The promise of a “Green New Deal” has electrified US politics, but it has largely remained a loose set of goals rather than a defined list of policies: until now.

On Thursday morning, US Representative Alexandria Ocasio-Cortez of New York and Senator Ed Markey of Massachusetts, both Democrats, put forth a framework that finally elucidates at least some of the environmental package’s more concrete proposals.

Much of it was expected. It spells out the authors’ ambitions to slash greenhouse-gas emissions from agriculture, construction, energy, and transportation. It also mandates modernizing the grid and fortifying cities against climate disasters.

What’s more interesting is that the new framework finally provides new details on the mix of technologies that could be employed to accomplish these goals, addressing a hot-button issue that energy and environmental groups have already been vigorously debating (see “Let’s keep the Green New Deal grounded in science”).

Here are four key takeaways.

#1: Clean, not renewable

For some, the concern had been that the proposal would limit energy generation to renewable sources alone, mainly wind and solar, as hundreds of environmental groups had advocated.

Instead, the package adopts a relatively technology-agnostic approach to how we clean up the power sector, stating that the nation must meet “100 percent of the power demand in the United States through clean, renewable, and zero-emission energy sources.”

That seems to allow for the use of carbon-free sources like nuclear power and fossil-fuel plants with carbon-capture systems. Most energy researchers argue that such steady carbon-free sources will make it faster, easier, and less expensive to overhaul the energy system. That’s because wind and solar generation fluctuates wildly, which requires expensive forms of energy storage or transmission, in the absence of other consistent sources.

#2: No new nukes?

That said, at least one of the authors obviously wants to rapidly eliminate nuclear power and fossil-fuels plants.

An early version of an accompanying FAQ, released this morning from Ocasio-Cortez’s office, stated that the plan wouldn’t include any new nuclear plants, adding: “It’s unclear if we will be able to decommission every nuclear plant within 10 years, but the plan is to transition off of nuclear and fossil fuels as soon as possible.”

The nuclear language didn’t appear in a later draft, though. (Update: Still later, the FAQ disappeared from the site.)

“Although a fact sheet from one of the resolution’s sponsors has created confusion, the text of the actual resolution makes it abundantly clear—we must embrace every zero-carbon resource available to eliminate climate pollution and dramatically increase our investment in clean energy innovation,” said Josh Freed, senior vice president at Third Way, a clean-energy think tank, in a statement.