Anti-fracking campaigners are expected to stage a demonstration outside a public inquiry in Cheshire.
Energy company IGas wants to carry out tests for shale gas in Ellesmere Port but was refused permission by Cheshire West and Chester Council in January last year.
The site is near the banks of the River Mersey, south of the Vauxhall car plant and north of Stanlow.
The company appealed the decision and now the matter's going to be heard before a public inquiry which begins today at Chester Town Hall.
IGas has previously said the tests are 'routine' but the opponents claim it will lead to full-scale drilling.
Anti-fracking groups say they'll be joined by local residents for the protest ahead of the start of the inquiry.
Friends of the Earth says the public Inquiry is significant for the future of shale gas development in the North West.