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  BiMBy Power Company, LLC

Our Mission

To build large porous medium pressure vessels using mine overburden/waste rock/tailings to serve as renewable energy storage reservoirs for compressed gas. The gas stored in the reservoirs may be compressed air which has a low energy density by volume, or a clean burning gas such as H2 which has a high energy density by volume. We refer to a single device containing such a porous medium pressure vessel as a BiMBy, for Big Mass Battery.


The BiMBy Device

A familiar home compressed air storage system is compared to a BiMBy pressure vessel in Fig. 1: porous waste rock is encapsulated by a liner forming a pressure vessel and overlain by additional waste rock forming a pressurizing layer; a compressor pumps air into the pressure vessel via air in piping when renewable energy source (wind or solar power) is available; compressed air is released via air out piping to run a turbine to generate electricity upon demand. This beneficial use of mine waste rock adds economic value to the waste rock, is potentially transformative for the mining and renewable energy economies, and could positively affect regulatory acceptance by offering alternative reclamation options.

                         Home                                                                 BiMBy

Fig. 1. A home compressed air energy storage system (left) compared to a BiMBy device (right).


Company History

BiMBy Power Company, LLC (BPC) was organized in Nevada in December 2015. During the 2015-2016 academic year, BPC enlisted student engineers from Harvey Mudd College to study the lifting and lowering of mine waste rock using a variable volume pressure vessel. BPC settled upon a fixed volume, porous medium pressure vessel (US Patent Pending). Work to date has so far affirmed the feasibility of constructing BiMBy pressure vessels using materials on hand at most mine sites, materials such as relatively impermeable bedrock and silt/clay earthen materials and relatively permeable sand/pebble/boulder earthen materials. To prove, demonstrate, and advance its technology, BPC is presently seeking to build a Proof-of-Concept BiMBy device, preferably at an active mine site where costs are lowest and learning opportunities greatest.


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Yerington Pit, Anaconda Mine (inactive open-pit metal mine), Yerington, NV from Weed Heights looking east (R. Donelick, 9 August 2016).