Solar wind energy flux observations in the inner heliosphere: first results from Parker Solar Probe - Liu, M; Issautier, K; Meyer-Vernet, N; Moncuquet, M; Maksimovic, M; Halekas, JS; Huang, J; Griton, L; Bale, S; Bonnell, JW; Case, AW; Goetz, K; et al. (ASTRONOMY & ASTROPHYSICS, 2021)