System and method for facilitating building net energy consumption reduction with the aid of a digital computer

A system for facilitating implementation of building net energy consumption reduction with the aid of a digital computer, comprising:

• remotely interfacing by a computer, the computer comprising a processor and memory within which code for execution by the processor is stored, to an at least one meter that monitors electricity provided to a building from an external source over a set time period and obtaining by the computer data regarding the provided electricity from the meter;
• obtaining by the computer data for space heating consumption that is representative of energy consumed to heat the building over the set time period;
• obtaining by the computer data for water heating consumption by a natural gas water heater that is representative of energy consumed to heat water for the building over the set time period;
• normalize by the computer the provided electricity, space heating, and water heating consumption into units of energy that are the same and combine the normalized data for the provided electricity, space heating, and water heating consumption into total energy consumption for the building;
• modeling by the computer a change to the total energy consumption based on a replacement of the natural gas water heater by a heat pump water heater;
• and
• modeling by the computer on-site photovoltaic power generation system sufficient to meet at least a portion of the changed total energy consumption for the building, wherein the natural gas water heater is replaced with the heat pump and the photovoltaic power generation system is installed at the building based on the modeling.