Every wind turbine sits on a reinforced concrete foundation. When turbines reach end of service, that foundation becomes one of the biggest cost and logistics decisions in a decommissioning project.

Should it be left in place? Removed entirely? Or crushed and reused on-site?

The answer depends on regulations, landowner agreements, and future site use — but the financial impact can be significant.

How Much Concrete Is Actually There?

Large onshore wind turbine foundations commonly contain hundreds of cubic meters of concrete, often on the order of 400–500 cubic meters or 500–650 cubic yards

Exact volumes vary by turbine size, soil conditions, and engineering design. Foundations can extend several meters below grade and include substantial reinforcing steel.

That’s a large amount of material to manage across a multi-turbine project.

What Regulations Typically Require

Foundation removal requirements vary by state and by lease agreement.

Examples:

  • Texas: wind facility agreements commonly require removal of foundations to three feet below grade, with topsoil restoration.
  • Iowa (proposed legislation): some proposals call for removal to four feet below grade.
  • Project-specific agreements: many counties and land leases define their own restoration depth requirements.

In many cases, removing the top few feet of foundation meets regulatory requirements while leaving deeper concrete in place.

For agricultural land, this is often acceptable. For redevelopment or repowering, deeper foundations can become obstacles.

Full Removal vs Partial Removal

Complete excavation of a foundation is possible, but expensive. It requires:

  • Large excavators
  • Concrete breaking
  • Rebar separation
  • Haul-off or processing
  • Backfill and restoration

Costs vary widely depending on site conditions and local markets. Public estimates from past projects and studies suggest full foundation removal can add tens of thousands of dollars per turbine, and in some cases more.

Because of that, full removal is typically reserved for situations where landowners require it or redevelopment demands it or regulations mandate it.

Otherwise, developers often remove only the required upper portion and restore the site.

On-Site Crushing and Reuse

An alternative approach is to crush excavated concrete and reuse it on-site. Potential uses include access roads, sub-base material, site grading, and repower construction.

Mobile crushing equipment can process foundation concrete into usable aggregate. When reuse is coordinated with future construction, this approach can reduce hauling costs and disposal fees, as well as your purchased aggregate and, inevitably, truck traffic

However, it requires planning. 

Reuse opportunities need to be identified early, and project specifications must allow recycled material.

Planning Matters More Than the Method

Foundation disposition isn’t a decision to make during demolition. It should be evaluated 12–18 months before decommissioning begins.

Developers should:

  • Review lease agreements and state requirements
  • Evaluate future land use
  • Model removal vs reuse costs
  • Coordinate with repower EPCs if applicable
  • Specify foundation handling in RFPs

Without that planning, projects default to the simplest path: remove what’s required, haul the rest, and move on.

With planning, foundation material can often be handled more strategically — reducing cost and improving project economics.

The Bigger Picture

As more wind projects reach end of service and repowering accelerates, the industry is paying closer attention to decommissioning logistics. Foundations are one of the largest material components on site.

How they’re handled can influence:

  • Decommissioning cost
  • Site restoration
  • Repower budgets
  • Material reuse opportunities

Developers who evaluate these decisions early have more options (and often better economics) than those who wait until demolition begins.