Manhay Deep Geothermal Power Project

Manhay is a hamlet situated on the A394 between Penryn and Helston, and lies within the parish of Wendron. The parish stretches from the outskirts of Helston in the south, to Four Lanes in the north, encompassing the villages of Rame, Porkellis and Trevenen Bal. 

The site location was selected for its geology, easy access from a major A road and a viable connection to the national grid for both importing and exporting electricity at the site. Furthermore, the land is not in a conservation area, has no other restrictions and is close to industry and new housing estates in Helston which could utilise the power and heat directly from the site.

Planning permission was granted by Cornwall Council for the Manhay Deep Geothermal Power Project in February 2023, after almost eighteen months of consideration and amendments. Work has now started on detailed preparation, to meet the required planning conditions and ensure each stage of the project runs smoothly. Once ground works are able to start, it is anticipated to take around three years for the site to reach electricity generation.

More information will be available as site work progresses but in the meantime, if you have any questions about the project, please email:

Manhay OS map
The approximate red line area of the Manhay site (base map source: Ordnance Survey)

Project Timeline

Manhay Site Acquisition

The site was selected for the excellent geology, its proximity to a major A road, a viable connection to the grid and because it is not situated within any designated conservation areas.

Planning Application Under Consideration

An application for planning permission at the Manhay site was submitted in October 2021. A number of comments and suggestions were made by planning consultees and the public over the following year and our plans were updated to better suit the site location and reduce the impact of development on the local community. These changes resulted in the application being recommended for approval by the planning officer in February 2023. 

September 2021
Planning Permission Achieved

Planning permission was granted by the Strategic Planning Committee of Cornwall Council in February 2023. A number of conditions need to be met prior to any work starting on site.

February 2023

Project Overview

Below you will find a selection of slides that provide an overview of the project including why the site was chosen, what to expect during development and operation, and how the site will be managed to ensure good environmental and social governance. 

To view the slides, please click on the first image below and navigate using the arrows at either side of the screen.

If you have any questions about the Manhay Deep Geothermal Power project, please get in touch via email to or visit the Contact Us page on our website.