NOVELTY - The method involves determining a power supply from an alternative energy source (108). An excess portion of the power supply is stored from the alternative energy source in a rechargeable energy storage device (110) without releasing electrical power from the energy source to a power grid (106) when the excess portion from the alternative energy source is less than rechargeable energy storage device's maximum capacity in accordance with determination that the power supply from the energy source exceeds a power load from an electrical power consumption entity (104) during time period.    USE - Method for regulating an alternative energy source e.g. photovoltaic power source, fuel cell power source, hydro-electric power source, geo-thermal power source, wind turbine, diesel generator and albedo source, decoupled from a power grid at an electrical power consumption entity e.g. waste-water treatment plant, town, building such as single-family house, city, compound, school, university campus, penitentiary and jail (all claimed). Can also be used for a solar park, geyser and a biomass plant, and for a condominium, city library, town hall, computer, heater, air-conditioner, home appliance, industrial equipment, light and an automatic door.    ADVANTAGE - The method enables a reverse power relay that is a directional power relay that monitors power flow between the power grid and the alternative energy source and prevents reverse power condition in which power flows from alternative energy source into the power grid, while avoiding continuously generating excessive amount power, which can cause electrical failure to the consumption entity or to the alternative energy source and providing relief during power shortage.    DETAILED DESCRIPTION - The rechargeable energy storage device is a lithium iron phosphate battery. INDEPENDENT CLAIMS are also included for the following:    (1) a computer system    (2) a non-transitory computer-readable storage medium comprising a set of instructions for regulating alternative energy source decoupled from a power grid.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of a power system.    System for regulating alternative energy source decoupled from power grid (100)    Electrical power consumption entity (104)    Power grid (106)    Alternative energy source (108)    Rechargeable energy storage device (110)    Supply determination module (112)    Decision engine (114)