The transition to renewable energy is vital for achieving long-term climate goals and ensuring sustainable, domestic energy security. However, renewable energy markets are highly sensitive to macro-level political and regulatory conditions, with shifts in policy and governance influencing investor confidence and capital allocation into renewable energy projects and infrastructure. Existing literature has investigated the role of policy incentives in promoting or hindering the adoption of renewable energy; however, less is understood regarding how broader economic policy uncertainty affects financial performance at the firm level. Consequently, this thesis examines whether higher national economic policy uncertainty, as measured using the Baker-Bloom-Davis Economic Policy Uncertainty (EPU) Index, reduces the monthly stock returns of 15 publicly traded U.S. renewable energy firms over the last two decades, from 1984 to 2024. Panel regression analysis with R is employed to analyze monthly stock market returns of renewable energy firms while controlling for investor sentiment with the Chicago Board Options Exchange's CBOE Volatility Index (VIX), overall market performance based on the S&P 500, and firm-specific traits. This approach isolates the effect of national economic policy uncertainty on firm stock performance. As such, the findings illuminate how governance volatility and stability shape investor confidence, firm valuation, and capital allocation, clarifying how policy environments can accelerate renewable energy project development and support the sector’s sustainable growth within America’s contemporary political economy.