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We present a detailed analysis of the X-ray emission of HS 1700+6416, a highredshift (z=2.7348), luminous quasar, classified as a Narrow Absorption Line(NAL) quasar on the basis of its SDSS spectrum. The source has been observed 9times by Chandra and once by XMM from 2000 to 2007. Long term variability isclearly detected, between the observations, in the 2-10 keV flux varying by afactor of three (~3-9x10^-14 erg s^-1 cm^-2) and in the amount of neutralabsorption (Nh < 10^22 cm^-2 in 2000 and 2002 and Nh=4.4+-1.2x10^22 cm^-2 in2007). Most interestingly, one broad absorption feature is clearly detected at10.3+-0.7 keV (rest frame) in the 2000 Chandra observation, while two similarfeatures, at 8.9+-0.4 and at 12.5+-0.7 keV, are visible when the 8 contiguousChandra observations of 2007 are stacked together. In the XMM observation of2002, strongly affected by background flares, there is a hint for a similarfeature at 8.0+-0.3 keV. We interpreted these features as absorption lines froma high velocity, highly ionized (i.e. Fe XXV, FeXXVI) outflowing gas. In thisscenario, the outflow velocities inferred are in the range v=0.12-0.59c. Toreproduce the observed features, the gas must have high column density(Nh>3x10^23 cm^-2), high ionization parameter (log(xi)>3.3 erg cm s^-1) and alarge range of velocities (Delta V~10^4 km s^-1). This Absorption Line QSO isthe fourth high-z quasar displaying X-ray signatures of variable, high velocityoutflows, and among these, is the only one non-lensed. A rough estimate of theminimum kinetic energy carried by the wind of up to 18% L(bol), based on abiconical geometry of the wind, implies that the amount of energy injected inthe outflow environment is large enough to produce effective mechanicalfeedback.

HS 1700+6416: the first high redshift non lensed NAL-QSO showing variable high velocity outflows