The evidence is piling up that when the real value of energy is considered, electricity generated from concentrating solar power (CSP) plants with storage capability outperforms solar photovoltaic (PV) and wind power.  
Rigorous research studies cited throughout The Economic and Reliability Benefits of CSP With Thermal Energy Storage: Recent Studies and Research Needs, a report from the CSP Alliance, show that the services derived from CSP with storage add value not only to CSP, but to PV and wind as well.
This may be intuitively obvious, but a grid operator responsible for keeping the lights on and aware that the lights failing would be a career-defining moment will prefer this study to intuition. Cited studies from NREL, LBNL, and others document added energy value and capacity value from CSP with storage.
“When comparing CSP with thermal energy storage to alternative renewable technologies (including CSP without storage),” the CSP Alliance summary of studies said, “there are several primary categories of additional benefits provided by thermal energy storage, as well as lower system integration costs when compared to other variable energy resources.”
The benefits of a renewable energy plant can be quantified, the assessment argued, by a metric that measures the total economic value of each benefit per year divided by the total energy output from the plant in dollars or euros per megawatt-hour. The sum of these values allows for calculation of the net system cost, which is the sum of the costs minus the sum of the benefits. The net system cost required for a given level of output, operational performance, and reliability provides a basis for comparing energy sources, the report said.