By Stephen Edelstein
Photovoltaic solar power field at Volkswagen plant in Chattanooga, Tennessee
Over the past few years, the cost of electricity generation from renewable-energy sources has decreased dramatically.
So much so, that renewable energy may have just hit an important milestone, according to one study.
In the U.S., wind and solar power are now cheaper sources of electricity than natural gasâ€”even without subsidies.
That essentially makes these two renewable-energy sources the cheapest unsubsidized source of electricity for utilities in the U.S.
That is the conclusion of investment bank and research firm Lazard’s latest Levelized Cost of Electricity analysis (pdf), which compares the cost of different methods of electricity generation.
This is done by dividing the total lifetime costs associated with an energy sourceâ€”be it a conventional power plant or a solar or wind farmâ€”and the amount of electricity that source can produce.
Within that framework, Lazard found the cost of unsubsidized utility-scale thin-film solar PV to range from $46 to $56 per megawatt-hour, while the range for wind was $32 to $62 per MWh.
In comparison, the range for natural gas was $48 to $78 per MWh, while coal was pegged at $60 to $143 per MWh.
However, because it focuses solely on cost, the Lazard analysis requires some contextualization.
One factor it leaves out is the cost of climate change, inclusion of which would certainly favor solar and wind over fossil fuels, notes Vox.
But Vox also notes that the Lazard analysis leaves out the fact that wind and solar are intermittent sources that don’t produce the same amount of electricity at all times.
That is why there is significant interest in pairing renewable-energy sources with energy-storage systems that can collect excess electricity for later use.
Solar farm used by West Hill House B&B
The rates for utility-scale thin-film solar PV also represent the most advanced solar-generation technology, being deployed on a large scale.
Despite the decreases in costs, rooftop solar panels or residential and commercial applications are still expensive, and substantially more costly per MWh than utility-scale thin-film solar PV, according to Lazard.
One other factor brought up by Vox is that, in developed countries like the U.S., renewable energy does not compete against new power plants.
Instead, it competes against existing plants that have already been paid off, meaning their effective costs are much lower.
Cooling tower at power plant, by Flickr user Paul J Everett (Used under CC License)
But solar and wind at least have current government subsidies in their favor.
These can take renewable energy from being competitive with natural gas to being substantially cheaper.
So even if renewable sources could compete without subsidies, it will probably be better for their future growth if those subsidies remain in place.Î¦
From classics to modern performance cars, Stephen Edelstein loves anything with four wheels, especially if thereâ€™s an interesting story attached. When heâ€™s not writing automotive news articles for High Gear Media, Stephen can often be found combing through local car shows for something he hasnâ€™t seen before, and sharing the results with anyone on the Internet willing to pay attention. Stephen has a Master’s degree in History from Clark University. He currently lives in Connecticut. He wrote this article for Green Car Reports.