We'll need to consider all power options to meet growing demand

For most of the last 10 years, electric consumption in Washington has been relatively flat or even falling. Innovative technologies like LED lighting and heat pumps have been replacing less efficient incandescent lighting and the older generation of HVAC systems. Moderate weather, on average, in both winter and summer has also flattened electric loads. Some Washington utilities have been concerned that falling demand would affect their ability maintain their systems without substantial rate ­increases.

However, electric consumption is rising again. Relevant factors include, but are not limited...