Geothermal System Credit Proposal Sparks Debate Among Energy Advisors

The recent SBCC WSEC-R TAG Meeting held on July 11, 2025, brought to light significant discussions regarding energy efficiency in geothermal heating systems, particularly in relation to domestic hot water heating. The meeting highlighted a proposal for new credit points aimed at incentivizing the use of geothermal heat pumps in residential settings.

Larry, a representative from a geothermal company, advocated for a credit system that rewards homeowners who utilize a two-tank system for heating water with geothermal energy. He argued that this method is more efficient, especially during the summer months when excess heat from cooling systems can be redirected to heat water, effectively providing "free hot water." Larry proposed one credit point for a single tank system and two points for a dual tank system, emphasizing that the latter maximizes the efficiency of the geothermal system.

The discussion revealed a divide among council members regarding the value of these proposed credits. Some members, like Dwayne, expressed concerns about offering too many credits for systems that already receive recognition for being Energy Star rated. Others, like Dave, acknowledged the potential benefits of the two-tank system but questioned whether it warranted the full two points proposed.

The council also discussed the existing credit structure, which currently allows for one point for systems that utilize ground source heat pumps for heating water. The debate centered on whether the proposed two-tank system should receive additional credit or if the existing framework sufficiently covers the energy savings achieved through geothermal heating.

As the meeting progressed, members considered the implications of these credits on energy efficiency goals and the potential financial burden on homeowners who might need to invest in additional equipment. The conversation underscored the importance of balancing incentives for energy-efficient systems with the need to maintain a fair and manageable credit system.

In conclusion, the meeting set the stage for further exploration of how to effectively integrate geothermal heating systems into Washington's energy efficiency framework. The discussions will likely influence future policies aimed at promoting sustainable energy practices, ultimately benefiting residents through reduced energy costs and increased reliance on renewable energy sources. The council plans to revisit these proposals in upcoming sessions, aiming to refine the credit system to better serve both the environment and the community.