Maroš Šefcovic told a summit organised by lobby group SolarPower Europe in Brussels that he would be the sector's "ally around the negotiations table" and push for continued support for the cleantech industry in the post-2020 multiannual financial framework.
"We must continue strengthening the industrial basis for renewable energy in Europe," he said.
"Major global economies are following us, turning their economy more sustainable for the benefit of all the planet's inhabitants," he said.
In the face of increasing competition, the vice president said, the EU would continue "setting a solid regulatory framework" to support renewables, creating stability for investors.
Proposals in the clean energy package would prepare the market for decentralised production and incentivise demand, he said.
The post-2020 renewable energy directive, currently being negotiated by MEPs and member states, could promote self consumption and other new business models, he added.
Šefcovic said that the European Battery Alliance, launched in October 2017 with EU funding to establish a competitive manufacturing chain, would adopt an action plan in early May as part of the third mobility package.
The commission, he added, was also encouraging member states to "expedite" work on national energy and climate plans for 2030 to "re-establish renewable energy investors' confidence".