Polaris solar PV net news: recently, the United States Department of energy (DOE) Web site “improving solar thermal power technologies, performance and Schedulability” study. The report is “on the road to SunShot” one of a series of studies.
The report pointed out that, since the United States Department of energy released in 2012 “SunShot vision research”, the global solar thermal power installed capacity has increased by three times, 4500MW, United States running the installed capacity has increased by three times in the territory, up to 1650MW. United States solar thermal market growth mainly by the State and Federal Government policies support driver. Renewable energy quota system (RPSs) and 30% of the Federal investment tax credit (ITC), as well as policies for federal loan guarantees, for solar thermal power project developers in the United States Southwest construction opportunities for solar-thermal power stations.
Figure 1 is a trough and Tower system of the cost of electricity (LCOE) declines and the 2020 SunShot target, shows the cost of solar thermal power systems show a declining trend, to achieve the United States DOE SunShot program cost targets set by: 2020 dropped to 6 cents per kWh basis. “SunShot vision research” predicted the cost of investment and the development of the current situation of comparison, 2015-Tower power station costs fell in line with expectations, the main benefit from the falling cost of heliostats.
Figure 1 SunShot vision research reports published since the trough and Tower system cost reduction (SVS=SunShot vision research (Department of 2012), OTPSS= on the road to SunShot)
Although the trough and Tower cost has been reduced, but the acceptance of solar thermal power generation technology and market deployment receive PV costs continue to reduce the negative effects. However, if solar thermal power technology due to thermal storage system with the flexibility, this negative effect could be weakening. United States national renewable energy laboratory (NREL) recently with heat storage system of solar-thermal power stations and PV systems of different proportion of renewable energy power generation in California running + capacity compared to the combined benefits of research. Analysis showed that once the California PV penetration rate reached 15%, its lack of capacity credit 10% while on the other hand, solar thermal power system with heat storage on the grid has a high degree of reliability, the capacity credit available through the power plant during a net load of 100 hours of power required to provide an estimate of the capacity. Heat storage capacity and multiple effect solar-thermal power stations and reliable energy output of the Sun. Table 1 provides a different configuration of solar thermal power system capacity credit. Configuration less than 6 hours of heat storage system of solar thermal power plants, and its low capacity credit.
Table 1 configuration capacity of solar thermal power system reliability (TES= storage system)
Compared with the variable PV output, under the 40% of renewable, solar thermal electricity systems increase the value of as much as 6 cents per kWh, as shown in Figure 2.
Figure 2 in the 33% and 40% under the renewable, solar thermal power system with heat storage and PV system’s total value, including running and capacity values (multiple SM=solar multiple Sun, 6hrs heat storage 6 hours)
Study on the analysis and other similar shows, when assessing the renewable energy technology group, must be considered with heat storage system of grid-connected solar-thermal power stations with high value, instead of just taking into account the cost of electricity (LCOE). A more comprehensive approach–the net cost assessment system, including various technical comparison of the costs and benefits of network-wide system. A net cost on behalf of adding a new tradition or annual cost of renewable energy technologies (for example, heat storage system of solar thermal power plants, photovoltaic, gas turbine, combined cycle power plant) and replacing other resources and provides similar energy level and system reliability by avoiding the cost difference between. Relative to 1500MW reliable capacity conventional gas turbine and combined cycle power plants, representing the peak, middle and base load configuration of three solar thermal power net cost of the system is shown in Figure 3. As can be seen, for the current low gas prices and the cost of carbon emissions, solar thermal power station as a peaking tend to be configured. However, costs are high in natural gas prices and carbon emissions scenario, this decision becomes less clear. In this case, each type of solar thermal power system configurations and compared to the traditional choices have a big advantage, the capacity factor for the intermediate to advanced systems will become the preferred option. The capacity factor is the actual annual energy output and the ratio of output power for a year under full load conditions.
Figure 3 lower natural gas prices and the cost of carbon emissions scenarios (pictured) and high natural gas prices and the cost of carbon emissions scenario (below) (SunShot configuration on solar thermal power net cost comparison, red line segment on the bar graph indicates SunShot-parameter float ± 10%)
Net costs are similar, as shown in Figure 4. Every technical choice offers the same reliable volume. Figure 4 shows that at current technology costs, can be considered the most expensive option is solar + gas turbines, and it is not surprising, because with thermal storage for solar thermal power generation and grid-scale batteries are relatively immature technology. When considering future costs, I believe these results vary.
Figure 4 solar thermal power generation, battery current and future PV system annual net cost of PV systems and gas turbine (solar thermal power peak, Middle load, base is in compliance with configuration and shown in Figure 3 are the same)
Original title: us releases report on the value of solar thermal power generation