When a company reduces water usage and increases the use of more expensive resources due to more stringent regulations, this directly impacts its operating expenditure (OPEX). Here's a detailed breakdown:

Regulatory Compliance:

As regulations become stricter, companies often need to adopt new technologies or practices that may be more costly. This increase in cost is directly related to the day-to-day operations of the company, affecting operating expenditures.

For example, implementing water-saving technologies or switching to sustainable raw materials that are more expensive than traditional ones will raise the ongoing costs associated with production​​.

Impact on Revenues:

While reducing water usage and adhering to stricter regulations can have long-term benefits for the company, such as improved sustainability ratings and possibly higher market valuation, these changes do not typically have an immediate direct impact on revenues. Revenues are more directly influenced by sales and market demand​​.

Impact on Provisions:

Provisions are set aside for future liabilities or losses, such as environmental remediation costs or legal disputes. While stricter regulations might eventually lead to increased provisions, the immediate impact of switching to more expensive resources affects operating expenditure first​​.

CFA ESG Investing References:

The CFA ESG Investing curriculum highlights the importance of understanding how regulatory changes can affect various aspects of a company's financials. Operating expenditure is often highlighted as the most immediately impacted area when companies adapt their operations to comply with new environmental standards​​.