Households and businesses in Jersey will now be able to sign up for 1Gb broadband deals with two separate service providers.
Government-owned Jersey Telecom (JT) has been replacing the island's copper-based networks with fibre, and is already offering ultra-fast broadband services to residents.
As reported by the BBC, JT has now agreed a wholesale contract with Sure Jersey, enabling the provider to offer rival broadband services via the fibre network.
With the States of Jersey part-funding the Gigabit Jersey project, JT was under a requirement to open the infrastructure up for use by other operators.
However, Graham Hughes, Chief Executive of Sure Jersey, expressed disappointment that it had taken 18 months to reach a wholesale agreement.
"Sure has remained committed to securing fair and equitable access to Jersey's fibre network, because it is the only way to provide all islanders with genuine competition and choice in broadband services," he stated.
Andrew Riseley, from the Channel Islands Competition Regulatory Authority, told the news provider that it had been "a difficult negotiation".
"We are pleased that there will be options available for customers in the provision of fibre broadband, and that the roll-out process can be undertaken in a more efficient manner," he stated.