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Continuous carbon fiber carbon-matrix (C/C) and polymer-matrix (CFRP) structural composites without poling are electrets. Their DC electric field E (hence the volumetric power density P_v for structural self-powering) increases linearly with increasing inter-electrode distance l (more significantly for C/C). Short-circuit discharge and open-circuit self-charge occur reversibly. The fraction of carriers that participate is 1.6 × 10⁻³ and 2.8 × 10⁻³ for CFRP and C/C, respectively. At l = 140 mm, E = 1.2 × 10⁻⁴ V/m, and P_v is 5.0 × 10⁻⁵ and 2.5 × 10⁻⁴ W/m³ for CFRP and C/C, respectively. The participating carrier density is 2.4 × 10²¹ and 2.6 × 10²² m⁻³, and the discharge time per unit participating charge is 6.7 × 10⁶ and 8.9 × 10⁴ s/C for CFRP and C/C, respectively. The C/C gives higher power density, whereas CFRP discharges more slowly. The polarization-induced apparent resistance increase upon DC current polarity …