She is the party's spokesperson for climate, energy, economic affairs, mining, and aviation.

[1] She previously served as a Member of Parliament for the Christian Democratic Appeal from 2019 to 2021.

[2] In 2023, she was appointed acting chair of the Infrastructure and Water Management Committee.

At Postma's urging, State Secretary Jurgen Nobel promised to extend a scheme reimbursing energy costs for low-income households, established in response to the global energy crisis, into 2025.

However, Nobel failed to reach an agreement with energy suppliers and civil society organizations about its funding.