In 2017, Hydroplan conducted a Due Diligence assessment of two hydropower projects in Yorkshire on behalf of Triodos Bank. The Thrybergh scheme (260kW) is on the River Don near Rotherham and has been operational since September 2015, and the Kirkthorpe scheme (500kW) on the River Calder near Wakefield has been operating since December 2016. Both schemes are low head. The assessment included the following elements:

• Site visit and inspection of the stations.
• Assessment of the quality of construction and the condition of the stations.
• Comparison of predicted AAEP with actual performance since commissioning.
• Review of turbine and station performance.
• Review of current O&M costs.
• Review of future maintenance, repairs and renewals budgets.
• Report providing a summary of the above and recommendations.

Following receipt of this assessment, the Bank then released funds for a further scheme at Knottingley on the River Aire, which Hydroplan inspected for due diligence for the client during construction. This scheme has an installed capacity of 500kW and sells the electricity directly to a paper mill on the opposite bank of the river. All three projects were developed by Barn Energy Ltd.