Solar for All by 2030? Climate Leaders Say It's Ambitious but Achievable

Three prominent climate figures—author Bill McKibben, former UN climate secretary Christiana Figueres, and Canada's ex-environment minister Catherine McKenna—have signed an open letter calling for a global mobilization around solar power. Their target is stark: universal access to clean, affordable electricity by 2030, reaching the nearly one billion people who currently have no reliable power and the billions more paying inflated prices for fossil fuels. With just over three years remaining in the decade, the question is whether this push amounts to visionary ambition or wishful thinking.

The case for optimism rests on recent momentum. Solar capacity expanded by a record 30 percent in 2025 alone, and the technology has grown more than tenfold since 2015. For the first time in a century, renewable energy sources surpassed coal in the global electricity mix last year. McKenna, who now runs the climate advisory firm Climate and Nature Solutions, frames solar as the cheapest electricity ever produced. "It is scaling way faster than anyone ever imagined," she told Deutsche Welle. Battery technology for storing excess renewable energy has followed a similar cost trajectory, dropping sharply alongside solar modules themselves. The financial and technical pieces, according to Eicke Weber—a physicist and former director of Germany's Fraunhofer Institute for Solar Energy Systems—are already in place. "We have the technologies available and we have enough money to finance it," he said.

Yet the scale required is enormous. The world currently has 3 terawatts of installed solar capacity and produces roughly 1 terawatt of new capacity annually, with China leading production. To fully transition global energy supply to renewables, Weber estimates the world would need about 50 terawatts. The gap is real but not insurmountable—Weber notes that existing production capacity already exceeds current sales. The human dimension is equally stark: roughly 655 million people lack electricity access, with Sub-Saharan Africa's electrification pace needing to triple to achieve universal coverage by 2030. McKenna sees opportunity in this gap. Regions without power infrastructure can leapfrog directly into clean technology, bypassing the fossil fuel infrastructure that has locked in emissions elsewhere. "There's a misunderstanding, which is often propagated intentionally by fossil fuel companies, that it's expensive, it's hard, it's unreliable," she said. "That just isn't the case anymore."

Hans-Josef Fell, the German politician who drafted his country's Renewable Energy Sources Act in the early 2000s, knows something about shattering expert consensus. That legislation established feed-in tariffs that catalyzed exponential growth in clean energy, overturning projections that policymakers had considered realistic. Now heading the think tank Energy Watch Group, Fell argues the 2030 goal is achievable—but only with political will that is "currently lacking around the world because public debate is dominated by fossil fuel interests." His calculations suggest that if renewables met all global energy demand, solar would supply roughly 60 to 70 percent, with wind, bioenergy, and hydropower making up the remainder.

Weber offers a more cautious timeline. While Germany could theoretically achieve such a transition in two or three years with sufficient political backing, a global shift would likely require until 2040 to reach 80 to 90 percent renewable electricity. "It is possible to achieve this, but it would require a very kind of moonshot program," he said, emphasizing the need for serious political commitment. Fell's framing is more flexible: "If we as a global society tackle this properly, we might actually be able to make it happen. And even if we achieve only 90% of that goal, it would still be a remarkable accomplishment."

McKenna has called for blended finance—money from governments, the World Bank, the African Development Bank, and the private sector working in concert. She frames the choice starkly: continuing with fossil fuels is irrational on costs, risks, and climate impacts alike. "That's an old technology," she said. Countries like China and Pakistan have already begun pushing ahead. The question now is whether the rest of the world can match their pace, or whether the 2030 deadline will slip into a longer, still-urgent timeline.