# Table 3 Explanatory variables used in the model estimation for testing the hypotheses

Hypotheses Explanatory statements Coding for analysis
H1—in comparison to other RES, there is no additional WTP for energy from biogas “Food or fuel”: green electricity is only trustworthy if no plants which could alternatively be consumed as food or feed are used for its generation Effect coded: 1 = agreement; -1 = disagreement
H2a/b—the participant’s WTP for a green electricity tariff is dependent on the region and the town size in which they live “Region: east, south, west, north”: In which of the following regions do you live?
“Town size”: How many people live in the place (village, town, city) of your primary residence?
Effect coded: 1 = east, south, west; -1 = north
1 =  < 5,000 residents
2 = 5,000–19,999 residents
3 = 20,000–99,999 residents
4 = 100,000–499,999 residents
5 =  ≥ 500,000 residents
H3—the willingness to switch to a green electricity tariff depends on the acceptance of the EEG levy.a) “EEG levy acceptance”: The EEG levy of costs to all citizens is a good instrument to promote the expansion of renewable energies Effect coded:
1 = agreement; -1 = disagreement
H4—an environmentally conscious way of life leads to a higher WTP for green electricity “Green Party identification”: I feel best represented by the political platform of the Green Party
“Environment is important when buying groceries”: I consider environmental concerns when I buy my groceries for the week
Effect coded: 1 = agreement; -1 = disagreement
Effect coded: 1 = agreement; -1 = disagreement
H5—the number of tariff switches would increase if consumers could outsource the switching process to someone else “Never switched before”: Have you ever actively (not moving) switched your electricity tariff?
“Wish to outsource switching process”: I would be more motivated to switch if there was somebody who could do this for me for a fixed fee of 50 Euros
Effect coded: 1 = yes; -1 = no
Effect coded: 1 = agreement; -1 = disagreement
1. Source: author’s elaboration; translated from German