent. In other places, like South Africa, it contributed over 90 percent.
While there are a number of problems associated with burning coal, the biggest is the amount of carbon dioxide it produces: Coal combustion generates anywhere between 200 and 230 pounds of CO2 for every million BTUs of heat produced. That is roughly twice the amount emitted by natural gas.
The new EPA Clean Power Plant rule will put pressure on utilities to either clean up their coal plants or switch to a cleaner fuel. Many are already switching to natural gas, but another approach that has been talked about for a long time, carbon sequestration, is finally getting a chance to demonstrate its capabilities in a full-scale commercial operation.
Just this week, NRG announced the Petra Nova Carbon Capture Project, the world’s largest post-combustion carbon capture power generation plant. The project will be a joint venture between NRG’s wholly-owned subsidiary Petra Nova Holdings, and JX Nippon Oil & Gas Exploration Corp.
According to the press release, this commercial-scale carbon capture and storage (CCS) system will utilize existing technology to capture 90 percent of the carbon dioxide (CO2) in the processed flue gas from an existing coal plant in Fort Bend County, southwest of Houston. Construction on the project has already begun.Click to continue reading »