Net Asset Value(s)

ECOFIN WATER & POWER OPPORTUNITIES PLC

It is announced that at the close of business on 15 May 2013, the un-audited Net Asset Values per Ordinary Share and ZDP Shares of the above investment trust company were:-

Share Class

NAV (p)

NAV (p)

Increase / (Decrease)

Absolute movement

(exc. undistributed revenue)

(inc. undistributed revenue)

 (inc. undistributed revenue) %

(inc. undistributed revenue) pence

Ordinary Shares

171.04

171.30

2.69

4.48

Ordinary Shares (dilutive)*

n/a

n/a

n/a

n/a

ZDP Shares

128.53

128.53

0.13

0.17

\* The Company's 6% Convertible Unsecured Loan Stock 2016 in issue will not necessarily dilute the Ordinary Shares' Net Asset Value but may do so. Where no dilution of NAV takes place the value boxes on this line will show "not applicable". A diluted NAV assumes that the 6% Convertible Unsecured Loan Stock has been converted at the conversion price of 172.6445p.

Fund Values (rounded)

£ '000

£ '000

Total Assets (less cash at bank)

551,805

Cash at Bank

1,141

Total Assets

552,946

Borrowings:

Prime Brokerage

37,108

6% CULS 2016

79,314

ZDP Shares

77,115

193,537

Net Assets (Ordinary Shareholders Funds)

359,409

Gearing (net debt/net assets) *

53.5%

Net debt is bank debt, the Convertible Unsecured Loan Stock and the Zero Dividend Preference Shares, less cash at bank

Notes:

The total assets of the Company include approximately £46.1m in bonds. Adjusted for this, the total equity exposure of the Company is 140.7% of net assets.

Phoenix Administration Services Limited

Corporate Secretary