The Countries Winning at Renewable Energy and the Secret They Don't Advertise

Denmark, Portugal, and Uruguay are running on near-100% renewable electricity. Here is the specific policy mix and grid management that made this possible — and what others aren't copying.

The countries that have achieved the highest renewable energy penetration in their electricity systems share specific characteristics that together explain their success — and that are notably absent from the policy portfolios of countries struggling with the transition.

Denmark provides 55-60 percent of its electricity from wind power and is advancing toward 100 percent renewable. The specific factors: a consistent, long-term policy framework for wind development maintained through multiple government changes, which provided the investment certainty that wind project developers required; strong interconnection with neighbouring countries (Norway, Sweden, Germany) that allows Denmark to import when wind is low and export when it's high; a district heating infrastructure that allows excess renewable electricity to be used for heat storage, providing a form of energy storage that electricity batteries can't match at comparable cost.

Portugal exceeded 70 percent renewable electricity in 2025 — a remarkable achievement for a country with limited hydroelectric resources relative to its renewable electricity share. The key enablers: an aggressively expanded solar programme whose Portuguese sunshine resource provides solar generation complementary to wind in seasonal and daily patterns; demand response programmes that shift industrial and commercial electricity demand toward periods of high renewable generation; and the specific interconnection with Spain that allows solar-heavy Portugal to exchange with less-solar-intensive northern European markets.

Uruguay's near-100 percent renewable electricity — achieved on a national scale in a developing country with a population of 3.5 million — is the demonstration case that renewable energy transition is not exclusively a wealthy country story. Uruguay's approach involved: long-term renewable energy contracts awarded through competitive auctions that provided certainty at lowest cost; public investment in grid infrastructure that preceded renewable capacity to ensure connection quality; and a pragmatic acceptance of some wind curtailment as preferable to the cost of storage that would eliminate it.

The secret these countries don't advertise: policy consistency matters more than policy perfection. Countries that have changed their renewable energy policy frameworks frequently — retroactively reducing feed-in tariffs, introducing planning barriers after commitments were made — consistently show worse renewable energy performance than countries whose policy frameworks are less optimal in design but more stable in implementation.