Such claim if accurate would call into question many energy investment decisions.
Eroi solar panels.
There are a wide variety of estimates of solar pv s eroi as well in part because the technologies and production techniques are improving fast a major reason for the large price reductions over the past decade.
However when the number is small.
In fact solar has reached prices today that are.
There is a fast growing interest in better understanding the energy performance of pv technologies as evidenced by a large number of recent studies published on this topic.
7 to 10 years ahead of what i forecast in 2015.
Actually solar energy has superb energy return on energy investment eroei 1 to 4.
Solar energy has low even counterproductive energy return on energy investment eroei short answer.
The goal of this study was to do a systematic review and a meta analysis of the embedded energy energy payback time epbt and energy return on energy invested eroi metrics for the crystalline si and thin film pv technologies published in 2000 2013.
In the case of photovoltaic solar panels the iea method tends to focus on the energy used in the factory process alone.
In 2016 hall observed that much of the published work in this field is produced by advocates or persons with a connection to business interests among the competing technologies and that government agencies had not yet provided adequate funding for rigorous analysis by more neutral observers.
50 to 100 years ahead of what the iea forecast in its 2010 world energy outlook depending on how one extrapolates iea s forecasts from 2010.
10 to 15 years ahead of what i forecast in 2011.
30 to 40 years ahead of what the iea forecast in its 2014 solar technology roadmap.
That is to say the eroi of solar panels being made in 2013 is quite a bit higher than of solar panels made in 2000.
In fact published eroeis for solar pv and wind might be called misleading.
A recent paper by ferroni and hopkirk 2016 asserts that the eroei also referred to as eroi of photovoltaic pv systems is so low that they actually act as net energy sinks rather than delivering energy to society.
The lowest estimate produced by weissbach et al was thoroughly discredited by technology entrepreneur ramez naam as glaringly low and he estimates the eroi of solar pv at above 10 and probably above 15 and rising.
The result is a serious bias that tends to make the eroeis of solar pv as well as other intermittent energy sources such as wind appear far more favorable than they would be if a level playing field were used.
When the eroi is large that means that producing energy from that source is relatively easy and cost effective.
That should be obvious increasing efficiency and lower energy costs per watt make it so.
Studies have given figures for the eroi of solar energy as low as 3 9 and as high as 45 45.
