For years, the climate investment conversation was framed around the energy transition. That was the right framing for a long time. It helped investors recognize that decarbonization would require private capital at scale to build new infrastructure and industrial capacity.
But the politics and economics of the moment have shifted. The most compelling climate argument today may be less about climate itself and more about the cost, reliability and availability of energy. This is where the climate case and the affordability case converge.
People experience the energy transition in practical terms. Households feel it through bills, outages, jobs, air quality and whether the systems around them work. Businesses feel it through power availability, supply-chain risk and the cost of operating in a more constrained world. Communities feel it through the infrastructure built near them, the jobs it creates and the tradeoffs they are asked to accept.
For impact investors, economic needs now reinforce climate considerations. Power generation, transmission, grid modernization, industrial decarbonization and domestic manufacturing have moved from niche climate themes to essential economic infrastructure. Climate investing is more durable when it is tied directly to affordability, reliability and economic competitiveness.
That is the argument we make in our recent report, “Capital at Scale: Rebuilding the Physical Economy.” The economy is running into physical constraints. Demand for power, industrial capacity and resilient supply chains is growing faster than the systems designed to support that demand.
For two decades, the smartest capital chased asset-light businesses. Software scales without factories. Platforms grow without permits. But the next phase of the economy may look different. The mismatch between rapidly rising power requirements and slowly expanding infrastructure is creating one of the defining capital opportunities of the coming decade: the rebuilding of the physical economy.
Where the opportunity is
AI is making the gap impossible to ignore. Data centers are putting new pressure on power markets, utilities and regulators. The strain already has a price tag. In PJM — the grid serving 67 million people from Illinois to the mid-Atlantic — capacity prices jumped roughly ninefold in a single auction and have stayed near their regulatory ceiling since. In the most recent auction, PJM’s independent market monitor attributed about 40% of the costs to data-center demand. Utilities expect the increase to add 1.5% to 5% to customer bills.
The strain is also showing up across the economy: Electrification, reshoring, grid modernization and supply-chain resilience all depend on real assets, long timelines and operational execution.
The opportunity spans multiple sectors – transmission infrastructure needed to move power to load centers, industrial technologies that reduce emissions while lowering costs, domestic manufacturing platforms that strengthen supply chains, and critical materials businesses that support electrification and energy security.
For impact investors, the opportunity extends beyond financing climate solutions themselves to financing the infrastructure and industrial systems required to deploy them at scale. Investing in infrastructure may be harder than financing companies with individual climate solutions, but it may also be more useful for investors trying to connect impact with economic value.
The affordability test
Affordability is increasingly the test that determines which solutions can scale.
Energy is the clearest example. If cleaner power is more expensive, less reliable or harder to access, public support becomes harder to sustain. If it is cheaper, more resilient and tied to domestic capacity, the coalition can widen. In that sense, climate objectives are increasingly aligning with economic priorities such as affordability, resilience and domestic competitiveness.
Across the physical economy, the most compelling investment opportunities may be those where impact and economic value reinforce each other. For example, a domestic manufacturing project can strengthen supply chains, reduce industrial emissions, create high-quality jobs and improve economic resilience.
Grid modernization offers another clear example. Expanding transmission can lower congestion costs, improve reliability, unlock cleaner generation and support economic growth. SunZia makes the point concretely. The 550-mile high-voltage line that reached commercial operation in 2026 carries about 3,000 megawatts of New Mexico wind to markets in Arizona and California — an $11 billion investment that unlocked the largest wind project in the Western Hemisphere and enough generation for roughly a million homes.
Shaping the buildout
Physical infrastructure can solve real problems, but it can also create new community and environmental risks. Permitting, siting, water use, community impact and labor quality all matter. The question is how to shape the buildout responsibly.
That may be the central opportunity now. The rebuilding of the physical economy gives impact investors a chance to influence how essential infrastructure is financed, built and governed.
The next decade will require expanded power supply, greater industrial capacity and more resilient supply chains. These systems will be built, one way or another. The defining question is whether they are built in ways that are cleaner, more reliable, more affordable and more accountable to the communities they serve.
Access the full paper, “Capital at Scale: Rebuilding the Physical Economy,” here.
Jonathan Siegel is a partner at Altes Capital and the managing partner of Altes Ascent, the firm’s impact investing division. Brian Altenburg is a managing partner and co-portfolio manager at Altes Capital. Garvin Jabusch is chief investment officer at Green Alpha Investments. Erika Karp is president of Green Alpha Investments.
Guest posts on ImpactAlpha represent the opinions of their authors and do not necessarily reflect the views of ImpactAlpha.
