A contentious plan to heat state office buildings in downtown Hartford with a new generation of gas-powered boilers is on hold due to potential interference from the planned reconstruction of Interstate-84, officials confirmed this week. (The state Capitol building relies on a separate system to heat and cool the 146-year-old building.) [RELATED: Plan to heat state buildings with natural gas system riles advocates]The so-called “hybrid” approach angered local community members and environmental advocates, who pushed the state to install an all-electric or geothermal heating and cooling system that would send fewer emissions into the surrounding air. However, the same report also found that those alternatives could potentially double the lifetime cost of building and operating a new gas system. She also said the agency remained open to utilizing a geothermal system, if conditions permit one.