As power systems transition towards low-carbon generation, the reliance on variable renewable energy sources introduces uncertainty in supply. To maintain reliability, flexible technologies capable of rapid ramp-up, referred to as agile technologies, are increasingly important. This study explores the economic and environmental implications of integrating such technologies into the portfolio of a profit-maximising renewable energy producer. A stylised model in which the producer commits to a supply contract before observing renewable output is developed. After production is realised, any supply shortfall is covered using agile technology or procured from expensive short-term markets. However, while agile technologies offer operational flexibility, they may be associated with significant greenhouse gas emissions, particularly when life-cycle impacts from material extraction or disposal are considered. Using a range of realistic scenarios, the results show that the expected total emissions could be smaller if the focal producer owns a smartly chosen portfolio of renewable and agile technology compared to when they own no agile technology. More importantly, it is shown that, even if such an agile technology has a higher emission rate than every other plant in the system, it could still be environmentally prudent for a renewable producer to own that agile technology. The findings suggest that renewable-agile portfolios can offer both economic and environmental gains, encouraging policymakers to adopt this approach even when LCA or some level of direct emissions exist.
