The research in my PhD aims to use statistical methodology such as the spectral representation of time series within multivariate changepoint detection methods. My research is conducted in collaboration with Shell Global Solutions. My project is supervised by Dr. Idris Eckley at Lancaster University and Dr. Philip Jonathan at Shell, and is linked to the EPSRC-funded 'Locally Stationary Energy Time Series (LETS)' programme, which is joint between Lancaster and Bristol universities.