Describes the challenge utilities meet to maintain a balance between energy consumption and the amount of power being generated. If not, a system imbalance can occur which causes electrical equipment and industrial processes to malfunction, lights to flicker, and can cause damage to sensitive electrical equipment – all of which are things that society cannot tolerate. If the imbalance is significant enough the entire electric grid can fail causing black outs. More and more utilities are using a combination of conventional generation produced by sources such as natural gas, coal, and nuclear, and renewable sources such as wind, solar, and geo-thermal to achieve this balance.

Base Load Generation

Power generation plants that operate continuously throughout the year, except for periodic maintenance or upgrading, to meet the majority of customer demand. Utilities traditionally use fossil-fuel generation (natural gas, coal, nuclear) to meet the base level of energy demand because of its reliability.

The baseload they produce is “The average amount of electric power that a utility company must supply at a given time.” (PG&E)


This is a category of sources for power generation derived from biomass (crops like corn) or waste feedstocks (think manure). An example is ethanol. Another is biodiesel which is “A fuel made from vegetable oils, animal fats or recycled grease that can be used instead of petroleum-derived fuel.” (PG&E)