Solar-plus-storage vs. wind-plus-storage

Jun 1, 2022 12:40 PM ET
  • US researchers have come up with an analytical means to evaluate the costs and net value of various configurations of large-scale wind and also solar projects coupled with battery storage. They identified 6 trends in the United States electricity market and also located that their framework is aligned with existing commercial practices.
Solar-plus-storage vs. wind-plus-storage
Image: Seagul, pixabay

Researchers from the US Department of Energy's Lawrence Berkeley National Laboratory have contrasted the prices of numerous of solar-plus-storage setups with those of other wind-plus-battery plants across 7 US wholesale electricity markets.

" We seek to recognize the fads in the commercial growth of hybrids and to recognize factors that may change those trends with an examination of the expenses and revenues of various hybrid arrangements, allowing organizers to make more enlightened presumptions regarding the setup and behavior of hybrids," they said. "We additionally seek to recognize which configuration choices are extra impactful than others on market price as well as prices."

They explained their findings in "Maintain it short: Checking out the effects of setup choices on the recent economics of solar-plus-battery and also wind-plus-battery hybrid energy plants," which was lately released in the Journal of Energy Storage. The group of researchers considered historic wholesale market power prices from 2012 to 2019 and current component costs for renewable resource projects. They shaped their evaluation by thinking about battery duration as well as capacity, grid affiliation capacity, the size of PV systems relative to inverter capacity, and the links in between batteries and also generators.

They additionally considered hybrid expenses based upon funding costs and battery lifetimes.

"We create an analytical strategy that system organizers might make use of with case details specifications to evaluate hybrid advancement trends and demonstrate its informative power by qualitatively contrasting the appealing hybrids we design to recently created hybrids or projects in the near-term development pipeline," they stated.


The researchers determined the net value of each of the proposed arrangements. They likewise rely upon a linear optimization program to determine a generator's income based on historic wholesale power market value.

"The objective of the optimization is to take full advantage of income from buying and selling power from the hybrid at a hourly differing wholesale power rate, accounting for a linear deterioration penalty related to the battery charge and also discharge power," they stated.

They discovered that battery duration and capacity have the biggest effect on the net value of either solar or wind hybrid plants. They claimed the excellent arrangements are those with a battery period varying from two to four hours. In solar-plus-storage projects, the battery capacity with the highest net value ought to be between 25% and also 100% of the PV plant nameplate capacity, depending upon the area and also the availability of monetary rewards, while the highest net value for wind-plus-storage plant ought to be around 25% of the wind capacity, with or without the tax obligation credit ratings.

"AC vs. DC coupling as well as the sizing of the solar panels about the inverter in solar hybrids seem secondary," they said.

The researchers claimed their analytical framework straightens with existing commercial patterns and also determined six primary fads in US electricity markets. Solar-plus-battery projects are a lot more common than their wind counterparts, while solar hybrids are more common than wind hybrids. Both solar and also wind hybrids are a lot more common in the bulk power system operated by the California Independent System Operator (CAISO), while battery periods are commonly in between one as well as 4 hours. Battery-to-generator capacity ratios are bigger for solar than wind hybrids, however hybrids in the CAISO have a factor of interconnection capacity similar to the sustainable generator capacity. Additionally, DC-coupled projects make use of inverter filling ratios ILRs at the exact same levels of those for off-grid solar.

The scientists claimed that in the future, they intend to improve their analysis of the expense and hybridization cost-reduction capacity.

"Future work can refine battery cost as well as degradation quotes for specific battery modern technologies, together with incorporating estimates of cost fads into the future to make even more specific estimates of the net value of details hybrids," they said.

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