Opinion: The Hidden Costs of ‘100 per Cent Renewable’ – by Dave McGruer and Bryan Leyland (Financial Post – February 26, 2026)

Why It Matters

Understanding the hidden backup costs is crucial for investors and policymakers assessing true ESG performance and the economic feasibility of large‑scale renewable adoption.

Key Takeaways

• Renewable procurement often excludes dispatchable backup expenses
• Grid stability demands instant power when wind or solar dip
• Backup typically relies on fossil‑gas, coal, hydro, nuclear
• Accounting tricks can mislead ESG assessments
• Unreliable grids risk outages, increasing operational costs

Pulse Analysis

Corporate renewable procurement has surged as firms chase ESG accolades and carbon‑neutral branding. Microsoft’s 100‑percent renewable claim, while headline‑worthy, rests largely on power‑purchase agreements that offset consumption on paper. This accounting approach does not alter the physics of the electric grid, where supply must match demand every second. By focusing on procurement metrics rather than actual generation mix, companies risk overstating sustainability progress and obscuring the true cost structure behind their energy strategies.

The technical backbone of any grid is dispatchable generation—power sources that can be ramped up or down instantly to balance intermittent renewables. When wind turbines lull or solar panels darken, natural‑gas peaker plants, hydro reservoirs, or nuclear reactors step in to preserve voltage and frequency. These backup resources carry capital, fuel, and operating expenses that are rarely reflected in corporate ESG reports. Emerging storage technologies, such as lithium‑ion batteries, can mitigate some reliance on fossil backup, but current cost curves and scale limitations mean that most large consumers still depend on conventional generators to avoid blackouts, as illustrated by Spain’s recent grid failure.

For investors, regulators, and sustainability officers, the hidden costs of dispatchable backup reshape the risk‑return calculus of renewable commitments. Accurate ESG scoring must incorporate the full lifecycle cost of energy, including the price of reliability and the emissions of backup fuels. Policymakers can drive transparency by mandating disclosure of ancillary services and backup capacity contracts. As the market matures, firms that integrate genuine grid‑level solutions—such as hybrid renewable‑storage‑dispatchable portfolios—will achieve more resilient, cost‑effective decarbonization than those relying solely on accounting tricks.