1. A system, comprising: a converter that converts power information into metadata and sends the metadata over a power transmission line with electricity transmitted over the power transmission line to a plurality of different recipient customers of the electricity, wherein the power information describes a current rate cost of the electricity that is charged by a provider offering the electricity; and a plurality of signal decoders that are each accessible by the recipient customers and that collect the metadata from the power transmission line, decode the collected metadata into the power information, and present the current rate cost of the electricity and a duration of time that the rate costs will be available to the recipient customers of the electricity by: offering a first tier plurality of the recipient customers the electricity at the current rate cost for a first time period during the duration of time; if capacity is still available within a maximum capacity of the electricity provider after expiration of the first time period, offering a different, second tier plurality of the recipient customers the electricity at the current rate cost for another, second time period during the duration of time; and if capacity is still available within the maximum capacity of the electricity provider after expiration of the second time period, offering the current rate cost to a remainder of the plurality of the recipient customers for a remainder of the duration of time.