Regulators are tightening rules around data centers amid concerns about energy, water use and cost. Meanwhile, solar is edging past coal in the US power mix, signaling a shift with broad implications. This page answers the most common questions readers ask about these developments and what to watch in the year ahead.
Regulators are acting to curb higher electricity and water use, land-use impacts, and cost pressures from rapid data-center expansion. The burden tends to fall on a mix of developers, utility customers, and local communities, with costs shifting through electricity rates, permitting fees, and water-management requirements.
May data show solar provided more electricity than coal for the first time, marking a pivot in the energy mix. For consumers, this could mean lower prices during sunny periods and more price volatility as solar share grows, depending on storage, grid investments, and policy support.
Policymakers could accelerate the transition with stronger federal guardrails, incentives for clean energy deployment, and streamlined permitting. Hindrances might include support for incumbent fuels, regulatory delays, or water and land-use constraints that slow project approvals.
Beyond electricity, data centers raise concerns about water consumption, land use, and local climate impacts. Regulators and communities are weighing these trade-offs against the economic benefits of jobs and digital infrastructure.
If solar remains on its growth trajectory, coal's role will likely shrink further, with natural gas serving as a bridge. The long-term mix will depend on storage, transmission expansion, and policy frameworks that support reliability and affordability.
Key signals include new state and federal regulations on energy efficiency, water use, and land permits for facilities; updates to grid standards; and emissions or tax policies that incentivize or deter large-scale data-center or solar investments.
If all data centers permitted through 2025 come online, they will use more than all the electricity used by any one US state in 2024, except Texas.
The findings, supported by a report from the Solar Energy Industries Association and Wood Mackenzie, highlight solar’s continued growth and coal’s ongoing decline