Last month, Portugal produced more than enough renewable energy to meet the country's entire electrical demand - a feat unmatched in the last 40 years," according to the Portuguese Renewable Energy Association, or APREN. Renewable power produced in March was equal to 103.6 percent of electrical demand on mainland Portugal. Fifty-five percent of that energy was produced through hydro power, while 42 percent came from wind. The country still used fossil fuels to balance out supply and demand. "These periods were nevertheless fully compensated by others of greater renewable production," [APREN writes]. "It is expected that by 2040 the production of renewable electricity will be able to guarantee, in a cost-effective way, the total annual electricity consumption of Mainland Portugal." For most countries in the world, a fully renewable energy supply still seems like a challenging target. Portugal has made substantial investments in renewable energy sources, as has its neighbor Spain. Some of that spending was cut in 2012, amid austerity measures, and more were scaled back in 2016. But by that point, many renewable energy projects had already been paid off and were operating cost-efficiently. And this week, coincidentally, the Portuguese government put a stop to another energy subsidy - one "worth about 20 million euros a year, most of which goes to fossil fuel plants," Reuters writes.