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Yes, it is possible to set a decimal field to zero using render_template with Flask WTForms. You can set a decimal field to zero by setting its value to 0.0 or by using the Decimal function provided by the decimal module in Python. Here is an example:

from flask import Flask, render_template
from wtforms import Form, DecimalField
from decimal import Decimal

app = Flask(__name__)

class MyForm(Form):
    decimal_field = DecimalField()

@app.route('/', methods=['GET', 'POST'])
def index():
    form = MyForm()
    if form.validate_on_submit():
        # Process form data
        pass
    form.decimal_field.data = Decimal('0.0')  # Set the value to zero
    # OR
    # form.decimal_field.data = 0.0  # Set the value to zero
    return render_template('index.html', form=form)

if __name__ == '__main__':
    app.run(debug=True)

In the above example, we have created a form with a decimal field called decimal_field. We have set its value to zero using the Decimal function. Alternatively, we could have set its value to 0.0 directly. We then pass the form to the render_template function along with the name of the template file (index.html). In the template, we can render the form field using form.decimal_field.