It depends on your roof size, your consumption pattern and your current tariff, so we do not publish a single percentage. What we can commit to is the shape of it: the rate you pay us is agreed in the contract and sits below your grid tariff from the first invoice, and it stays fixed while utility tariffs move. We will give you a year-by-year projection against your own bills before you sign anything.

None. The site assessment and the proposal are free and carry no obligation. If the numbers do not work for you, that is the end of it.

Under a Lease, the system transfers to you at no cost and every unit it produces after that is free. Under a PPA, the options are to extend the agreement, arrange transfer of the system, or have us remove it and restore the roof — all set out in the contract before you sign, not negotiated at the end.

The agreement is tied to the site, so it can be transferred to the incoming owner or occupier, who inherits electricity below the grid rate. If that is not possible, the contract sets out a defined buy-out. Tell us early and we will work through it with you.

Three Eight Six owns it, and the asset sits on our balance sheet rather than yours. That is what removes the capital decision — you are buying power, not equipment.

We do, for the entire term and at our cost: monitoring, cleaning, inverter servicing, repairs, insurance and warranty claims. Your facilities team has nothing new to manage. Because we are paid on what the plant generates, keeping it running is our problem, not yours.

Under a PPA you are billed on metered output, so if the system underproduces, you simply pay less — the shortfall is our loss, not your risk. Every plant is monitored remotely and output is reported to you, so the figure on the invoice can always be traced back to the meter.

No system goes up until a qualified structural engineer certifies the roof can carry it, and the report is shared with you. Mounting methods are chosen to suit your roof type, and where a roof warranty is in place we work with the original supplier so it stays intact.