Besides riding the railway, or ‘tube,’ to go from one end of the U.K. to another, some North Londoners will benefit from excess heat generated by the Northern Line by year’s end with a new initiative to reuse this heat to warm hundreds of houses and businesses in Islington.

The plan, which is already underway, uses inexpensive, low-carbon heat or “waste heat” produced by the railway to pump into hundreds of Islington homes. Around 700 homes in the city currently use heat created in the Bunhill Energy Centre, which makes electricity. Another 450 homes are expected to use heat from the railway this winter.

Related: Britain celebrates first week without coal power since 1882

The Greater London Authority has reported that about 38 percent of heating demands in the city could be met through waste heat. Utilizing alternative options of renewable heat has become increasingly important after the U.K. government’s decision to ban gas-fired boilers from newly built homes by 2025.

Tim Rotheray, director of the Association for Decentralized Energy, told The Guardian that heat from the railway as well as other heating plans are gaining steam across the country as low-cost options in fighting climate change.

“Almost half the energy used in the U.K. is for heat, and a third of U.K. emissions are from heating,” Rotheray said. “With the government declaring that we must be carbon-neutral within 30 years, we need to find a way to take the carbon out of our heating system. The opportunity that has become clear to the decentralized energy community is the idea of capturing waste heat and putting it to use locally.”

Besides the railway, other heat sources are coming from some unusual places throughout the country. For example, take a sugar factory in Wissington, Norfolk that uses extra heat made from cooking syrup and pumps it into a greenhouse used to grow medical cannabis.

According to The Guardian, another source of heat being considered in towns and cities is geothermal energy that is trapped in water at the bottom of old mines. In Edinburgh, engineers have created a heat network using pooled water at one mine as a large, underground thermal battery. The city council of Stoke-on-Trent, England estimates its geothermal energy project could reduce carbon emissions by 12,000 tons annually.

Via The Guardian

Image via Axel Rouvin