NREL Report Counts Up Solar Power Land Use Needs

IEEE Spectrum has an update on the land required for solar power plants - Report Counts Up Solar Power Land Use Needs.

The report used land use data from 72 percent of all large solar plants installed in the U.S., and found that the total area requirements for a photovoltaic (PV) plant between 1 and 20 megawatt capacity is 8.3 acres per MW. For larger PV plants, the total area needed is 7.9 acres per MW, while concentrating solar power plants (CSP) need 10 acres per MW. When weighted by generation rather than capacity, the larger PV plants (3.4 acres per gigawatt-hour per year) and CSP plants (3.5 acres/GWh/year) do a bit better than smaller PV plants (4.1 acres/GWh/year).

This isnt the first time NREL has looked at solar land use, though it is the first time they used a whole lot of actual power plants to figure out the numbers. In the past, they estimated that to power all of the U.S. with solar power, it would require 0.6 percent of all the area in the country.

The new report says that a PV plant capable of powering 1 000 homes needs 32 acres. According to the U.S. Census Bureau, there are around 115 million occupied and fully used homes in the country. If we just scale up linearly (which is not, of course, how this would actually work), that means 3.68 million acres to power all of them. Thats equivalent to 5 750 square miles, or around 0.1 percent of all the land the US has to offer.

{ Read More }

USGS report reduces estimate of oil in Alaska

The Anchorage Daily News reports that oil reserve numbers in Alaska have been reduced by the USGS - USGS report reduces estimate of oil in petroleum reserve.

Recent drilling results indicate that the National Petroleum Reserve-Alaska contains roughly a tenth of the oil that federal scientists had previously estimated, the U.S. Geological Survey announced Tuesday.

Instead, the federal agency said, natural gas is the dominant energy resource in the 23 million-acre reserve across northern Alaska, and in nearby state waters. The findings are based on more than 30 wells drilled and other exploration in the NPRA over the past decade.

The agencys findings are in sync with declining investment by some oil companies, which have shed more than a million acres of leases in the reserve and are spending much less money on purchasing new ones.

And yet, the agency scientist who published the new estimates cautioned against overreacting. He stressed on Tuesday that the reserve does hold some decent-sized accumulations of oil -- particularly in the northeast, near Teshekpuk Lake -- and its potential for gas is "just phenomenal."

But until a North Slope gas pipeline is built, "a gas discovery is not a lot better than a dry hole," said the scientist, David Houseknecht.

{ Read More }