The phrase "temperature steam" refers to steam at a specific level of heat. It means the steam is neither too hot nor too cold, but at the right temperature. Full definition
Solar power towers generate power the same way as traditional power plants — by creating high temperature steam to turn a turbine. (brightsourceenergy.com)
Apparently, only a couple of cashew producers use a technique that doesn't involve high temperature steaming. (golubkakitchen.com)
Zhang, X., O'Brien, J. E., Zhou, C. Housley, G., and Tao, G., Experimental Design, Operation, and Results of a 4 kW High Temperature Steam Electrolysis Unit,» Journal of Power Sources, Vol. (h2awsm.org)