Understand your light bill.

A cycle lasts from the beginning of a month to the end of a month. For example, if it is May 2025 now, the price of a unit will reset on June 2025.

There is a monthly fee of
$$2.13$$
So, there's a spending of GHS2.13 to get 0 units.

A maximum of 30 units could be bought for a price of GHS0.8150877 each before you will have to upgrade your account.

So, when 30 units are bought at a price of GHS0.8150877 each,
$$2.13 \\ +\,(30 \times 0.8150877)\\ = 26.582631$$
So, there's a spending of GHS26.582631 to get 30 units.

To buy more units, you will have to upgrade your account from Lifeline to Other for the month, for a fee of GHS39.5486595.
$$2.13 \\ +\,(30 \times 0.8150877) \\ +\,39.5486595\\ = 66.1312905$$
So, there's a spending of GHS66.1312905 to get 30 units, if an account with 30 units were to somehow be upgraded anyway.

After buying 30 units, a maximum of 270 units can be bought for GHS1.84668015 each. For example, if 300 units are bought,
$$2.13 \\ +\,(30 \times 0.8150877) \\ +\,39.5486595 \\ +\,(270 \times 1.84668015)\\ = 564.734931$$
So, there's a spending of GHS564.734931 to get 300 units.

If you need any more units, each unit will be sold at a price of GHS2.4400866 each.

From July 1st 2025 on,

there is a monthly fee of
$$2.13$$
So, there's a spending of GHS2.13 to get 0 units.

A maximum of 30 units could be bought for a price of GHS0.8350734 each before you will have to upgrade your account.

So, when 30 units are bought at a price of GHS0.8350734 each,
$$2.13 \\ +\,(30 \times 0.8350734)\\ = 27.182202$$
So, there's a spending of GHS27.182202 to get 30 units.

To buy more units, you will have to upgrade your account from Lifeline to Other for the month, for a fee of GHS40.3074945.
$$2.13 \\ +\,(30 \times 0.8350734) \\ +\,40.3074945\\ = 67.4896965$$
So, there's a spending of GHS67.4896965 to get 30 units, if an account with 30 units were to somehow be upgraded anyway.

After buying 30 units, a maximum of 270 units can be bought for GHS1.89196035 each. For example, if 300 units are bought,
$$2.13 \\ +\,(30 \times 0.8350734) \\ +\,40.3074945 \\ +\,(270 \times 1.89196035)\\ = 578.318991$$
So, there's a spending of GHS578.318991 to get 300 units.

If you need any more units, each unit will be sold at a price of GHS2.49991665 each.

It is possible to buy 0.1 units.