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We present JADES JWST/NIRSpec spectroscopy of GN-z11, the most luminous candidate z > 10 Lyman break galaxy in the GOODS-North field with M UV = −21.5. We derive a redshift of z = 10.603 (lower than previous determinations) based on multiple emission lines in our low and medium resolution spectra over 0.8 − 5.3 µm. We significantly detect the continuum and measure a blue rest-UV spectral slope of β = −2.4. Remarkably, we see spatially-extended Lyman-α in emission (despite the highly-neutral IGM expected at this early epoch), offset 555 km s −1 redward of the systemic redshift. From our measurements of collisionally-excited lines of both low-and high-ionization (including [O ii] λ3727, [Ne iii] λ3869 and C iii] λ1909) we infer a high ionization parameter (log U ∼ −2). We detect the rarely-seen N iv] λ1486 and N iii] λ1748 lines in both our low and medium resolution spectra, with other high ionization lines seen in low resolution spectrum such as He ii (blended with O iii]) and C iv (with a possible P-Cygni profile). Based on the observed rest-UV line ratios, we cannot conclusively rule out photoionization from AGN. The high C iii]/He ii ratios, however, suggest a likely star-formation explanation. If the observed emission lines are powered by star formation, then the strong N iii] λ1748 observed may imply an unusually high N/O abundance. Balmer emission lines (Hγ, Hδ) are also detected, and if powered by star formation rather than an AGN we infer a star formation rate of ∼ 20 − 30 M yr −1 (depending on the IMF) and low dust attenuation. Our NIRSpec spectroscopy confirms that GN-z11 is a remarkable galaxy with extreme properties seen 430 Myr after the Big Bang.

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The project team are very grateful to many individuals and organisations for their invaluable support for this project. First and foremost we are indebted to those individuals who, despite their complex circumstances and often stressful daily lives, spared the time to participate in the citizens panel exercise and to recount difficult experiences to the team. We are hugely grateful for you time, your insights and your ideas about how experiences of energy advice could be improved. We are also very grateful to all those who participated in our Stakeholder Reference Group. This provided a vital sounding board throughout the project and ensured that the project remained sensitive to policy and practice. Thank you for your enthusiasm and for your many excellent ideas about how experiences for hard to reach energy users can be improved. We are also very grateful to Dan Wostenholme and Remi Bec for their support and for facilitating a lively and productive final stakeholder workshop. We also acknowledge the vital financial support provided the Higher Education Innovation Fund (HEIF) and for the in-kind support provided to the project by Sheffield Hallam University and Citizens Advice. research will provides important insight into how we must go about engaging with this policy challengehearing the voices of to deliver authentic, practical solutions to benefit all consumers.