Maine Gov. Janet Mills vetoed a bill that would've paused data center development. Michael Siluk/UCG/Universal Images Group/Getty Images Maine Gov. Janet Mills vetoed a bill that would have paused new data center projects until late 2027. Mills cited her support for an existing project and said she wanted to study data center impacts. Lawmakers in at least 12 states have tried and failed to ban data centers as local resistance grows. Another state-level effort to ban new data center development just failed, this time in Maine. Maine Gov. Janet Mills on Friday vetoed a bill that would have put a pause on data centers in the state until late 2027. Mills said she supports a moratorium on data center projects but that the bill, which passed the state House and Senate his month, did not include an exemption for a project already underway.…