Rosebud Mine, Colstrip, MT.

k/b equivalent to 1 m of dry concrete

Retains 96% of gas pressure after 15 h storage.

Pressure Vessel

V = 3.5 x 10⁷ m³

A = 2.9 x 10⁶ m²

M = 6.1 x 10⁷ t

P  = 4.3 x 10⁵ Pa

Pressurizing Layer

V_PL = 3.9 x 10⁷ m³

A_PL = 3.3 x 10⁶ m²

M_PL = 6.9 x 10⁷ t

Whole Device

V_T = 7.4 x 10⁷ m³

A_map = 1.6 x 10⁶ m²

M_T = 1.3 x 10⁸ t

Assume

ρ = 1.75 t∙m^-3

ϕ = 0.3 scalar

Energy Storage Capacity

CAES     9.0 x 10⁵ kW∙h      0.03% of US need

H₂           1.4 x 10⁷ kW∙h      0.47% of US need

Tesla Powerwalls (13.5 kW∙h at $5500 each)

CAES      67k at $366M

H₂            1.1M at $5.8B

photo: http://billingsgazette.com/news/state-and-regional/montana/rosebud-county-to-reap-million-in-protested-taxes-after-state/article_97128908-6e9b-505a-8019-ae62d0de6910.html, Larry Mayer

This information is provided as an intellectual exercise and is not meant to imply endorsement by any company or community.